Write A C++ Program To Convert String To Integer: Atoi.

#include<conio.h> 
 #include <iostream.h> 
 #include <stdlib.h> 
 void main() 
 { 
        int i; 
        char str[256]; 
        clrscr(); 
        cout<<"Enter a Number: "; 
        cin.get(str,256); 
        i = atoi ( str ); 
        cout<<i<<" its Double = "<<i * 2; 
        getch(); 
 }