[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=%2d  ", i, j, i*j);
        }
        printf("\n");
    }
    return 0;
}

输出结果

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

python代码：

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

输出结果

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