C MCQs - 8

What will be the output of the following code snippet?

#include <stdio.h>
int main() {
    int i = 0;
    for (; i < 5; ++i) {
        if (i == 2)
            break;
        printf("%d ", i);
    }
    printf("%d\n", i);
    return 0;
}

a) 0 1 2
b) 0 1 3
c) 0 1 4
d) 0 2

Answer: a) 0 1 2

In C, which escape sequence is used to represent a backslash character?

a) \b
b) \t
c) \n
d) \

Answer: d) \

What will be the output of the following code?

#include <stdio.h>
int main() {
    int x = 10;
    printf("%d\n", x++);
    printf("%d\n", x);
    return 0;
}
 

a) 10, 11
b) 10, 10
c) 11, 11
d) 11, 10

Answer: a) 10, 11

Which function is used to find the smallest integer not less than x in C?

a) ceil()
b) floor()
c) round()
d) trunc()

Answer: a) ceil()

What does the isalpha() function in C do?

a) Checks if a character is alphabetic
b) Checks if a character is a digit
c) Checks if a character is a whitespace character
d) Checks if a character is a punctuation character

Answer: a) Checks if a character is alphabetic

What will be the output of the following code?

#include <stdio.h>
int main() {
    int x = 10;
    printf("%d\n", x / 3);
    return 0;
}

a) 3
b) 3.3333
c) 3.0
d) Compiler error

Answer: a) 3

Which of the following is NOT a valid way to declare and initialize a string in C?

a) char str[] = "Hello";
b) char str[6] = "Hello";
c) char str[] = {'H', 'e', 'l', 'l', 'o', '\0'};
d) char str[5] = "Hello";

Answer: d) char str[5] = "Hello";

What is the output of the following code?

#include <stdio.h>
int main() {
    int x = 5, y = 10;
    printf("%d\n", (x > y) ? x : y);
    return 0;
}

a) 5
b) 10
c) 15
d) Compiler error

Answer: b) 10

What does the strncpy() function in C do?

a) Copies one string to another
b) Compares two strings
c) Concatenates two strings
d) Copies a specified number of characters from one string to another

Answer: d) Copies a specified number of characters from one string to another

What will be the output of the following code?

 #include <stdio.h>
int main() {
    int x = 10;
    printf("%p\n", &x);
    return 0;
}

a) Address of x
b) Value of x
c) Address of ptr
d) Compiler error

Answer: a) Address of x