/* * A function to convert a string into an integer * Author: Danny Battison * Author: Kyle Turley http://www.kturley.com */

#include

int StringToInt (std::string str) { int total = 0; int length = str.length(); // the length of the string int x = 1; // this is our multiplier, used to convert each digit into tens, units, etc for (int i = 1; i < str.length(); i++) x *= 10; // initialise x correctly for (int i = 0; i < length; i++) { // loop through the string // 48 is the base value (ASCII) // multiply it by x to get it into tens, units, etc total += (static_cast (str[i]) - 48) * x; x /= 10; // divide x by 10, to reduce the units by one (thousands, then hundreds, etc) } return total; // return the value as an integer } /** EXAMPLE USAGE **/ #include int main () { std::string s = "12345"; int t = StringToInt(s) + 300; std::cout << t; // should be 1534 (1234 + 300 = 1534)

std::cin.get (); return EXIT_SUCCESS; }