Convert string to float?

I've got two floats but they're as strings. how do i get this code to work. I don't know how to convert them so i can compare them. it's read from standard input that's why they're char*. The code below is just an example, i know it's not goin2 work lol. Please tell me how to convert so i can compare, thanx :)

Code:

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char* f1 = 3.2;
char* f2 = 4.53;

if(f1 > f2) {

cout << "F1 is bigger" <<endl;

}else {

cout <<F2 is bigger" <<endl;

}

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strtod()

Since this is C++, not C, you should use a std::stringstream

Code:

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std::stringstream ss;
std::string str = "3.14";
float f = 0.0f;
ss << str;
ss >> f;

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Moved to C++ programming forum.

You can try boost::lexical_cast which is powerful & convenient.

lexical_cast

Hi,

You can use the method atof() to implement it!

#include <stdlib.h>

……
char* f1 = 3.2;
char* f2 = 4.53;

int a, b;
a = atof(f1);
b = atof(f2);

Carle
_______________
Comm100 - Open Source & Free Hosted Customer Service Software

Quote:

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Originally Posted by carle

Hi,

You can use the method atof() to implement it!

#include <stdlib.h>

……
char* f1 = 3.2;
char* f2 = 4.53;

int a, b;
a = atof(f1);
b = atof(f2);

Carle
_______________
Comm100 - Open Source & Free Hosted Customer Service Software

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No. atof() is also C. The stringstream idea is C++.

Would do you gain from trying to assign a floating number to a char pointer?
Answer: nothing. Do not even attempt it.