C语言排列组合（函数

#include <stdio.h>
#include <stdlib.h>
//原型申明
int function(int,int); 
int main(int argc, char *argv[]) {
	    int m,n,k;
	    printf("please input m,n\n");
	    scanf("%d%d",&m,&n);
        //函数调用
	    k=function(m,n);

	    printf("%d wanys %d projects can be selected from %d projects\n",k,n,m);
    	system("pause");
    	return 0;
}
//函数体
int function(int m,int n){
	int k,t,M=1,N=1,T=1;
	t=m-n;
	while(t!=1){
		T=T*t;
		t=t-1;
	}
	while(m!=1){
		M=M*m;
		m=m-1;
		
	}
	while(n!=1){
		N=N*n;
		n=n-1;
			
	}
	k=M/(N*T);
	return k;
}