C Language--Yang Hui Triangle

#include<stdio.h>
#define MAX 100
void main()
{
	int i,j,n;
	int a[MAX][MAX];
	printf("Please enter the number of lines in Yanghui's triangle: ");
	scanf("%d",&n);
	for(i=0;i<n;i++)
		for(j=0;j<n;j++)
		{
			a[i][0]=1;
			a[i][i]=1;
		}
	for(i=2;i<n;i++)
		for(j=1;j<=i-1;j++)
			a[i][j]=a[i-1][j-1]+a[i-1][j];
	for(i=0;i<n;i++)
	{
		for(j=0;j<=i;j++)
			printf("   %d   ",a[i][j]);
		printf("\n");
	}
}

result