CSE101: Intro to C Programming

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Questions and Answers

Which of the following best describes the primary purpose of 'storage classes' in C programming?

  • To define new data types for variables.
  • To perform mathematical calculations.
  • To manage input and output operations.
  • To determine the scope, visibility, and lifetime of variables and functions. (correct)

Given that ptr is a pointer in C, which operation would correctly deallocate the memory block ptr points to, preventing memory leaks?

  • `free(ptr);` (correct)
  • `ptr = NULL;`
  • `realloc(ptr, 0);`
  • `calloc(ptr, 0);`

What is the primary difference between passing an argument 'by value' versus 'by reference' to a function in C?

  • There is no difference; both methods achieve the same result in C.
  • Passing by value is used for simple data types, while passing by reference is used for complex data structures.
  • Passing by value creates a copy of the variable, while passing by reference allows the function to directly modify the original variable. (correct)
  • Passing by value allows modification of the original variable, while passing by reference only allows reading the variable's value.

When should you use the realloc() function in C?

<p>To change the size of a previously allocated memory block. (C)</p>
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Which of the following statements regarding the use of pointers and arrays in C is most accurate?

<p>An array name can be treated as a constant pointer to the first element of the array. (A)</p>
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What is the significance of the void pointer type in C?

<p>It is a generic pointer that can point to any data type. (C)</p>
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Consider a scenario where you need to store elements of different data types (e.g., int, float, char) under a single name. Which C construct is most suitable for this purpose?

<p>Union (B)</p>
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Which control structure is most appropriate for executing a block of code at least once, and then repeating the execution based on a condition?

<p><code>do-while</code> loop (C)</p>
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What is the purpose of a function prototype in C?

<p>To declare the function's return type, name, and parameters before its actual definition. (A)</p>
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Given the following code snippet, int arr[5] = {10, 20, 30, 40, 50}; int *ptr = arr;, what value will *(ptr + 2) evaluate to?

<p>30 (D)</p>
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Flashcards

Algorithm

A step-by-step procedure for solving a problem.

Flow Chart

A diagram that uses symbols and lines to represent the steps of an algorithm.

Keywords in C

These are reserved words that have predefined meanings and cannot be used as identifiers.

Variable

A named location in memory that stores a value.

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Constant

A value that cannot be changed during program execution.

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Arithmetic Operators

Operators that perform mathematical calculations.

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If, If Else statements

Conditional statements that execute specific blocks of code based on whether a condition evaluates to true or false.

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While Loop

A loop that executes a block of code repeatedly as long as a condition is true.

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Break Statement

Keyword to exit a loop prematurely.

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Function

A block of code designed to perform a specific task.

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Study Notes

  • CSE101: Computer Programming, worth 3 credits, involves 2 hours of lectures and 2 hours of practical work per week
  • Students will be able to solve problems through C programming
  • Students will learn to write programs using standard language conventions
  • Students will discuss the mechanisms of code reusability by creating their own function libraries
  • Students will learn use of pointers with functions and implementation of basic data structures

Unit I: Basics and Introduction to C

  • Program development in C will be covered
  • Structured programming will be done using algorithms and flow charts
  • The C character set, identifiers, keywords, data types, constants, and variables will be studied
  • Includes expressions, arithmetic, unary, relational, logical, assignment, conditional and bitwise operators

Unit II: Control Structures and Input/Output Functions

  • Includes If, If else, Switch case statements, While, For and Do-while loops
  • Also includes Break and continue statements, Goto, Return
  • Type conversion and type modifiers form part of the curriculum
  • Includes designing structured programs in C
  • Formatted and unformatted Input/Output functions like printf(), scanf(), puts(), gets() will be touched on

Unit III: User Defined Functions and Storage Classes

  • Function prototypes and definitions will be covered
  • Function calls including passing arguments by value and by reference will be practiced
  • Math library functions and recursive functions are also included
  • Coverage scope rules (local and global scope)
  • Storage classes in C namely auto, extern, register and static storage classes.

Unit IV: Arrays in C

  • Declaring and initializing arrays in C
  • Defining and processing one and two dimensional arrays
  • Including array applications and passing arrays to functions
  • Inserting and deleting elements of an array
  • Searching (linear and binary search methods) and sorting using bubble sort

Unit V: Pointers, Dynamic Memory Allocation and Strings

  • Pointer declaration and initialization is covered
  • Pointer types include dangling, wild, null, generic (void)
  • Coverage of pointer expressions, arithmetic and operators
  • Passing a pointer to a function and a one dimensional array
  • Dynamic memory management functions like malloc, calloc, realloc and free
  • Defining and initializing strings and reading/writing strings
  • Processing of strings, character arithmetic and string manipulation functions

Unit VI: Derived Types Including Structures and Unions

  • Declaration of a structure, definition and initialization of structures
  • Accessing structures, including structures and pointers
  • Nested structures, declaration of a union, definition and initialization of unions

Text Books

  • Programming in C by Ashok N. Kamthane, Pearson Education India

References

  • Programming in ANSI C by E. Balagurusamy, Tata McGraw Hill, India
  • C How to Program by Paul Deitel and Harvey Deitel, Pearson Education India

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