#include<stdio.h> 

int main(){  
    //外层循环变量,控制行  
    int i = 0;  
    //内层循环变量,控制列   
    int j = 0;   
    for(i=1;i<=9;i++){  
        for(j=1;j<=i;j++){  
            printf("%dx%d=%d\t",j,i,i*j);  
        }  
        //每行输出完后换行   
        printf("\n");     
    }  
}

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