Why does printf output random values for double and 0.000000 for int?

Question

I know this is a simple questions, but it came up when I was coding and I am wondering how it works now. So, my first question is that when printf is given an integer like b

Answer 1

You used the wrong format specifiers It should be

int a = 2, b = 5, result = 0;
result = b/a*a;

printf("%d\n", result);

...

double a = 2, b = 5, result = 0;
result = b/a*a;

printf("%f\n", result);