《c程序设计语言》读书笔记-3.5-按要求进制位数字转字符串

#include <io.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>

void reverse(char s[])
{
int c,i,j;

for(i = 0,j = strlen(s) - 1;i < j;i++,j--)
c = s[i],s[i] = s[j],s[j] = c;
}

void itoa(int n,char s[],int b)
{
int i,sign,j;

sign = n,i = 0;

do
{
j =  abs(n % b);
s[i++] = (j <= 9) ? j + '0' : j - 10 + 'a';
}while((n /= b) != 0);

if(sign < 0)
s[i++] = '-';
s[i] = '\0';
reverse(s);
}

int main()
{
int n,i,b;
char s[50];
n = -165;
b = 16;

itoa(n,s,b);

for(i = 0;i < strlen(s);i++)
printf("%c  ",s[i]);

return 0;
}