#include <stdio.h>
int main(int argc,char **argv)
{
    int i,j,a[11][11];   
    for(i = 1 ; i <= 10 ; i++)
       {
         for (j = 1 ; j <= i ; j++)
            {
                 a[i][1] = 1;
                 a[i][i] = 1;
                 a[i+1][j+1] = a[i][j] + a[i][j+1];
                 printf("%d ",a[i][j]);
            }
           printf("\n");
       }
return 0;
}

#include <stdio.h>
int main(int argc,char **argv)
{
    int i,j,a[12][12];  
    for(i = 1; i <= 10; i++)
    {
        for (j = 1; j <= i; j++)
        {
            a[i][1] = 1;
            a[i][i] = 1;
            a[i+1][j+1] = a[i][j] + a[i][j+1];
            printf("%d ",a[i][j]);
        }
        printf("\n");
    }
    return 0;
}

int a[11][11];

这样 数组的最大下标是a[10][10] 因为是从0开始的 0到10 是11个数 11其实是这个意思

建议下次去C语言版块问 祝楼主好运