test.c

#include <stdio.h>

#define IS_INT_LONG(N) _Generic((N), \
		int: no_int, \
		long int: yes_long, \
		long long int: yes_long_long, \
		default: no_no_int \
)()

void no_int() {
	puts("No, it's int");
}

void yes_long() {
	puts("Yes, it's long int");
}

void yes_long_long() {
	puts("Yes, it's long long int");
}

void no_no_int() {
	puts("It's not an int at all.");
}

int main() {
	int x = 0;
	long int y = 0;
	long long int z = 0;
	char c = 0;
	IS_INT_LONG(x);
	IS_INT_LONG(y);
	IS_INT_LONG(z);
	IS_INT_LONG(c);
	return 0;
}