Question

*HOW TO SEARCH FOR THE STUDENT ID IN C++ USING TEXT FILES?*

Text File Content:

ID G1 G2 G3
200 20 20 20
30 30 30 30
400 40 40 40
25 25 25 25
78 78 78 78
666 66 6 66
777 77 100 77
420 77 88 99
1711 10 10 10
404 40 50 60
505 100 100 100

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

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

   system("cls");

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

   inputFile >> header;
   getline(inputFile, header);
   cout << header << endl;

   inputFile >> ID;
   inputFile >> exam1;
   inputFile >> exam2;
   inputFile >> exam3;

   while (getline(inputFile, studentData)) {

   }

   if (studentID == ID) {
       cout << ID << " " << exam1 << " " << exam2 << " " << exam3 << endl;
       cout << "FOUND!" << endl;
   }
   else {
       cout << "NOT FOUND!" << endl;
   }

  
   inputFile.close();

   system("pause");
}//ends studentStats() function

Answer 1

Please find the updated code below::::

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

using namespace std;

void studentStats() {
   ifstream inputFile;
   string studentData;
   string studentID;
   string ID, exam1, exam2, exam3;
   string header;
   system("cls");
   getline(inputFile, header,'\n');
   cout << "Enter a Student ID: ";
   cin>>studentID;
   string line;//for read line
   inputFile.open ("outFile.txt"); //name of file here. plz mention Complete path if file is not at root
   if (inputFile.is_open()) //if file opened
   {
       while( getline(inputFile, line,'\n') ) { //get row from text file
           stringstream ss(line); //stream to other variable
           ss >> ID;
           ss >> exam1;
           ss >> exam2;
           ss >> exam3;

           if (studentID == ID) {
               cout << "Student FOUND!" << endl;
               cout << ID << " " << exam1 << " " << exam2 << " " << exam3 << endl;
               return ;
           }
       }
       inputFile.close(); //close file
       cout<<"File scan done........"<<endl;
   }
   else //if file not found show the below message
   {
       cout << "Sorry, we could not find the file." << endl;
   }
   cout << "Student NOT FOUND!" << endl;
   inputFile.close();
   system("pause");
}//ends studentStats() function

int main(){
   studentStats();
   return 0;
}

text file

ID G1 G2 G3
200 20 20 20
30 30 30 30
400 40 40 40
25 25 25 25
78 78 78 78
666 66 6 66
777 77 100 77
420 77 88 99
1711 10 10 10
404 40 50 60
505 100 100 100

output: