代码;

main.c

#include <stdio.h>
#include "add.h"
#include "sub.h"

int main(void)
{
	
	int a=10,b=12;
	float x=1.23456,y=9.87654321;
	printf("int a+b IS :%d\n",add_int(a,b));
	printf("int a-b IS :%d\n",sub_int(a,b));
	printf("float x+y IS :%f\n",add_float(x,y));
	printf("float x-y IS :%f\n",sub_float(x,y));
	return 0;
}

add_int.c

int add_int(int a,int b)
{
	return a+b;
}

add_float.c

float add_float(float a,float b)
{
	return a+b;
}

sub_int.c

int sub_int(int a,int b)
{
	return a-b;
}

sub_float.c

float sub_float(float a,float b)
{
	return a-b;
}

编译运行