Question

Write scores of 20 students on a quiz to a file. The file should be named scores.txt. The scores should be random numbers between 0-10. Next, read the scores from scores.txt and double them and print the scores to screen. c++

Answer 1

Program:

#include <iostream>

#include <ctime>

#include <iomanip>

#include <fstream>

using namespace std;

int main()

{

srand(time(0)); //seed random number generator

int scores[20],a; // variable declaration

ifstream infile; // input file declaration

ofstream outFile("scores.txt"); // output file declaration

infile.open("scores.txt"); // Syntax for open the file

for(int i=0;i<20;i++)

{

scores[i] = rand() %11; // random number between 0 and 10

outFile <<scores[i]<<endl; // write the scores into the file

}

cout<<"Double the scores in the file:"<<endl;

while (infile >> a) // read the file content

{

int doubleScore=2*a;

cout<<doubleScore<<" "; // store the values in file

}

infile.close(); // close the file

cout<<endl;

return 0;

}

Output:

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