C Aptitude Questions and Answers

Predict the output or error(s) for the following:

1.     void main()

{

}

Answer:

Compiler error: Cannot modify a constant value. Explanation:

p is a pointer to a "constant integer". But we tried to change the value of the "constant integer".

2. What is the output of this C code?

1.     #include <stdio.h>

2.     void main()

3.     {

4.         int k = 0;

5.         for (k < 3; k++)

6.         printf("Hello");

7.     }

a) Compile time error
b) Hello is printed thrice
c) Nothing
d) Varies

Answer:a

3. What is the output of this C code?

1.     #include <stdio.h>

2.     void main()

3.     {

4.         double k = 0;

5.         for (k = 0.0; k < 3.0; k++)

6.             printf("Hello");

7.     }

a) Run time error
b) Hello is printed thrice
c) Hello is printed twice
d) Hello is printed infinitely

Answer:b