Where does 8 come from, when there is no input from the user?

Question

#include <stdio.h>

int main ()
{

int a,b,c;
printf("Enter the values of a and b") ;
scanf("%d%d", &a, &b) ;
c=a+b;
printf ("The sum is %d", c) ;

return 0 ;
}

Answer 1

Do you mean if the user fails to input anything?

By only declaring a variable, you basically only 'mark the spot' where you want to store it.

But if you don't put something there (initialize), that spot still contains what was there before - could be anything really.

Answer 2

I mean when u run it, it quickly outputs
Enter the values of a and b
The sum is 8, it doesn't ask for user input

Answer 3

Have you tried it here on Sololearn only?

Yeah, this place is somewhat special about user input:

You have to put it in the popup window in the beginning and hit submit.

I just tried it - worked!

If you don't input anything though - see what I wrote above.

Answer 4

Thanks it worked