九九乘法表
int sum = 0;
for (int i1 = 1;i1<=9 ;i1++ )
{
for (int i2 = 1; i2 <= i1;i2++)
{
sum = i1 * i2;
string str = null;
if (sum < 10)
str = sum + " ";
else
str = sum.ToString();
Console.Write("{0}*{1}={2} ", i2, i1, str);
if (i1 == i2)
{
Console.Write("\n");
}
}
}
Console.ReadKey();
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