fork download 
  1. #include <iostream>
  2. #include <string>
  3.  
  4. using namespace std;
  5.  
  6. int str_to_int(string a);
  7.  
  8. int main() {
  9.     string s = "9999XxX999";
  10.     cout << str_to_int(s);
  11. }
  12.  
  13. int str_to_int(string a) {
  14.     int num = 0;
  15.     int tmp;
  16.     bool anti = false;
  17.     double l = 1;
  18.  
  19.     for(int i = a.size() - 1; i >= 0; --i, l *= 10) {
  20.         if(a[i] == '0') {tmp = 0;}
  21.  
  22.         if(a[i] >= '0' && a[i] <= '9') {tmp = a[i] - '0';}
  23.  
  24.         else if(i == 0 && a[i] == '-') {anti = true; break;}
  25.  
  26.  
  27.         else {
  28.                 return 0;
  29.         }
  30.  
  31.         num += (tmp * l);
  32.     }
  33.  
  34.     if(anti == true) {return -num;}
  35.     else {return num;}
  36. }
Success #stdin #stdout 0.02s 2856KB
comments (?)
stdin 
Standard input is empty
stdout 
Standard output is empty
https://ideone.com/gjwFvj
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!