i know the code prints 0 but can someone please explain why it prints 0?

#include

#include

int main()

{

static char str1[] = "cat";

static char str2[10];

static char str3[] = "red";

int i;

i = strcmp(strcat(str3, strcpy(str2, str1)), "redcat");

printf("%d", i);

return 0;

}