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hch19860906

[re] c언어 진수 변환 코딩중인데요...

http://www.hackerschool.org/HS_Boards/zboard.php?id=QNA_programming&no=6410 [복사]

#include <stdio.h>
#include <ctype.h>

int hexValue(char ch)
{
        switch(ch){
         case '0':case '1':case '2':case '3':case '4':case '5':case '6':case '7':case '8':case '9':
                 return (ch - '0');
         case 'A':case 'B':case 'C':case 'D':case 'E':case 'F':
                 return (ch - 'A'+10);
         case 'a':case 'b':case 'c':case 'd':case 'e':case 'f':
                 return (ch - 'a'+10);
         default:
                 return -1;
        }
}

int getIntNum(char firstCharacter)
{
        int num = 0;
        int value;
        char ch;
        if (firstCharacter != '0')
        {
                ch = firstCharacter;
                do
                {
                        num = 10*num + (int)(ch-'0');
                        ch = getchar();
                }while(isdigit(ch));
        }
        else
        {
                ch = getchar();
                if((ch>='0')&&(ch <='7'))
                        do
                        {
                                num = 8*num + (int)(ch-'0');
                                ch = getchar();
                        }while((ch>='0')&&(ch <='7'));
                else if ((ch == 'X') || (ch=='x'))
                {
                        while((value = hexValue(ch=getchar())) != -1)
                                num = 16 * num + value ;
                }
                else num = 0;
        }
        ungetc(ch , stdin);
        return num;
}

int main()
{
        char firstcharacter;
        int nDecimal;
        firstcharacter = getchar();
        nDecimal = getIntNum(firstcharacter);
        printf("Decimal number is %d\n", nDecimal);
        return 0;
}

Hit : 3782 Date : 2013/11/16 10:15