in my program, i put the user enters into a string, then i need to get some information out of the string and store it into a char or double. would anyone give me some help ? THX
How to convert type string to char/double ?
in my program, i put the user enters into a string, then i need to get some information out of the string and store it into a char or double. would anyone give me some help ? THX
blow me ... ...
you need to specify what type of string you are using.
For "simple" null terminated char arrays use atoi()
if cString is a char[] and myInt is an int
myInt = atoi(cString);
For instances of the STL string class use the c_str() method in addition to atoi();
myInt = atoi(stlString.c_str());
Some other string classes have methods that facilitate the conversion
i used this:
how can i pass value in these variable ?Code:#include<string> string a; double b; char c;
blow me ... ...
as he said up there by using c_str() function with the stl string class.
Since atoi only takes input of older character arrays for strings you have to use the function c_str() to convert a stl string to one. That code puts "123456789" into string a and then using atoi() puts it as a variable into int b.Code:#include <iostream> #include <stdlib.h> using namespace std; int main(int argc, char *argv[]) { string a; int b; a = "123456789"; b = atoi(a.c_str()); /* b now equals 123456789 */ cout<<b; system("PAUSE"); return 0; }
Because I can't.
And the C++ way...
ggCode:#include <iostream> #include <sstream> #include <string> using namespace std; int main() { string a = "123.456 Z"; double d; char c; istringstream istream(a); istream >> d >> c; cout << "d = " << d << endl; cout << "c = " << c << endl; return 0; }//main
thank you for your help, now i have solved my problem.
blow me ... ...
When all else fails, read the instructions.
If you're posting code, use code tags: [code] /* insert code here */ [/code]
