C/C++里string与int的相互转换算法

#include <string> using namespace std; //将整型转换为string型 string int2str(int num) { if ( num == 0 ) { return "0"; } string str=""; //将num的绝对值赋予t int t = num>0 ? num : -1*num; while (t) { str = (char)(t%10+48)+str; t /= 10; } if ( num < 0 ) { str = "-" + str; } return str; } //将string型转换为int型 int str2int(string str) { int i; int num =0; int len=str.size(); i = 0; if ( str[ 0 ] == '-' ) { i = 1; } while ( i < len ) { num = num*10 + (int)(str[i]-'0'); i++; } if ( str[0]=='-' ) { num *= -1; } return num; }