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Convert Lower case alphabets to Upper case in C++

#include <iostream>
using namespace std;
int main()
{
 char string[20];
 cin.getline(string,20,'\n');
 for (int i = 0; i<20; i++)
 {
  if (islower(string[i]))
  {
   string[i] = char(toupper(string[i]));
  }
 }
 cout <<string;
}
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