打印杨辉三角

[c]代码库

#include<stdio.h>
main()
{
	int a[100][100]={0},i,j,k,n=10;
	int num;
	printf ( "input num:\n" );    /*输入打印的行数*/
	scanf ( "%d",&num );
	a[0][1]=1;                    /*确定第一行的初始值*/
	for ( i=1; i<num; i++ )
	{
		for ( j=1; j<=i+1; j++ )
		{
			a[i][j]=a[i-1][j-1]+a[i-1][j];/*每一个值由这个数的肩上的两个值确定*/
		}
	}
	for ( i=0; i<num; i++ )
	{
		for ( k=0; k<n-i; k++ )           /*留出每行的空间*/
			printf ( "  " );
		for ( j=1; j<=i+1; j++ )
		{
			printf ( "%4d",a[i][j] );
		}
		printf ( "\n" );
	}
}