int func_a(int a, int b);
int func_b(int a);
int func_c(int a, int b);

int main(int argc, char **argv)
{
	int int1, int2, int3;
	int ret1, ret2, ret3;
	
	printf("Enter an integer: ");
	scanf("%d", &int1);
	printf("Enter an integer: ");
	scanf("%d", &int2);
	printf("Enter an integer: ");
	scanf("%d", &int3);

	ret1 = func_a(int1, int2);
	ret2 = func_b(int3);
	ret3 = func_c(ret1, ret2);
	
	printf("int1 = %d, int2 = %d, int3 = %d\n",
		int1, int2, int3);
	printf("ret1 = %d, ret2 = %d, ret3 = %d\n",
		ret1, ret2, ret3);

	return 0;
}