9*9口诀

#include<stdio.h>

int main()
{
int rows, columns, results;
for(rows = 1; rows < 10; rows++)
{
for(columns = 1; columns < 10; columns++)
{
results = rows * columns;
printf("%d * %d = %-3d ", rows, columns, results);//-3d，表示左对齐，占3列
}
printf("\n");
}
return 0;
}