苦恼啊,请各位帮忙!小弟不胜感激!

[hesicong]

一下是我自己编写的计算杨辉三角的程序,执行到n=12以后数值就出现了问题,百般不得其解,望高手指点!
#include <stdio.h>
#include <conio.h>

unsigned long jc(unsigned long n)
{unsigned long i,r=1;
if(n==0) return(1);
for(i=1;i<=n;i++) r*=i;
return(r);
}
unsigned long c(unsigned long n,unsigned long m)
{unsigned long r;r=(jc(n)/(jc(m)*jc(n-m)));
/* printf("now return n!=%ld m!=%ld n-m!=%ld m!*(n-m)!=%ld\n",
jc(n),jc(m),jc(n-m),jc(m)*jc(n-m));*/
return(r);
}


main()
{int i,j;
clrscr();
for(i=1;i<15;i++)
{for(j=0;j<=i;j++) printf("%ld ",c(i,j));
printf("\n");}
}

[proware]

给你写了一个:
main()
{
int a[100][100],i,j,n;

clrscr();
scanf("%d",&n);
for(i=0;i<n;i++)
{
a[i][0]=1;
a[i][i]=1;
for(j=1;j<i;j++)
{
a[i][j]=a[i-1][j-1]+a[i-1][j];
}
}
for (i=0;i<n;i++)
{
for (j=0;j<i+1;j++)
printf("%d ",a[i][j]);
printf("\n");
}
}