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Oh ok. I made mistaken. Thanks.

Go look to find some C++ books at any book stores. Then that will help you. Lol

Hmm..Are you using on Linux?

I am using on Dev C++. However, I couldn't figure out it...because I got few errors.

In function `int StringToNumber(std::string)':
13 no match for 'operator>' in 'converter > result'
...

Never mine. I already problem solved because I found out it. Show it here.



(i <= sqrt((double)n))


It would worked. :-)

I mean, Number 15 is error. It is said that C:\Users\Duy N. Le\Desktop\C++\prime1.cpp
call of overloaded `sqrt(int&)' is ambiguous

I don't know what should I doing. About cmath. Here



#include <iostream>
#include <cmath>

using namespace std;

int main() {