C语言-十进制十六进制转换-蒲公英云

C语言-十进制十六进制转换

1.Rain_Conversion

#include "stdio.h" 
#include "string.h" 
#include "stdlib.h"
#include "limits.h"
#define MAX_SIZE 100
int Conversion(long n,char *ret)
{ 
    int remainder = 0;
    char hex[16] = {  '0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'  };
    int result[MAX_SIZE];
    int i = 0;
    char *rets =NULL;
    memset(result,0x0,MAX_SIZE);
    if(n==0){ 
        *ret = '0';
        return 0;
    }
    while(n>0){ 
        remainder = n%16;
        result[i++] = remainder;
        n /= 16;
    }
    rets = ret;
    for(i=i-1;i>=0;i--){ 
        *ret = hex[result[i]];
        ret++;
    }
    //*ret = '\0';
    ret = rets;
    return 0;
}
int main() 
{ 
    long a = 0;
    char *ret = NULL;
    ret = (char *)malloc(MAX_SIZE);
REPEAT:
    printf("please input num %ld - %ld\n",LONG_MIN,LONG_MAX);
    if( (scanf("%ld",&a) != 1)||(a<0) ){ 
        puts("input err");
        goto REPEAT;
    }
    if( !Conversion(a,ret) ){ 
        printf("num a = %ld,ret = 0x%s\n",a,ret);
    }
    free(ret);
}

2.Gali_Conversion

-—————— 代码出自咖喱鸡

#include "stdio.h"
int main(void)
{ 
    int j,re;
    long int n;
    int i = 0;
    char str[100],ch;
    puts("pleas input n(long int)");
    scanf("%ld",&n);
    while(n!=0){ 
        re = n%16;
        if( re>9 ){ 
            str[i++] = (char)(re - 10) + 'a';
        }else{ 
            str[i++] = (char)re + '0';
        }
        n = n>>4;
    }
    str[i--] = '\0';
    for(j=0;j<((i+1)>>1);j++){ 
        ch = str[i-j];
        str[i-j] = str[j];
        str[j] = ch;
    }
    printf(" 0x%s\n",str);
}