c++数字转换为字符串

#include "stdafx.h"
#include<iostream>
#include<string>
using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
    char c;
    int a=1;
    c=a+'0';
    cout<<c<<endl;
    int num=12345;
    char *cnum = new char[5];
    int i=0;
    while(num){
        int decate = num%10;
        cnum[i++]=decate+'0';
        num=num/10;
    }
    int len = sizeof(cnum)/sizeof(char);
    cout<<len<<endl;
    for(int i=0;i<len/2;i++){
        int temp=cnum[i];
        cnum[i]=cnum[len-i];
        cnum[len-i]=temp;
    }
    cout<<cnum<<endl;
    return 0;
}