Question

*HOW DO I CHANGE THIS FROM A VOID FUNCTION TO A NON-VOID WITH PARAMETERS?*

#include<iostream>
#include<fstream>
#include<string>

using namespace std;
void studentStats() {
ifstream inputFile;
inputFile.open("outFile.txt");

string studentData;
string studentID;
string ID, exam1, exam2, exam3;
string header;

cout << "Enter a Student ID: ";
cin >> studentID;

bool found =false;

while (inputFile) {
inputFile >> ID;
inputFile >> exam1;
inputFile >> exam2;
inputFile >> exam3;
if (ID.compare(studentID)==0) {
cout << ID << " " << exam1 << " " << exam2 << " " << exam3 << endl;
cout << "FOUND!" << endl;
found=true;
break;
}
}
if(!found) {

cout<<studentID << " NOT FOUND!" << endl;
}

inputFile.close();

}//ends studentStats() function

int main() {
studentStats();
}

Answer 1

Code -

#include<iostream>
#include<fstream>
#include<string>

using namespace std;
//change the void to bool means a boolean variable
bool studentStats() {
ifstream inputFile;
inputFile.open("outFile.txt");

string studentData;
string studentID;
string ID, exam1, exam2, exam3;
string header;

cout << "Enter a Student ID: ";
cin >> studentID;
bool found =false;

while (inputFile) {
inputFile >> ID;
inputFile >> exam1;
inputFile >> exam2;
inputFile >> exam3;
if (ID.compare(studentID)==0) {
cout << ID << " " << exam1 << " " << exam2 << " " << exam3 << endl;
//cout << "FOUND!" << endl;
//found=true;
//whenever id is found return true as a boolean parameter
return true;
break;
}
}
if(!found) {

//cout<<studentID << " NOT FOUND!" << endl;
cout<<studentID<<endl;
//id is not found return false as a boolean parameter
return false;
}

inputFile.close();

}//ends studentStats() function

int main() {
//studentStats() function return true or false so accordingly set the condition
//if it return true means value is found then print Found
if(studentStats()){
cout<<" Found! ";
}//else if not found print it will return false then print Not found
else
cout<<" Not found";
}

Screenshots -