程序：打印九九乘法表

#include<stdio.h>
int main()
{
  int i = 0;
  int j = 0;
  for (i = 1; i <= 9; i++)
  {
    for (j = 1; j <= i; j++)
    {
      printf("%d*%d=%-2d    ", i, j, i * j);
      }
    printf("\n");
  }
  return 0;
}