C语言经典题10道之打印乘法表

 //1.输出9*9 口诀. 9行9列, i控制行, j控制列
    for (int i = 1; i < 10; i++) {
        for (int j = 1; j <= i; j++) {
            int result = j * i;
            printf("%d * %d = %-3d", i, j, result);//其中-3d的作用是输出的时候能对齐;
        }
        printf("\n");//每一行换行
    }



程序输出1 * 1 = 1  
2 * 1 = 2  2 * 2 = 4  
3 * 1 = 3  3 * 2 = 6  3 * 3 = 9  
4 * 1 = 4  4 * 2 = 8  4 * 3 = 12 4 * 4 = 16 
5 * 1 = 5  5 * 2 = 10 5 * 3 = 15 5 * 4 = 20 5 * 5 = 25 
6 * 1 = 6  6 * 2 = 12 6 * 3 = 18 6 * 4 = 24 6 * 5 = 30 6 * 6 = 36 
7 * 1 = 7  7 * 2 = 14 7 * 3 = 21 7 * 4 = 28 7 * 5 = 35 7 * 6 = 42 7 * 7 = 49 
8 * 1 = 8  8 * 2 = 16 8 * 3 = 24 8 * 4 = 32 8 * 5 = 40 8 * 6 = 48 8 * 7 = 56 8 * 8 = 64 
9 * 1 = 9  9 * 2 = 18 9 * 3 = 27 9 * 4 = 36 9 * 5 = 45 9 * 6 = 54 9 * 7 = 63 9 * 8 = 72 9 * 9 = 81