Question

C语言编程 求1!+3!+5!+……+N!的值,且N为奇数

求帮忙....写出源代码就可以了
在线的！！！求大神帮忙...感激不尽！！

Answer 1

#include<stdio.h>

int main(){
int n,i;
long a,sum = 1;
printf("请输入一个奇数:\n");
scanf("%ld",&n);
for(i = 3,a = 1;i <= n;i += 2)
{
a *= i * (i - 1);
sum += a;
}
printf("%ld\n",sum);
return 0;
}
本程序已经在VC上运行通过，在N不是很大的情况下可以，太大了就属于大数问题了，要改

Answer 2

#include<stdio.h>
void main()
{
int sum=0;
int i,N,jc=1;
printf("please input N:");
scanf("%d",&N);
for(i=1;i<=N;i=i++)
{
jc=jc*i;
if(i%2!=0)
{
sum=sum+jc;
}
}
printf("the sum of jiecheng is:%d",sum);
}

Answer 3

main(){
int sum,i,j,temp,a;
sum=0;
scanf("%d",a);
for(i=1;i<=a;i+=2){
temp=1;
for(j=1;j<=i;j++){
temp=temp*j;
}
sum+=temp;
}
printf("sum=%d",sum);
}

Answer 4

#include<stdio.h>

long fun(int n)
{
long t = 1;
for(int i = 1; i <= n; i++)
t *= i;
return t;
}

void main()
{
long sum = 0;
int N;
printf("please input N:\n");
scanf("%d",&N);
for(int i= 1; i <= N; i+=2)
sum += fun(i);
printf("sum = %d\n",sum);
}