#include <stdio.h>
#include <stdlib.h>
int main(void)
{
   int i,j;
   for(i=2;i<10;i=i+2)       또는     for(i=1;i<10;i++)
   {
                    for(j=1;j<10;j++)
                    {
                                     if(i<j)    //이거 없으면 1부터9까지 나옴

                                    break
                                     printf("%d*%d=%d\n",i,j,i*j);
                    }
                                     printf("\n");
   }  
system("pause");
return 0;
}

짝수 구구단

2*1

2*2

 

4*1

4*2

4*3

4*4

.

.