新人求解

给你一个全的用循环和递推方法都有：
// factor.c -- uses loops and recursion to calculate factorials
#include <stdio.h>
long fact(int n);
long rfact(int n);
int main(void)
{
int num;
printf("This program calculates factorials.\n");
printf("Enter a value in the range 0-12 (q to quit):\n");
while (scanf("%d", &num) == 1)
{
if (num < 0)
printf("No negative numbers, please.\n");
else if (num > 12)
printf("Keep input under 13.\n");
else
{
printf("loop: %d factorial = %ld\n",
num, fact(num));
printf("recursion: %d factorial = %ld\n",
num, rfact(num));
}
printf("Enter a value in the range 0-12 (q to quit):\n");
}
printf("Bye.\n");
return 0;
}
long fact(int n) // loop-based function
{
long ans;
for (ans = 1; n > 1; n--)
ans *= n;
return ans;
}
long rfact(int n) // recursive version
{
long ans;
if (n > 0)
ans= n * rfact(n-1);
else
ans = 1;
return ans;
}


#include<stdio.h>
int main()
{
int s[4][4],i,j,k;
for(i=0;i<4;i++);
for(j=0;j<4;j++);
s[i][j]=i-j;
for(i=0;i<4;i++);
for(j=0;j<4;j++);
{k=s[i][j];
s[i][j]=s[j][i];
s[j][i]=k;
}
for(i=0;i<4;i++);
{printf("\n");
for(j=0;j<4;j++);
printf("4%d",s[i][j]);
}
return 0;
}

好长 看不懂饿~~~

上面的程序运行不出帮忙看一下错出哪里

咋没人回啊，高手们帮忙啊

for(i=0;i<4;i++); 我是新手 我只知道；这个分号好像不要的

后面for的 都不要的

楼上的怎么都写的这么长 这个几行就可以了呀
#include <stdio.h>
int fun(int num)
{
if(num==1)
{
return 1;
}
return num*fun(num-1);
}
void main()
{
int number=5;
number=fun(number);
printf("%d",number);
}