History of C Programming Language

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Questions and Answers

Who proposed the C language at Bell Laboratories in 1972?

  • Dennis M. Ritchie (correct)
  • Ken Thompson
  • Martin Richard
  • Brian Kernighan

Which programming language is most frequently associated with UNIX?

  • C (correct)
  • Java
  • Python
  • HTML

What was one of C's earlier forms before it evolved from BCPL?

  • HTML
  • Java
  • Python
  • The B language (correct)

Which book, published in 1978, was the first book on C programming?

<p>The C Programming Language by Brian Kernighan and Dennis Ritchie (C)</p> Signup and view all the answers

What was the goal of the ANSI committee established in 1983 regarding the C language?

<p>Produce an unambiguous and machine independent definition of the language C (A)</p> Signup and view all the answers

What comes after local declarations in the main function?

<p>Statements (B)</p> Signup and view all the answers

What is the purpose of a return function in a program?

<p>To return a value when specified (B)</p> Signup and view all the answers

Which file type is NOT generated during the compilation process of a C program?

<p>.txt (C)</p> Signup and view all the answers

What does the Linker do in the compilation process of a C program?

<p>Link object files to library functions (C)</p> Signup and view all the answers

Which component stores the address of the next instructions to be executed by the CPU?

<p>Program Counter (C)</p> Signup and view all the answers

What is the purpose of the 'ceil()' function in C Math?

<p>Rounds up the given number to the nearest integer (C)</p> Signup and view all the answers

Which keyword in C language is used to define a loop?

<p>Break (D)</p> Signup and view all the answers

What is the purpose of identifiers in C programming?

<p>Name variables and other program elements (A)</p> Signup and view all the answers

Why is it important to declare variables in C programming?

<p>To inform the compiler about variable data types (B)</p> Signup and view all the answers

What is the purpose of the 'pow()' function in C Math?

<p>Returns the power of a given number (B)</p> Signup and view all the answers

What is the range of the 'Short int' basic data type in 'C'?

<p>-32768 to 32767 (B)</p> Signup and view all the answers

Which data type is used in 'C' to store a set of data values?

<p>Arrays (A)</p> Signup and view all the answers

How are string constants represented in 'C'?

<p>As a sequence of zero or more characters surrounded by double quotes (D)</p> Signup and view all the answers

Which constant type is used to associate constant values with names in 'C'?

<p>Enumeration constant (D)</p> Signup and view all the answers

What is the main purpose of declaring an unsigned constant in 'C'?

<p>To increase the range of storage (B)</p> Signup and view all the answers

What is the purpose of the preprocessor section in a C program?

<p>Include necessary header files (A)</p> Signup and view all the answers

Which organization established the ANSI C standard?

<p>ANSI (A)</p> Signup and view all the answers

What is the significance of the main() function in a C program?

<p>Is the first function executed by the computer (C)</p> Signup and view all the answers

What is a key feature of C programming that makes it highly portable?

<p>Code written in one machine can be moved to another (C)</p> Signup and view all the answers

Which section of a C program usually includes declarations for global variables?

<p>Preprocessor section (C)</p> Signup and view all the answers

What is a variable in C used for?

<p>To store data (A)</p> Signup and view all the answers

Which of the following rules for defining variables in C is correct?

<p>Variable names must not be reserved words or keywords (C)</p> Signup and view all the answers

What type of variable must be initialized before it is used?

<p>Local variable (D)</p> Signup and view all the answers

Which storage class in C retains its value between multiple function calls?

<p>Static (D)</p> Signup and view all the answers

What happens to the memory assigned to automatic variables upon exiting a block in C?

<p>Memory is automatically freed (A)</p> Signup and view all the answers

What will be printed when the first code snippet is executed?

<p>garbage garbage garbage (D)</p> Signup and view all the answers

Which type of variables can hold their value between multiple function calls?

<p>Static (A)</p> Signup and view all the answers

What is not allowed for register variables while using the & operator?

<p>Dereferencing (B)</p> Signup and view all the answers

Which storage class should be used for variables intended to be stored in the CPU registers?

<p>Register (B)</p> Signup and view all the answers

What does the external storage class signify in C programming?

<p>Variable declared elsewhere in the program (A)</p> Signup and view all the answers

What happens when a static global variable is declared?

<p>Memory allocation happens at compile time (B)</p> Signup and view all the answers

Who proposed the C language at Bell Laboratories in 1972?

<p>Dennis Ritchie (A)</p> Signup and view all the answers

What was the original programming language that C evolved from?

<p>BCPL (A)</p> Signup and view all the answers

Which book marked the first publication on C programming in 1978?

<p>The C Programming Language (A)</p> Signup and view all the answers

What is the primary reason for the association between C programming language and UNIX?

<p>Bulk of UNIX and applications written in C (C)</p> Signup and view all the answers

Which characteristic of C programming contributes to its high portability?

<p>Isolation of machine-specific features within a few modules (C)</p> Signup and view all the answers

What is the purpose of the 'return' function in C programming?

<p>To return a value and end the execution of a function (D)</p> Signup and view all the answers

What happens when a C program file is compiled without any errors?

<p>It generates an executable '.obj' file (C)</p> Signup and view all the answers

What is the function of the Loader in a C program execution process?

<p>It informs the CPU about the starting point of the loaded program (D)</p> Signup and view all the answers

What is the role of the Linker in the compilation process of a C program?

<p>Generates the final executable file by linking object files and library functions (C)</p> Signup and view all the answers

Which file extension is used for an intermediate file generated during the compilation process of a C program?

<p>'.obj' (C)</p> Signup and view all the answers

What is the purpose of using the 'scanf' function in C programming?

<p>To read input from the user (B)</p> Signup and view all the answers

Which function in C can be used to find the power of a given number?

<p>pow() (A)</p> Signup and view all the answers

What is the significance of declaring variables before using them in C programming?

<p>To allocate storage space (B)</p> Signup and view all the answers

Which of the following functions in C returns the square root of a given number?

<p>sqrt() (B)</p> Signup and view all the answers

In C programming, what is the main purpose of using the 'pow()' function?

<p>To calculate the power of a number (B)</p> Signup and view all the answers

What is the significance of the 'main()' function in a C program?

<p>It is the first function executed by the computer (D)</p> Signup and view all the answers

Why is it important to declare variables in C programming?

<p>To ensure that a variable exists before it's used (B)</p> Signup and view all the answers

What is the primary purpose of the preprocessor section in a C program?

<p>To include header files in the program (C)</p> Signup and view all the answers

Which section of a C program includes declarations for global variables?

<p>Global declaration section (C)</p> Signup and view all the answers

What does the 'define' section in a C program typically comprise of?

<p>Global constants declared using the define keyword (B)</p> Signup and view all the answers

What is the visibility of global variables in C programming?

<p>Available to all functions (A)</p> Signup and view all the answers

Which keyword is used to define static variables in C?

<p>static (A)</p> Signup and view all the answers

What is the default value assigned to automatic variables in C?

<p>Garbage value (C)</p> Signup and view all the answers

Which storage class in C has the shortest lifetime?

<p>Automatic (B)</p> Signup and view all the answers

What is the main difference between global and external variables in C?

<p>The memory location (A)</p> Signup and view all the answers

What is the purpose of 'typedef' in 'C' programming?

<p>To create new data type names defined by the user (B)</p> Signup and view all the answers

Which escape sequence is used for a new line in 'C' character constants?

<p>\n (D)</p> Signup and view all the answers

What is the range of values for an 'Unsigned int' basic data type in 'C'?

<p>0 to 4,294,967,295 (B)</p> Signup and view all the answers

What is the importance of declaring an unsigned constant in 'C'?

<p>To increase the range of storage (D)</p> Signup and view all the answers

Which data type should be used in 'C' to store a set of data values?

<p>Arrays and Structures (A)</p> Signup and view all the answers

What is a key feature of static variables in C programming?

<p>Hold their value between multiple function calls (D)</p> Signup and view all the answers

Which storage class in C allows variables to be stored in CPU registers?

<p>Register (C)</p> Signup and view all the answers

What is the default initial value of external variables in C?

<p>0 (D)</p> Signup and view all the answers

When using the 'extern' storage class, what does the compiler expect?

<p>External linkage elsewhere (C)</p> Signup and view all the answers

What is a limitation of register variables in C?

<p>&amp; operator can be used on them (B)</p> Signup and view all the answers

Which statement accurately describes the visibility of static global variables in C?

<p>Accessible from any file within the program (C)</p> Signup and view all the answers

What differentiates automatic variables from static variables in C?

<p>Automatic variables are not initialized by default (D)</p> Signup and view all the answers

Which keyword is used to define a variable that should be stored in CPU registers?

<p>'register' (B)</p> Signup and view all the answers

'extern' storage class is primarily used to declare variables with what kind of linkage?

<p>external (D)</p> Signup and view all the answers

What is a common characteristic of all register variables in C?

<p>Faster access time (A)</p> Signup and view all the answers

What was the main goal of the American National Standards Institute (ANSI) committee that was established in 1983 in relation to the C programming language?

<p>To develop a machine-independent definition of the language C (B)</p> Signup and view all the answers

Which computer system was one of the first portable operating systems due to the fact that the C language does not directly rely on specific hardware architecture?

<p>UNIX OS (C)</p> Signup and view all the answers

Who wrote the book 'The C Programming Language' which was first published in 1978?

<p>Ken Thompson and Brian Kernighan (D)</p> Signup and view all the answers

Which early form of the C language was written by Ken Thompson for the DEC PDP-7 computer?

<p>B language (A)</p> Signup and view all the answers

Which individual designed C programming for use with UNIX on DEC PDP-11 computers?

<p>Dennis Ritchie (C)</p> Signup and view all the answers

What is the purpose of the Loader in the C program execution process?

<p>Loads the executable file in RAM and informs the CPU with the starting point (A)</p> Signup and view all the answers

In C programming, what is the role of the Linker in the compilation process?

<p>Links object files to library functions (A)</p> Signup and view all the answers

Which section of a C program includes user-defined functions like color(), sum(), and division()?

<p>Program Execution (D)</p> Signup and view all the answers

What happens when a C program file is compiled without any errors?

<p>It saves the file as a .obj file of the same name (D)</p> Signup and view all the answers

Which of the following statements accurately describes expressions in C programming?

<p>Expressions are formulas linking operands with operators (B)</p> Signup and view all the answers

Which section of a C program includes declarations for global variables?

<p>Global declaration (D)</p> Signup and view all the answers

What is the purpose of the 'pow()' function in C Math?

<p>Returning the power of a given number (C)</p> Signup and view all the answers

What is the primary difference between local and global variables in C programming?

<p>Local variables are defined within functions, while global variables are declared outside functions (A)</p> Signup and view all the answers

What is the main purpose of using the 'typedef' keyword in C programming?

<p>Renaming data types (C)</p> Signup and view all the answers

Which keyword is used to define a variable that should be stored in CPU registers?

<p>register (A)</p> Signup and view all the answers

Which feature contributes to the high portability of C programming language?

<p>Availability of multiple data types (A)</p> Signup and view all the answers

What is a common characteristic of all static variables in C programming?

<p>They retain their value between function calls (D)</p> Signup and view all the answers

What does the 'define' section in a C program typically comprise of?

<p>Constant declarations (B)</p> Signup and view all the answers

Which storage class in C retains its value between multiple function calls?

<p>Static (D)</p> Signup and view all the answers

What is the purpose of the Linker in the compilation process of a C program?

<p>Resolving references to functions defined in other files (D)</p> Signup and view all the answers

Which keyword is used in C to declare a variable that retains its value between multiple function calls?

<p>static (C)</p> Signup and view all the answers

In C programming, where should a global variable typically be declared to make it accessible to all functions?

<p>Outside any function or block (D)</p> Signup and view all the answers

What is the default value assigned to automatic variables in C?

<p>Garbage Value (B)</p> Signup and view all the answers

Which storage class in C has the shortest lifetime, limited to the block in which it is defined?

<p>Auto (A)</p> Signup and view all the answers

What happens to the memory assigned to automatic variables upon exiting from the block in which they are defined?

<p>Memory is deallocated immediately (A)</p> Signup and view all the answers

What is the storage size of a 'Char' basic data type in C?

<p>8 bits (C)</p> Signup and view all the answers

In C programming, what is the value range of an 'Unsigned long' basic data type?

<p>0 to 4,294,967,295 (C)</p> Signup and view all the answers

Which data type in C is used for creating new data type names defined by the user?

<p>Typedef (C)</p> Signup and view all the answers

In C programming, what does the suffix 'f' or 'F' indicate when used with floating point constants?

<p>Float constant (D)</p> Signup and view all the answers

What is the numerical value of the character constant 'a' in a C program?

<p>'a' (C)</p> Signup and view all the answers

What is a key feature of static variables in C?

<p>Their value persists between multiple function calls (A)</p> Signup and view all the answers

What is a limitation of register variables in C?

<p>They cannot be dereferenced (D)</p> Signup and view all the answers

Which storage class in C retains its value between multiple function calls?

<p>Static (A)</p> Signup and view all the answers

What is the default initial value of external integral type variables in C?

<p>0 (C)</p> Signup and view all the answers

What does the 'extern' storage class indicate about a variable in C?

<p>The variable is declared with an external linkage elsewhere (D)</p> Signup and view all the answers

Which statement accurately describes the visibility of static global variables in C?

<p>Limited to the file they are declared in (D)</p> Signup and view all the answers

What was the original name of the language C before it evolved further?

<p>B language (B)</p> Signup and view all the answers

Which computer was the C language first designed for by Dennis Ritchie?

<p>DEC PDP-7 (C)</p> Signup and view all the answers

What is one of the key characteristics of UNIX operating system code written in C?

<p>Highly adaptable to different hardware architectures (D)</p> Signup and view all the answers

Who co-authored the first book on C programming published in 1978 along with Dennis Ritchie?

<p>Brian Kernighan (D)</p> Signup and view all the answers

What is one of the main reasons why UNIX was one of the first portable operating systems?

<p>Isolation of machine-specific features within the kernel (D)</p> Signup and view all the answers

What is the primary purpose of defining the 'define' section in a C program?

<p>Define constants using the define keyword (C)</p> Signup and view all the answers

Which section of a C program is responsible for including header files?

<p>Preprocessor section (C)</p> Signup and view all the answers

What is the purpose of the 'main()' function in a C program?

<p>Starting point of execution (B)</p> Signup and view all the answers

Which part of the C program contains all the global declarations?

<p>Global declaration (A)</p> Signup and view all the answers

What type of memory is assigned to automatic variables in C?

<p>Stack memory (D)</p> Signup and view all the answers

Which component in a C program is responsible for linking the object files to library functions?

<p>Linker (A)</p> Signup and view all the answers

What is the purpose of the 'return' function in C programming?

<p>To end the execution of a function (A)</p> Signup and view all the answers

What file extension is given to an object file generated by the C compiler?

<p>.obj (B)</p> Signup and view all the answers

In the context of C programming, what is the significance of declaring variables before using them?

<p>It informs the compiler about variable types (A)</p> Signup and view all the answers

What is the role of the Loader in the execution of a C program?

<p>Load the object file into RAM (B)</p> Signup and view all the answers

What type of operations can be performed using the 'pow()' function in C Math?

<p>Calculate and return the power of a given number (D)</p> Signup and view all the answers

How does the 'ceil()' function in C Math differ from the 'floor()' function?

<p>ceil() rounds up the given number, while floor() rounds down (B)</p> Signup and view all the answers

What does the 'int_amt' variable store in the INTEREST CALCULATIONS program?

<p>Result of multiplying principle and rate of interest (C)</p> Signup and view all the answers

What is the key difference between Keywords and Identifiers in C programming?

<p>Keywords are reserved words with predefined meaning, while Identifiers are names for variables and program elements (B)</p> Signup and view all the answers

In C programming, what is a common characteristic of all register variables?

<p>They are stored in CPU registers for faster access (B)</p> Signup and view all the answers

What is the range of the 'Float' basic data type in 'C'?

<p>3.4<em>10E-38 to 3.4</em>10E38 (A)</p> Signup and view all the answers

Which escape sequence in 'C' represents a Carriage return?

<p>\r (A)</p> Signup and view all the answers

What is the purpose of the 'typedef' keyword in 'C' programming?

<p>To create new data type names defined by the user (B)</p> Signup and view all the answers

Which constant type is used to increase the range of storage in 'C'?

<p>Unsigned constants (A)</p> Signup and view all the answers

In C programming, what is the significance of declaring an unsigned constant?

<p>To increase the range of storage (C)</p> Signup and view all the answers

Which type of variable retains its value between multiple function calls in C programming?

<p>Static variable (A)</p> Signup and view all the answers

What is the default visibility scope of automatic variables in C programming?

<p>Block scope (D)</p> Signup and view all the answers

In C programming, what is the primary reason for initializing local variables before use?

<p>To ensure predictable behavior (A)</p> Signup and view all the answers

Which storage class in C has memory allocated automatically at runtime?

<p>Automatic (A)</p> Signup and view all the answers

What happens to the memory assigned to automatic variables upon exiting from the block in C programming?

<p>It is freed up for reuse (B)</p> Signup and view all the answers

What is the primary reason for using the 'static' keyword with variables in C?

<p>To retain the value of the variable between multiple function calls (A)</p> Signup and view all the answers

Which storage class in C provides faster access time compared to automatic variables?

<p>Register (B)</p> Signup and view all the answers

What happens when a static global variable is declared in a C program?

<p>It retains its value between multiple function calls (D)</p> Signup and view all the answers

Which of the following is true about external variables in C?

<p>They are only declared to have external linkage elsewhere (C)</p> Signup and view all the answers

Why can't static variables be stored in CPU registers?

<p>Only one storage specifier can be used for a variable (A)</p> Signup and view all the answers

What is a key feature of register variables in C?

<p>The compiler allocates memory into CPU registers for them (B)</p> Signup and view all the answers

Which keyword is used to define a variable that retains its value between multiple function calls?

<p>__static (A)</p> Signup and view all the answers

What does the 'extern' storage class indicate in C?

<p>It is intended to specify that the variable is declared elsewhere in the program (C)</p> Signup and view all the answers

When a variable is declared as 'register' in C, why can't pointers be stored in the register?

<p>'register' variables cannot hold addresses (B)</p> Signup and view all the answers

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