一、int型转string型
1、to_string函数,头文件#include<string>
c++11标准增加了全局函数std::to_string:
string to_string (int val);
string to_string (long val);
string to_string (long long val);
string to_string (unsigned val);
string to_string (unsigned long val);
string to_string (unsigned long long val);
string to_string (float val);
string to_string (double val);
string to_string (long double val);
例子:
#include<iostream>
#include<string>
using namespace std;int main() {int a = 88;string ss = to_string(88) + "helloworld";cout << ss <<endl;return 0;
}
二、string型转int型
1、atoi()函数,头文件#include<string>
atoi()函数的参数是const char*类型,如果将string字符串转换为int,需要先通过c_str()函数先将string转换为const char*类型,不然会报错的:
正确实例:
#include<iostream>
#include<string>
using namespace std;int main() {string ss = "123456";cout << atoi(ss.c_str()) << endl;return 0;
}
2、stoi()函数,头文件#include<string>,建议用stoi()函数,方便
stoi()的参数是const string&,不需要转换为const char*
#include<iostream>
#include<string>
using namespace std;int main() {string ss = "123456";cout << stoi(ss) << endl;return 0;
}