Question

C语言：输入两个正整数m和n(要求m〈=n)求m！+（m+1）！+……n！ 谢啦

Answer 1

#include "stdio.h"
main()
{
int m,n,i;
long int sum=1,sum1=1,sum2=1,t;
printf("请输入m>n\n");
scanf("%d",&m);
scanf("%d",&n);
while(m<n)
{
clrscr();
printf("请重新输入m,n\n");
scanf("%d",&m);
scanf("%d",&n);
}
for(i=1;i<=m;i++)
sum=sum*i;
for(i=1;i<=m-n;i++)
sum1=sum1*i;
for(i=1;i<=n;i++)
sum2=sum2*i;
t=sum/sum1*sum2;
printf("m!/(m-n)!*n!=%ld",t);

}

Answer 2

#include<stdio.h>

int aa(int a)
{
int sum=1,i=1;
for(;i<=a;i++)
sum*=i;
return sum;
}

void main()
{
int m,n,sum=0;
printf("请输入两个数:");
scanf("%d%d",&m,&n);

for(;m<=n;m++)
sum+=aa(m);

printf("%d到%d的阶乘和为：%d\n",m,n,sum);
}

Answer 3

int main(){
int m,n;
cin>>m>>nj;
if(m>n){cout<<"error";exit(0);}
int sum=0;
for(int i=m;i<=n,i++)
{
int temp=1;
for(int j=m;j>=1;j--)temp=temp*j;
sum=sum+temp;
}
cout<<sum;
return(0);
}