how do i convert a string to a float?

how do i convert a string to a float in c++?

and whats the difference between float and double?

thanks in advance.

Becouse no one else will help you:

float thefloat;
thefloat=atof(string);

atof - C++ Reference


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A float is not precies. if you do 10.0f/3.0f*3.0f = 9.9999999999999f
But a float is smaller, so a double is bigger. (in memory usage)

Type double is a floating type that is larger than or equal to type float, but shorter than or equal to the size of type long double.