converting strings to floats with "strtof" isn't working for me

[jeb41]

I'm trying to convert a string to a float and I can't figure it out as my code keeps failing to compile at the line where I use the strtof function, can anyone help? I've read http://www.cplusplus.com/reference/cstdlib/strtof/ and as far as I can tell I'm doing it right.

I currently have this as my code:

#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <string>

using namespace std;

int main ()
{
string str_name="23423.34"
float a;

a = strtof (str_name, NULL);

cout << a;

return 0;
}

[Cubbi]

It's either stof(str_name) (demo: http://coliru.stacked-crooked.com/a/2d045078cf8e3248 )
or strtof(str_name.c_str(), NULL) (demo: http://coliru.stacked-crooked.com/a/ce21607912185212 )

[Danny Toledo]

Four issues:

1. Put code in [code][/code] tags
2. Post the errors you get
3. You are missing a semicolon on the line declaring your string
4. strtof takes a c-string, not an std::string, so change to a = strtof (str_name.c_tr(), NULL);

Is there any reason you cannot use std::stof?

http://www.cplusplus.com/reference/string/stof/

[jeb41]

i didn't know of std::stof and the semicolon is just a mistake i made when typing it into the forum but thanks for the info on posting.

but with your example does anything need to be in the parenthesis?

[jeb41]

nevermind Cubbi's demo answered my question thanks for the help.

[Danny Toledo]

but with your example does anything need to be in the parenthesis?

I assume that you refer to this: [..].c_tr()[..]? If so, no, nothing needs to be in those parenthesis:

http://www.cplusplus.com/reference/string/string/c_str/