C Programming Quiz

Which of the following is a valid variable declaration in C?

• int 1num;

• float num1;

• char 123;

• double#value;

What is the correct syntax to declare an array of integers with 10 elements?

• int array[10];

• int array(10);

• array int[10];

• int 10[array];

What will be the output of the following code? int i = 5; printf("%d", i++);

• 6

• 5

• 4

• Compilation error

Which of the following loops is guaranteed to execute at least once?

• for loop

• while loop

• do-while loop

• None of the above

How are strings represented in C?

• As character arrays

• As integer arrays

• As float arrays

• None of the above

What is the index of the first element in an array in C?

• 0

• 1

• -1

• Depends on the array size

Which of the following is the correct way to initialize a variable in C?

• int x;

• int x = 10;

• int x = 10.5;

• All of the above

What will be the output of the following code? int arr[] = {10, 20, 30}; printf("%d", arr[1]);

• 10

• 20

• 30

• Compilation error

What will the following code print? char str[] = "Hello"; printf("%s", str);

• Hello

• H

• ello

• Compilation error

Which of the following can be used to read a string in C?

• gets()

• printf()

• scanf()

• Both a and c