Copy value of a string variable into a float variable in C++?

Can anyone help me copy the value of a string variable into a float variable using c++? The value of the string IS a number, but it needed to be input as a string, and then I need to transfer it into a float variable (or int, whichever works best). PLEASE HELP ME!!! This is not for a project or anything for school, it is for a private project of mine that will be featured on my website, www.manlawonline.org ok people? so please help me!!!! remember C/C++!!! Thank you in advance!

Copy value of a string variable into a float variable in C++?
double a;


char *val="3.1415926";





a=atof(val);





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Well, the answer above is for C only with char * as the string





C++ would be:





I hard coded 20 and 19...you can optimize those.





char val[20];


double a;





memset(val, '\0',20 );


string str = "3.1415926";


str.copy( val, 19 );


a=atof(val);

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