在不访问库的情况下将整数转换为字符串 [英] Convert integer to string without access to libraries

问题描述

我最近阅读了一个样本求职面试问题:

I recently read a sample job interview question:

写一个函数来转换一个整数到一个字符串.假设你没有访问库函数，即itoa() 等...

Write a function to convert an integer to a string. Assume you do not have access to library functions i.e., itoa(), etc...

你会怎么做?

推荐答案

快速解决:(编辑处理负数)

fast stab at it: (edited to handle negative numbers)

int n = INT_MIN;
char buffer[50];
int i = 0;

bool isNeg = n<0;

unsigned int n1 = isNeg ? -n : n;

while(n1!=0)
{
    buffer[i++] = n1%10+'0';
    n1=n1/10;
}

if(isNeg)
    buffer[i++] = '-';

buffer[i] = '';

for(int t = 0; t < i/2; t++)
{
    buffer[t] ^= buffer[i-t-1];
    buffer[i-t-1] ^= buffer[t];
    buffer[t] ^= buffer[i-t-1];
}

if(n == 0)
{
    buffer[0] = '0';
    buffer[1] = '';
}   

printf(buffer);

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