Thread: converting string to int!

I got only one error that I do not know how to get it fixed!

Code:

#include <iostream>
using namespace std;

int main(){
string num;
int i = 0;
	
	
	cout << "Insert a number between 10-99"<<endl;
	cin >> num;
	
   i = atoi(num);
	
	if ((i > 9) && (i < 100)){
		cout << "The Inverse number of the input is    " << num[1]<< num[0] << endl;
	}
	else{
		cout << "ERROR: You must select a number between 10-99" << endl;
	}
	
	return 0;
}

You're missing a bunch of header files.
I'd recommend using a stringstream to convert between strings & numbers though.

Code:

std::stringstream ss;
ss << "666";
int num;
ss >> num;

Of course you'd also want to do some checking to see if the conversion failed...

atoi() takes a c-string as input

Code:

   i = atoi(num.c_str());

Try converting string to float. You should also validate like for example the string cannot have more than 1 decimal point. The string should be a valid number etc.And yeah most importantly... don't use atof() function!