school/cpp/8.9.2-Modify-a-string-arameter/main.cpp

#include <iostream>
#include <string>
using namespace std;

void MakeSentenceExcited(string& sentenceText) {

   /* Your solution goes here  */
  //Note that I had to use single quotes.   
   for (int i =0; i<sentenceText.size();i++){
    if (sentenceText.at(i) == '.'){
       sentenceText.at(i) = '!';
    }
   }

}

int main() {
   string testStr;

   getline(cin, testStr);
   MakeSentenceExcited(testStr);
   cout << testStr;

   return 0;
}