[C&Python]9x9乘法口诀打印

C语言代码：

#include <stdio.h>
int main()
{
    int i, j;
    i=j=1;
    for (i=1;i<10;i++) {
        for (j=1;j<=i;j++) {
            printf("%dx%d=%d", j, i, i*j); //注意j与i的顺序
            if (i*j < 10) {
                printf("   "); //乘积小于10，结尾空3格
            }
            else {
                printf("  "); //乘积>=10，结尾空2格
            }
        }
        printf("
");
    }
    return 0;
}

输出结果

1x1=1   
1x2=2   2x2=4   
1x3=3   2x3=6   3x3=9   
1x4=4   2x4=8   3x4=12  4x4=16  
1x5=5   2x5=10  3x5=15  4x5=20  5x5=25  
1x6=6   2x6=12  3x6=18  4x6=24  5x6=30  6x6=36  
1x7=7   2x7=14  3x7=21  4x7=28  5x7=35  6x7=42  7x7=49  
1x8=8   2x8=16  3x8=24  4x8=32  5x8=40  6x8=48  7x8=56  8x8=64  
1x9=9   2x9=18  3x9=27  4x9=36  5x9=45  6x9=54  7x9=63  8x9=72  9x9=81  

python代码：

for i in range(1,10):
    for j in range(1,10):
        if j <= i:
            print(f"{j}x{i}={i*j}",end='')
            if i*j < 10:
                print(" " * 3, end='')
            else:
                print(" "*2, end='')
    print()

输出结果

1x1=1   
1x2=2   2x2=4   
1x3=3   2x3=6   3x3=9   
1x4=4   2x4=8   3x4=12  4x4=16  
1x5=5   2x5=10  3x5=15  4x5=20  5x5=25  
1x6=6   2x6=12  3x6=18  4x6=24  5x6=30  6x6=36  
1x7=7   2x7=14  3x7=21  4x7=28  5x7=35  6x7=42  7x7=49  
1x8=8   2x8=16  3x8=24  4x8=32  5x8=40  6x8=48  7x8=56  8x8=64  
1x9=9   2x9=18  3x9=27  4x9=36  5x9=45  6x9=54  7x9=63  8x9=72  9x9=81