~cpp 

#include <stdio.h>
#include <stdlib.h>

int main()
{
 int i,Number;
 printf("원하시는 구구단 숫자를 눌러주세요.^^\n"); 
     scanf("%d",&Number);
     printf("%d단\n",Number);
           for(i=1;i<=9;i++)
               {
               printf("%dX%d=%d\n",Number,i,Number*i);
           } 
  system("PAUSE");	
  return 0;
}

~cpp 
#include<stdio.h> 
int main(void)
{ 
   int a,b;
    printf ("숫자입력");
      scanf ("%d",& a);
       for(b=1; b<10; b++)
 printf("%dx%d=%d\n", a,b,a*b);
 
 system("PAUSE");           
 
} 

~cpp 

#include<stdio.h>
int main()
{
     
     int Numbers;   
     int Number;
         
         printf("알고싶은 구구단단계를 쳐주세요.");  
         scanf("%d",&Numbers); 
         for(Number = 1; Number < 10; Number++)
         printf("%dX%d=%d\n",Numbers,Number,Numbers*Number); 
        
 system("PAUSE");          
 return 0;

}

~cpp 
#include <stdio.h>
void main()
{
int i,number;
do {
    printf ("숫자를 입력하세요 :");
    scanf ("%d",&number);
        } while(number <=1 || number >=10); 
    printf ("<%d단>\n",number);    
    for (i=1;i<=9;i++)
    {
        printf ("%dX%d=%2d\n",number,i,number*i);
     }        
    system("pause");
}

~cpp 
#include <stdio.h>
#include <stdlib.h>

int main()

{
   int i;
   int j;
  printf("숫자입력하시오\n");
  scanf("%d", &i);
         for(j=1; j<10; j++)
            printf("%dx%d=%d\n", i, j, i*j);
                
                 

  system("PAUSE");	
  return 0;
}

~cpp 
main(){
int i, num;

   do {
   printf("몇 단을 출력할까요?");
   scanf("%d", &num);
   } while(num<1 || num>9);

   for(i=1; i<=9; i++)
      printf("%d x %d = %d\n", num, i, num*i);

}