库函数， string , integer to char

#include <stdio.h>
//use of itoa: integer to char
//puts output char* 
//convert string to char*
 
//string name with accumulated acount.
string sName = "book-";
int iCount;

char cBuffer[3];
itoa(iCount, cBuffer, 10）；

if(iCount < 10)
    sName += "00";
if(iCount < 100)
    sName += "0";
if(iCount >= 1000)
   std::cerr << "no valid name index" << std::endl;

sName += cBuffer;

puts(sName .c_str() );