Test: Pointers and Addresses - Class 6 MCQ

Comment on the following C statement.

const int *ptr;

What will be the output of the following C code?

    #include <stdio.h>
    int main()
    {
        char *p = NULL;
        char *q = 0;
        if (p)
            printf(" p ");
        else
            printf("nullp");
        if (q)
            printf("q\n");
        else
            printf(" nullq\n");
    }

What will be the output of the following C code?

    #include <stdio.h>
    int main()
    {
        int i = 10;
        void *p = &i;
        printf("%f\n", *(float*)p);
        return 0;
    }

What will be the output of the following C code?

    #include <stdio.h>
    int *f();
    int main()
    {
        int *p = f();
        printf("%d\n", *p);
    }
    int *f()
    {
        int j = 10;
        return &j;
    }

What will be the output of the following C code?

    #include <stdio.h>
    int main()
    {
        int *ptr, a = 10;
        ptr = &a;
        *ptr += 1;
        printf("%d,%d/n", *ptr, a);
    }

Which of the following does not initialize ptr to null (assuming variable declaration of a as int a=0;)?

What will be the output of the following C code?

    #include <stdio.h>
    int x = 0;
    void main()
    {
        int *const ptr = &x;
        printf("%p\n", ptr);
        ptr++;
        printf("%p\n ", ptr);
    }

What will be the output of the following C code?

    #include <stdio.h>
    void main()
    {
        int x = 0;
        int *ptr = &5;
        printf("%p\n", ptr);
    }

Which is an indirection operator among the following?

What will be the output of the following C code?

    #include <stdio.h>
    int x = 0;
    void main()
    {
        int *ptr = &x;
        printf("%p\n", ptr);
        x++;
        printf("%p\n ", ptr);
    }

What will be the output of the following C code?

    #include <stdio.h>
    void main()
    {
        int x = 0;
        int *ptr = &x;
        printf("%p\n", ptr);
        ptr++;
        printf("%p\n ", ptr);
    }

What will be the output of the following C code?

    #include <stdio.h>
    void main()
    {
        int x = 0;
        int *ptr = &x;
        printf("%d\n", *ptr);
    }