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Sample Technical Questions

C Sample Question

  1. void main()
    {
    	while(1){
    		if(printf("%d",printf("%d")))
    			break;
    		else
    			continue;
    	}
    }

    Answer:

    Garbage values

    Explanation:

    The inner printf executes first to print some garbage value. The printf returns no of characters printed and this value also cannot be predicted. Still the outer printf prints something and so returns a non-zero value. So it encounters the break statement and comes out of the while statement.
  2. main()
    {
    	unsigned int i=10;
    	while(i-->=0)
    		printf("%u ",i);
    
    }

    Answer:

    10 9 8 7 6 5 4 3 2 1 0 65535 65534...

    Explanation:

    Since i is an unsigned integer it can never become negative. So the expression i-- >=0 will always be true, leading to an infinite loop.
  3. #include‹conio.h›
    main()
    {
    	int x,y=2,z,a;
    	if(x=y%2) z=2;
    	a=2;
    	printf("%d %d ",z,x);
    }

    Answer:

    Garbage-value 0

    Explanation:

    The value of y%2 is 0. This value is assigned to x. The condition reduces to if (x) or in other words if(0) and so z goes uninitialized.

    Thumb Rule:

    Check all control paths to write bug free code.
  4. main()
    {
    	int a[10];
    	printf("%d",*a+1-*a+3);
    }

    Answer:

    4

    Explanation:

    *a and -*a cancels out. The result is as simple as 1 + 3 = 4 !
  5. #define prod(a,b) a*b
    main() 
    {
    	int x=3,y=4;
    	printf("%d",prod(x+2,y-1));
    }

    Answer:

    10

    Explanation:

    The macro expands and evaluates to as:
    x+2*y-1 => x+(2*y)-1 => 10

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