5 *~~九九乘法表

int main()
{
int i, j;
for (i = 1; i <= 9; i++)
{
for (j = 1; j <= i; j++)
{
printf("%d*%d=%2d ", j, i, j * i);
}
printf("\n");
}
return 0;

bug：结果占据两个字符？%2d

收获：控制第二个循环 j < = i