[C 예제] 10진법 정수를 입력하여 2진법,8진법 또는 16진법으로 변환하기

#include <stdio.h>

 

void trans(int ,int ); //함수 선언

 

int main(void)

{

           int a,b; //두 정수

          

           printf("정수 입력 : ");

           scanf("%d",&a);

           printf("진법입력(2,8,16) : ");

           scanf("%d",&b);

          

           trans(a,b);

          

           return 0;

}

 

void trans(int a,int b) //진법변환 함수

{         

           int i,j = 0;

           int mask = 1;

           int temp;

           if(b == 2) { //2진법일경우

                     for(i=31;i>=0;i--) {

                                temp = (a&mask<<i)?1:0;

                                if(j==0 && temp==0)

                                          continue;

                                else if(j==0 && temp==1) {

                                          printf("%d",temp);

                                          j = 1;

                                } else

                                          printf("%d",temp);

                     }

           }

          

           else if(b == 8) //8진법으로

                     printf("결과-> %o",a);

           else if(b == 16) //16진법으로

                     printf("결과-> %x",a);

           else

                     printf("잘못된 입력입니다.");

           printf("\n");

          

           return ;

}