Question

设计函数,求整数n的阶乘,并在主函数中调用该函数(通过循环结构)计算下列多项式:y=1!+3!+5!+7!

Answer 1

#include"stdio.h"
long int cal(long int a)
{
for( long int i=1,sum=1;i<=a;i++)
sum=sum*i;
return sum;
}
void main()
{
long int sum=0;
for(int i=1;i<=7;i=i+2)sum+=cal(i);printf("Result:%d",sum);}

Answer 2

//阶乘算法
static long Factorial(int num)
{
long sum = 1;
for (int i = 1; i <= num; i++)
{
sum *= i;
}
return sum;
}