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;}