C Variables - Free MCQ Practice Test with solutions, Grade 7 Programming

What will be the output of the following C code?

    #include <stdio.h>
    int x;
    void main()
    {
        printf("%d", x);
    }

What will be the output of the following C code?

    #include <stdio.h>
    int x = 5;
    void main()
    {
        int x = 3;
        printf("%d", x);
        {
            int x = 4;
        }
        printf("%d", x);
    }

Global variables are ____________

Which part of the program address space is p stored in the following C code?

    #include <stdio.h>
    int *p = NULL;
    int main()
    {
        int i = 0;
        p = &i;
        return 0;
    }

What will be the output of the following C code (without linking the source file in which ary1 is defined)?

    #include <stdio.h>
    int main()
    {
        extern ary1[];
        printf("scope rules\n");
    }

Array sizes are optional during array declaration by using ______ keyword.

Automatic variables are allocated space in the form of a __________

What is the scope of an automatic variable?

What will be the output of the following C code?

     #include <stdio.h>
    int main()
    {
        printf("%d", d++);
    }
    int d = 10;

What will be the output of the following C code?

    #include <stdio.h>
    static int x = 5;
    void main()
    {
        x = 9;
        {
            int x = 4;
        }
        printf("%d", x);
    }

Comment on the following 2 C programs.

    #include <stdio.h> //Program 1
    int main()
    {
        int a;
        int b;
        int c;
    }
 
   #include <stdio.h> //Program 2
    int main()
    {
        int a;
        {
            int b;
        }
        {
            int c;
        }
    }

What will be the output of the following C code?

    #include <stdio.h>
    static int x = 5;
    void main()
    {
        int x = 9;
        {
            x = 4;
        }
        printf("%d", x);
    }

Automatic variables are stored in ________

Which of the following storage class supports char data type?

What will be the x in the following C code?

    #include <stdio.h>
    void main()
    {
        int x;
    }