Question

Create a Visual Studio console project named exercise093. In the exercise093.cpp file first define a function

void lowerToUpper(std::string & sentence)

that iterates over all characters in the sentence argument. Any lowercase letter should be converted to uppercase. This can be done by including <cctype> and testing each character in sentence with the islower() function. If islower(sentence[i]) returns true then sentence[i] should be replaced with toupper(sentence[i]). The main() function should assign "Hello how are you doing?" to sentence, call lowerToUpper(sentence), and use an if statement to check the new value of sentence. If the result is correct then main() should return 0 as usual. If the result is not correct then main() should display a descriptive error message (indicating the function called, argument and the incorrect result) on the console, and main() should return -1. This provides a unit test for the lowerToUpper() function.

Finally, see what happens when you rerun the program after changing the function interface to

void lowerToUpper(std::string sentence)

Answer 1

Please find below code in c++ and don't forget to give a Like

Note: Given scenario has a method with void but mentioned that this method should return a sentence to main function. If the void is present this can't return any value. So, changed the void to String type and returning the converted string to main function.

Code:

#include <iostream>
#include <cctype>
#include <string>
using namespace std;
string lowerToUpper(std::string sentence){
string new_se="";
for(int i=0;i<sentence.length();i++){
if(islower(sentence[i])){
new_se+=toupper(sentence[i]);
}
else{
new_se+=sentence[i];
}
}
return new_se;
}

int main()
{
string sentence,new_sentence;
cout<<"Hello how are you doing?\n";
cout<<"Enter sentence to convert: ";
getline(cin,sentence);
new_sentence=lowerToUpper(sentence);
if(new_sentence==sentence){
cout<<"the function called, argument and the incorrect result";
return -1;
}
else{
return 0;
}
  
}

Screenshot of code and output: