Output of C programs | Set 43

1. What is the output of following program? C

#include <stdio.h>
int main()
{
    int a = 1, b = 2, c = 3;
    c = a == b;
    printf("%d", c);
    return 0;
}

Choose the correct answer: (A) 0 (B) 1 (C) 2 (D) 3

Answer : (A)

Explanation : "==" is relational operator which returns only two values, either 0 or 1. 0: If a == b is false 1: If a == b is true Since a=1 b=2 So, a == b is false hence C = 0. 2. What is the output of following program? C

#include <stdio.h>
int main()
{
    int a = 20;
    ;
    ;
    printf("%d", a);
    ;
    return 0;
}

Choose the correct answer: (A) 20 (B) Error (C) ;20; (D) ;20

Answer : (A)

Explanation : ; (statement terminator) and no expression/statement is available here, so this is a null statement has no side effect, hence no error is occurred. 3. What is the output of following program? C

#include <stdio.h>
int main()
{
    int a = 15;
    float b = 1.234;
    printf("%*f", a, b);
    return 0;
}

Choose the correct answer: (A) 1.234 (B) 1.234000 (C) Compilation Error (D) Runtime error

Answer : (B)

Explanation : You can define width formatting at run time using %*, This is known as Indirect width precision. printf("%*f", a, b); is considered as "%15f", hence value of b is printed with left padding by 15. 4. What is the output of following program? C

#include <stdio.h>
void main()
{
    int a = 1, b = 2, c = 3;
    char d = 0;
    if (a, b, c, d)
    {
        printf("EXAM");
    }
}

Choose the correct answer: (A) No Output and No Error (B) EXAM (C) Run time error (D) Compile time error

Answer : (A)

Explanation :Print statement will not execute because ' if 'condition return false. Value of variable d is 0. 5. What is the output of following program? C

#include <stdio.h>
void main()
{
    int a = 25;

    printf("%o %x", a, a);
    getch();
}

Choose the correct answer: (A) 25 25 (B) 025 0x25 (C) 12 42 (D) 31 19 (E) None of these

Answer : (D)

Explanation : %o is used to print the number in octal number format. %x is used to print the number in hexadecimal number format. Note: In c octal number starts with 0 and hexadecimal number starts with 0x.