Question

C++ Quesetion

In this exercise, you are to modify the Classify Numbers programming example in this chapter. As written, the program inputs the data from the standard input device (keyboard) and outputs the results on the standard output device (screen). The program can process only 20 numbers. Rewrite the program to incorporate the following requirements:

a. Data to the program is input from a file of an unspecified length; that is, the program does not know in advance how many numbers are in the file.

b. Save the output of the program in a file.

c. Modify the function getNumber so that it reads a number from the input file (opened in the function main), outputs the number to the output file (opened in the function main), and sends the number read to the function main. Print only 10 numbers per line.

d. Have the program find the sum and average of the numbers.

e. Modify the function printResult so that it outputs the final results to the output file (opened in the function main). Other than outputting the appropriate counts, this new definition of the function printResult should also output the sum and average of the numbers.

The input file "Data.txt":

43 67 82 0 35 28 -64 7 -87 0 0 0 0 12 23 45 7 -2 -8 -3 -9 4 0

1 0 -7 23 -24 0 0 12 62 100 101 -203 -340 500 0 23 0 54 0 76

Answer 1

//do comment if any problem arises or modification needed
//Code
#include <iostream>
#include <fstream>
using namespace std;
//this function reads a number from input file and writes it to output file and returns it
int getNumber(ifstream &input, ofstream &output)
{
static int count;
count++;
int number;
input >> number;
output << number << " ";
//10 number per line
if (count == 10)
{
output << endl;
count = 0;
}
return number;
}
//this function returns sum of given array
int find_sum(int *data, int n)
{
int sum = 0;
for (int i = 0; i < n; i++)
sum += data[i];
return sum;
}
//this function returns average of given array
float find_average(int *data, int n)
{
int total = find_sum(data, n);
return float(total) / n;
}
//this function prints result to file output.txt
void printResult(ifstream &input, ofstream &output)
{
int count = 0;
int data[1000];
//read data from input file
while (input)
{
data[count++] = getNumber(input, output);
}
output << endl;
//output count of numbers
output << "Count: " << count << endl;
//output sum
output << "Sum: " << find_sum(data, count) << endl;
//output average
output << "Average: " << find_average(data, count);
}
int main()
{
//name of input file
string infile = "Data.txt";
//name of output file
string outfile = "output.txt";
//open input file
ifstream input(infile);
//open output file
ofstream output(outfile);
//failed to open input file
if (!input.is_open())
{
cout << "Can't open Data.txt";
exit(0);
}
//failed to open output file
if (!output.is_open())
{
cout << "Can't open output.txt";
exit(0);
}
printResult(input, output);
//close output file
output.close();
//close input file
input.close();
}

Data.txt:

Output file output.txt: