C Programming Quiz: Variable Names, Output, Constants, sizeof()

C Variable Names

• myVariable and variable123 are valid variable names
• 123variable is not a valid variable name (numbers cannot start a variable name)
• _variable is a valid variable name

C Output

• printf("%d", x++); outputs 5 (post-increment x++ returns the original value of x)

Declaring Constants in C

• const int CONSTANT = 10; is the correct way to declare a constant in C

sizeof() Operator

• The sizeof() operator returns the size of a type or variable in bytes

Division in C

• The result of the expression 3 / 2 in C is 1 (integer division truncates the decimal part)

Logical Operators in C

• || is a logical operator in C (logical OR)

Array Declaration in C

• int array[10]; is the syntax to declare an array in C with 10 elements

scanf() Function

• The scanf() function reads formatted input from the standard input

Terminating a C Program

• return 0; is the correct way to terminate a C program

Conditional Operator

• x > y ? x : y returns x if x is greater than y, and y otherwise

Header Files in C

• stdio.h is the header file required for input and output operations in C

break Statement

• The purpose of the break statement in a loop is to terminate the loop

for Loop Syntax

• The correct syntax for the for loop in C is for (int i = 0; i < 10; i++)

while Loop Output

• The output of the code while (i < 5) { printf("%d ", i); i += 2; } is 0 2 4

String Declaration in C

• char str[] = "Hello"; and char *str = "Hello"; are valid ways to declare a string in C
• char str = "Hello"; and string str = "Hello"; are not valid ways to declare a string in C

if Statement

• The output of the code if (x = 6) printf("True"); else printf("False"); is True (assignment x = 6 has a non-zero value, which is considered true)

continue Statement

• The purpose of the continue statement in a loop is to skip the remaining code in the loop and proceed to the next iteration

Array Access

• arr is a pointer to the first element of the array, so printf("%d", arr); prints the memory address of the first element (garbage value)

do-while Loop

• The loop body of a do-while loop is executed at least once before the condition is evaluated

Prefix Increment Operator

• The prefix increment operator ++i increments i before returning its value, so printf("%d", ++i); outputs 11

Array Access

• nums[3] is the correct way to access the fourth element of an array named nums

& Operator

• The & operator is an address of operator, which returns the memory address of a variable

for Loop Output

• The output of the code for (; i < 5; i++) { printf("%d ", i); } is 0 1 2 3 4

Function Definition in C

• The correct way to define a function in C that returns an integer and takes two parameters a and b is int functionName(int a, int b) { }

strcmp() Function

• The strcmp() function compares two strings, returning a negative value if the first string is less than the second, zero if they are equal, and a positive value if the first string is greater than the second.

Test your knowledge of C programming with this quiz! Identify valid variable names, predict the output of code snippets, determine the correct way to declare constants, and understand the purpose of the sizeof() operator.