Question

Write a function with a variable number of arguments, that takes any number of integers as arguments and computes the average. Additionally write a main that calls this function at least twice on different numbers of arguments.

Can this be done in command line and c++

Answer 1

In this C++ program,

- We have defined a function named Average which accepts a variable number of arguments and then it calculates the average for those numbers and prints it to the terminal.

- In main, we are checking the functionality of the above-defined functions by calling the function with a different number of arguments.

(I believe that I made the code simple and understandable, If you still have any query, Feel free to drop me a comment)

Program:

#include <iostream>

#include <cstdarg>

using namespace std;

/* Defined a function named Average which takes variable number of arguments and

* calculates the average of those numbers and print it onto the console */

void Average(int size, ...)

{

//Defined a va_list type variable

va_list numberslist;

//Initialize all the elements into the numberlist of the type va_list

va_start(numberslist,size);

float average=0; //Defined for storing the average of all the values

//Iterating through all the elements and calculating the sum first

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

average=average+va_arg(numberslist,int);

//Calculating the average by dividing the sum of elements and number of elements

average=average/size;

//Printing the Average of all the elements

cout<<"The Average of the numbers is "<<average<<endl;

}

int main()

{

//NOTE: You cannot directly pass the values,You need to specify the count as well

//When using the concept of variable length argument

/*Calling the Function Average() with mentioned the count of integers(Mandatory) as

* as the first parameter and then passing that many number of integer value*/

Average(4,1,2,3,4);

Average(10,1,2,3,4,5,6,7,8,9,10);

Average(3,5,10,15);

Average(2,10,20);

}

main.cpp saved 1 #include <iostream> 2 #include <cstdarg> 3 using namespace std; 4 5 6 7 /* Defined a function named Average which takes variable number of arguments and * calculates the average of those numbers and print it onto the console */ void Average (int size, ...) { //Defined a va_list type variable va_list numberslist; 8 9 10 11 12 //Initialize all the elements into the numberlist of the type va_list va_start(numberslist, size); 13 14 15 float average=0; //Defined for storing the average of all the values 16 17 18 19 //Iterating through all the elements and calculating the sum first for(int i=0;i<size; i++) average-average+va_arg(numberslist, int); 1/ Calculating the average by dividing the sum of elements and number of elements average-average/size; 20 21 22 23 24 // Printing the average of all the elements cout<<"The Average of the numbers is "<<average<<endl; 25 26 } 27 28 29 30 int main() { //NOTE: You cannot directly pass the values, You need to specify the count as well // When using the concept of variable length argument 31 32 33 /*Calling the Function Average) with mentioned the count of integers (Mandatory) as as the first parameter and then passing that many number of integer value*/ 34 35 36 37 Average (4,1,2,3,4); Average (10,1,2,3,4,5,6,7,8,9,10); Average (3,5,10,15); Average (2,10,20); 38 39 40 }

Output:

> clang++-7 pthread -std=c++17 -o main main.cpp } ./main The Average of the numbers is 2.5 The Average of the numbers is 5.5 The Average of the numbers is 10 The Average of the numbers is 15