C++中将string类型转换为double的方法:include <iostream> include <sstream>//使用stringstream需要引入这个头文件 using namespace std;//模板函数：将string类型变量转换为常用的数值类型（此方法具有普遍适用性）template <class Type> Type stringToNum(const string& str){ istringstream iss(str);Type...
string str;cin.getline(str);//利用sstream中的stringstream s=str;stringstream s=str;double d ;s >> d ; //就这么简单！
include <stdio.h>#include <conio.h>#include <iostream>#include <math.h>#include <iomanip>using namespace std;void main(){string strD = "1.265584455454";double d2 = atof(strD.c_str());cout<< std::setprecision(15) <<d2<<endl; string str = "123456.554544";double dbl...
String.valueof(Double)或者double.toString()都可以
这个 方法应该 还是很不错的。include <stdio.h>#include <conio.h>#include <iostream>#include <math.h>#include <iomanip>using namespace std;void main(){string strD = "1.265584455454";double d2 = atof(strD.c_str());cout<< std::setprecision(15) <<d2<<endl; string str = ...
include <stdio.h>#include <conio.h>#include <iostream>#include <math.h>#include <iomanip>using namespace std; void main(){ string strD = "1.265584455454"; double d2 = atof(strD.c_str()); cout<< std::setprecision(15) <<d2<<endl; string str = "123456.554...
include<iostream>#include<cstdlib>using namespace std; int main(){ char* str="90776"; double dvalue=atof(str); cout<<dvalue<<endl; return 0;}