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C Programming Questions and Answers – Increment and Decrement Operators 

C Programming Questions and Answers – Increment and Decrement Operators

1.What is the difference between the following 2 codes?

 

#include <stdio.h> //Program 1

int main()

{

int d, a = 1, b = 2;

d =  a++ + ++b;

printf(“%d %d %d”, d, a, b);

}

#include <stdio.h> //Program 2

int main()

{

int d, a = 1, b = 2;

d =  a++ +++b;

printf(“%d %d %d”, d, a, b);

}

a) No difference as space doesn’t make any difference, values of a, b, d are same in both the case

b) Space does make a difference, values of a, b, d are different

c) Program 1 has syntax error, program 2 is not

d) Program 2 has syntax error, program 1 is not

View Answer

Answer:d 

2.What is the output of this C code?

 

#include <stdio.h>

int main()

{

int a = 1, b = 1, c;

c = a++ + b;

printf(“%d, %d”, a, b);

}

a) a = 1, b = 1

b) a = 2, b = 1

c) a = 1, b = 2

d) a = 2, b = 2

View Answer

 

Answer:b 

3.What is the output of this C code?

 

#include <stdio.h>

int main()

{

int a = 1, b = 1, d = 1;

printf(“%d, %d, %d”, ++a + ++a+a++, a++ + ++b, ++d + d++ + a++);

}

a) 15, 4, 5

b) 9, 6, 9

c) 9, 3, 5

d) Undefined (Compiler Dependent)

View Answer

 

Answer:d 

4.For which of the following, “PI++;” code will fail?

a) #define PI 3.14

b) char *PI = “A”;

c) float PI = 3.14;

d) None of the Mentioned

View Answer

Answer:a 

5.What is the output of this C code?

 

#include <stdio.h>

int main()

{

int a = 10, b = 10;

if (a = 5)

b–;

printf(“%d, %d”, a, b–);

}

a) a = 10, b = 9

b) a = 10, b = 8

c) a = 5, b = 9

d) a = 5, b = 8

View Answer

 

Answer:c 

6.What is the output of this C code?

 

#include <stdio.h>

int main()

{

int i = 0;

int j = i++ + i;

printf(“%d\n”, j);

}

a) 0

b) 1

c) 2

d) Compile time error

View Answer

 

Answer:a 

7.What is the output of this C code?

 

#include <stdio.h>

int main()

{

int i = 2;

int j = ++i + i;

printf(“%d\n”, j);

}

a) 6

b) 5

c) 4

d) Compile time error

View Answer

 

Answer:a 

8.Comment on the output of this C code?

 

#include <stdio.h>

int main()

{

int i = 2;

int i = i++ + i;

printf(“%d\n”, i);

}

a) = operator is not a sequence point

b) ++ operator may return value with or without side effects

c) it can be evaluated as (i++)+i or i+(++i)

d) Both a and b

View Answer

 

Answer:a 

 

9.What is the output of this 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

View Answer

 

Answer:a 

10.What is the output of this 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

View Answer

 

Answer:a 

11.What is the output of this 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

View Answer

 

Answer:a 

12.What is the output of this 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

View Answer

 

Answer:b 

13.What is the output of this 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

View Answer

 

Answer:c 

14.What is the output of this 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

View Answer

 

Answer:d 

15.What is the output of this 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

View Answer

Answer:d   

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