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  1. #include <iostream>
  2.  using namespace std;
  3.  string multiply (string s1, string s2)
  4.  {
  5.     char str[10];
  6.     string ans="";
  7.     int m=s1.length();
  8.     int n=s2.length();
  9.  
  10.     if (!s1.compare("0") || !s2.compare("0"))
  11.          return "0";
  12.  
  13.        int *res = new int[m + n];
  14.  
  15.        for (int i = m - 1; i >= 0; i--)
  16.        {
  17.          for (int j = n - 1; j >= 0; j--)
  18.          {
  19.           res[m + n - i - j - 2] += (s1[i] - '0') * (s2[j] - '0');
  20.           res[m + n - i - j - 1] += res[m + n - i - j - 2] / 10;
  21.           res[m + n - i - j - 2] %= 10;
  22.          }
  23.        }
  24.  
  25.  
  26.        for (int i = m + n - 1; i >= 0; i--)
  27.        {
  28.             if (res[i] != 0) 
  29.             {
  30.                 for (int j = i; j >= 0; j--) 
  31.                 {
  32.                   sprintf(str,"%d", res[j]);
  33.                   ans+=str;
  34.                 }
  35.                 return ans;
  36.             }
  37.  
  38.         }
  39.  }
  40.  
  41. int main() {
  42.  
  43.  cout << multiply("0", "0"); // Doesn't work - prints nothing.
  44.  cout.put(cout.widen('\n'));
  45.  cout.flush();
  46.  // cout << multiply("0", "0") << endl; //works!! This prints "0" correctly
  47.  
  48.  return 0;
  49. }
Success #stdin #stdout 0s 3464KB
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https://ideone.com/PTwXEA
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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