How to convert a string to float and avoid precision issue in C++

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C++

Hello,

I have the following issue in c++.

std::string num = "0.6";
float temp = ::strtof(num.c_str(), nullptr);

Output:

0.600000024

std::string num = ""2999.6";
float temp = ::strtof(num.c_str(), nullptr);

Output:

2999.60010

How to avoid this precision issue ?

What I have tried:

I have tried using sscanf_s

float myAtof(string& num) 
{
	floattmp;
	sscanf_s(num.c_str(), "%f", &tmp);
	return tmp;
}

float myround(float var)
{
	float value = (int)(var * 100 + .5);
	return (float)value / 100;

}

But this does not provide the result expected as 0.6 and 2999.6

Could somebody explain me how to get the value properly converted.
Thanks in advance.