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Home| Questions|Q 55171
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asking_mitras
asking_mitrasBeginner
Asked: May 17, 20222022-05-17T19:40:37+05:45 2022-05-17T19:40:37+05:45In: —C & C#

How to read specific record number in .dat file in C++?

  1. Write a program to write records of 5 items in file ‘item.dat’. Item class should contain data members code and price.
  2. Write a program to read first, third and fifth record from the file “item.dat” and display them on monitor.
c++file handling
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    2 Answers

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    1. pandey Pandey
      2022-05-17T20:58:00+05:45Added an answer on May 17, 2022 at 8:58 pm
      This answer was edited.

      Cpp program to create items.dat file and insert data into IT:

      
      
      #include <iostream>
      #include <fstream>
      #include <string>
      using namespace std;
      int main()
      {
          ifstream inFile;
          ofstream outFile;
          string code;
          double price;
          inFile.open("item.dat");
          outFile.open("item.dat");
          for(int i=0;i<5;i++)
          {
              cout<<"Enter code and price: ";
              cin>>code>>price;
              outFile<<code<<" "<<price<<endl;
          }
          inFile.close();
          outFile.close();
          return 0;
      }

      Program to read first, third and fifth data from “items.dat” file:

      
      
      #include <iostream>
      #include <fstream>
      #include <string>
      using namespace std;
      int main()
      {
          ifstream inFile;
          string code;
          double price;
          inFile.open("item.dat");
          // function to read first item from file
          inFile>>code>>price;
          cout<<"First item: "<<code<<" "<<price<<endl;
          // function to read third item from file
          inFile>>code>>price;
          inFile>>code>>price;
          cout<<"Third item: "<<code<<" "<<price<<endl;
          // function to read fifth item from file
          inFile>>code>>price;
          inFile>>code>>price;
          inFile>>code>>price;
          cout<<"Fifth item: "<<code<<" "<<price<<endl;
          inFile.close();
          return 0;
      }
      
      
      Hope this helps you if this really helps you please upvote or select as best answer please it motivates to  research about question and answer the question.
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      • asking_mitras Beginner
        2022-05-18T11:26:01+05:45Replied to answer on May 18, 2022 at 11:26 am

        What if in the first program you had  written on the file as

        ********
        Item 1 record:

        Item Code: 12

        Item Price: 23.99

        and so on for all 5 items. How do you read the specific 1sr,3rd and 5th item?

         

        Btw, thanks for your response and the answer. It did help.

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