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how to handle variable length argument in c++

Rich Ratel on Dec 15, 2020

#include <cstdarg>
#include <iostream>
 
using namespace std;
 
// this function will take the number of values to average
// followed by all of the numbers to average
double average ( int num, ... )
{
  va_list arguments;                     // A place to store the list of arguments
  double sum = 0;
 
  va_start ( arguments, num );           // Initializing arguments to store all values after num
  for ( int x = 0; x < num; x++ )        // Loop until all numbers are added
    sum += va_arg ( arguments, double ); // Adds the next value in argument list to sum.
  va_end ( arguments );                  // Cleans up the list
 
  return sum / num;                      // Returns the average
}
int main()
{
    // this computes the average of 13.2, 22.3 and 4.5 (3 indicates the number of values to average)
  cout<< average ( 3, 12.2, 22.3, 4.5 ) <<endl;
    // here it computes the average of the 5 values 3.3, 2.2, 1.1, 5.5 and 3.3
  cout<< average ( 5, 3.3, 2.2, 1.1, 5.5, 3.3 ) <<endl;
}

Source: www.cprogramming.com

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"how to handle variable length argument in c++" Code Answer's