Question

Write a function called productEven that takes as its parameter an input file. The function should read two integers and calculate the total product of only even numbers between them. Return the answer to the calling function.

c++ program

Answer 1

CODE:

#include <iostream>
#include <fstream>

using namespace std;

int produtEven(string filename);

int main() {
//calling the function
int output = produtEven("input.txt");
cout<<"Product returned by the function: "<<output<<endl;

}

int produtEven(string filename){
fstream file;
//opening both the input and output files
file.open(filename.c_str());
int a,b;
//getting the two numbers from the input file
file>>a;
file>>b;

int evenProd = 1;
for(int i=a;i<=b;i++){
//finding the product of all even numbers in the range
if(i%2 == 0){
evenProd *= i;
}
}
file.close();
//returning the product
return evenProd;
}

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CODE IMAGES:

- jhyhm.cpp - Code::Blocks 17.12 File Edit View Search Project Build Debug Fortran wxSmith Tools Tools+ Plugins DoxyBlocks Settings Help <global produtEven(string filename) : int . Q QSC Start here x jhvhm.cpp X #include <iostream> #include <fstream> 1 2 3 4 5 6 using namespace std; int produtEven (string filename); 7 8 9 int main() { // calling the function int output = produtEven ("input.txt"); cout<<"Product returned by the function: "<output<<endl; 10 11 12 13 :) Lint produtEven (string filename) { fstream file; //opening both the input and output files file.open(filename.c_str()); int a,b; //getting the two numbers from the input file file>>a; file >>b; 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 int evenProd = 1; for (int i=a;i<=b;i++) { //finding the product of all even numbers in the range if(i%2 == 0) { even Prod *= i; } } 32 33 file.close(); //returning the product return evenProd; } 34 35

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OUTPUT:

- х C:\Users\Win10\Documents\jhvhm.exe Product returned by the function: 645120 execution time : 0.263 s Process returned 0 (0x0) Press any key to continue.

input.txt:

input.txt - Notepad Х File Edit Format View Help 2 15

2 15

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Thank You!