Created
February 24, 2020 05:36
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c语言风格和c++风格stirng转int
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#include <iostream> | |
#include <string> | |
#include <sstream> | |
using namespace std; | |
// c语言风格将string转为int, 缺点是不会进行数字检查,遇到非法字符就终止了,直接输出0 | |
void CStyle() { | |
string str = "123s"; | |
int a = atoi(str.c_str()); | |
// 支持多进制转换 | |
int b = strtol(str.c_str(), nullptr, 10); | |
cout << a << " " << b << endl; | |
} | |
// c++语言风格 | |
void CppStyle() { | |
string str1 = "asq."; | |
// int c= stoi(str1); //exception | |
string str2 = "12343"; | |
int d = stoi(str2); | |
cout << d << endl; | |
} | |
// 自定义转换 | |
int StringToInt(const string& s) { | |
int v; | |
stringstream ss; | |
ss << s; | |
ss >> v; | |
return v; | |
} | |
int main() { | |
CStyle(); | |
CppStyle(); | |
int i = StringToInt("2.3"); | |
cout << i << endl; | |
return 0; | |
} |
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