C Programming Questions and Answers – Increment and Decrement Operators – 2

Here is a listing of C questions and puzzles on “Increment and Decrement Operators” along with answers, explanations and/or solutions:

1. What will be the output of the following C code?

#include <stdio.h>
int main()
{
int i = 0;
int x = i++, y = ++i;
printf(“%d % d\n”, x, y);
return 0;
}
a) 0, 2
b) 0, 1
c) 1, 2
d) Undefined

Answer: a
Explanation: None.

2. What will be the output of the following C code?

#include <stdio.h>
int main()
{
int i = 10;
int *p = &i;
printf(“%d\n”, *p++);
}
a) 10
b) 11
c) Garbage value
d) Address of i

Answer: a
Explanation: None.

3. What will be the output of the following C code?

#include <stdio.h>
void main()
{
int x = 97;
int y = sizeof(x++);
printf(“X is %d”, x);
}
a) X is 97
b) X is 98
c) X is 99
d) Run time error

Answer: a
Explanation: None.

4. What will be the output of the following C code?

#include <stdio.h>
void main()
{
int x = 4, y, z;
y = –x;
z = x–;
printf(“%d%d%d”, x, y, z);
}
a) 3 2 3
b) 2 3 3
c) 3 2 2
d) 2 3 4

Answer: b
Explanation: None.

5. What will be the output of the following C code?

#include <stdio.h>
void main()
{
int x = 4;
int *p = &x;
int *k = p++;
int r = p – k;
printf(“%d”, r);
}
a) 4
b) 8
c) 1
d) Run time error

Answer: c
Explanation: None.

6. What will be the output of the following C code?

#include <stdio.h>
void main()
{
int a = 5, b = -7, c = 0, d;
d = ++a && ++b || ++c;
printf(“\n%d%d%d%d”, a, b, c, d);
}
a) 6 -6 0 0
b) 6 -5 0 1
c) -6 -6 0 1
d) 6 -6 0 1

Answer: d
Explanation: None.

7. What will be the output of the following C code?

#include <stdio.h>
void main()
{
int a = -5;
int k = (a++, ++a);
printf(“%d\n”, k);
}
a) -4
b) -5
c) 4
d) -3

Answer: d
Explanation: None.

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