Variables Easy Questions and Answers

Which of the following declaration is not supported by C?

Correct Option: A

It is legal in Java, but not in C.

Will the following C code compile without any error?

#include <stdio.h>
    int main()
    {
        int n;
        {
            int n;
            for (n = 0; n < 12; n++);
        }
    }

Correct Option: B

There can be blocks inside the block. But within a block, variables have only block scope.

Will the following C code compile without any error?

#include <stdio.h>
    int main()
    {
        for (int n = 0; n < 5; n++);
            return 0;
    }

Correct Option: D

Compilers implementing C90 do not allow this, but compilers implementing C99 allow it.

What will be the output of the following C code?

 #include <stdio.h>
    int main()
    {
        k = 23;
        printf("%d\n", k++);
        return 0;
    }

Correct Option: E

Variable k is not defined.

What will be the output of the following C code?

#include <stdio.h>
    int main()
    {
        const int k = 11;
        int *p = &k;
        *p = 22;
        printf("%d\n", k);
        return 0;
    }

Correct Option: C

Changing const variable through non-constant pointers invokes compiler warning.

Variables