C Programming : Declarations and Initializations

6. What will be the output of the program?

#include<stdio.h>
int X=40;
int main()
{
int X=20;
printf("%d\n", X);
return 0;
}

A. 20

B. 40

C. Error

D. No Output

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Answer: Option A

7. What is the output of the program

#include<stdio.h>
int main()
{
int x = 10, y = 20, z = 5, i;
i = x < y < z;
printf("%d\n", i);
return 0;
}

A. 0

B. 1

C. Error

D. None of these

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Answer: Option B Explanation: Since x < y turns to be TRUE it is replaced by 1. Then 1 < z is compared and to be TRUE. The 1 is assigned to i.

8. What is the output of the program

#include<stdio.h>
int main()
{
extern int fun(float);
int a;
a = fun(3.14);
printf("%d\n", a);
return 0;
}
int fun(int aa)
{
return (int)++aa;
}

A. 3

B. 3.14

C. 0

D. 4

E. Compile Error

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Answer: Option E

9. What is the output of the program

#include<stdio.h>
int main()
{
int a[5] = {2, 3};
printf("%d, %d, %d\n", a[2], a[3], a[4]);
return 0;
}

A. Garbage Values

B. 2, 3, 3

C. 3, 2, 2

D. 0, 0, 0

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Answer: Option D Explanation: When an automatic array is partially initialized, the remaining elements are initialized to 0.

10. What is the output of the program?

#include<stdio.h>
int main()
{
union a
{
int i;
char ch[2];
};
union a u;
u.ch[0] = 3;
u.ch[1] = 2;
printf("%d, %d, %d\n", u.ch[0], u.ch[1], u.i);
return 0;
}

A. 3, 2, 515

B. 515, 2, 3

C. 3, 2, 5

D. None of these

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Answer: Option A