C语言10的阶乘算法流程图,c语言编写的多位阶乘算法程序.doc

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多位阶乘

/*本程序是以计算 30000 的阶乘为例*/

/* This file "jiech2.c"

created at 2001-08-24 20:15:22

by LeiPeng .

*/

#include

#include

#include

#include

#include

#include

#define MAXN 0X7000

int a[MAXN];

int main(int argc,char *argv[])

{

int n,m,i,j,c,t;

printf("Enter n(n>=2) :");

while(1)

{

scanf("%d",&n);

if(n>=2&&n<=3276) break;

printf("must be 2<=n<=3276");

}

a[0]=1; m=1;

for(i=2;i<=n;i++)

{

for(c=0,j=0;j

{

t=a[j]*i+c;

a[j]=t%10;

c=t/10;

}

while(c)

{

a[m++]=c%10;

c/=10;

}

}

printf("%d!=\n",n);

for(i=m-1;i>=0;i--) putchar(a[i]+0x30);

printf("\npress any key to continue .\n");

getch();

return 0;

}

/*3000!得结果超出了电脑能显示得范围，所以最好采用数组来记录每位*/