//乘法口诀表输出
    for (int i = 1; i<=9; i++) {
        for (int j = 1; j<=i; j++) {
            NSLog(@"%dx%d=%d\n",i,j,i*j);
        }
    }

//乘法口诀输入
        for i in 1...9 {
            for j in 1...i
            {
                print("\(i)x\(j)=\(i*j)\n")
            }
        }