Write a function that returns the index of the largest value stored in an array of double - C Function

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Description

Write a function that returns the index of the largest value stored in an array of double

Demo Code

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

#define SIZE 10//from  ww w  .j a  va 2s .  c  o m

int index_of_max(double *arr, int arr_size);

int main(void)
{
  double test[SIZE];

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

  for (int i = 0; i < SIZE; i++)
    test[i] = rand() / (double) RAND_MAX;

  printf("%5s ", "Index");
  
  for (int i = 0; i < SIZE; i++)
    printf("| %6d ", i);
  
  printf("\n");
  
  printf("%5s ", "Value");
  
  for (int i = 0; i < SIZE; i++)
    printf("| %6.4f ", test[i]);
  
  printf("\n\n");

  // print results 
  printf("The maximum value occurs at index %d\n", index_of_max(test, SIZE));

  return 0;
}

int index_of_max(double *arr, int arr_size)
{
  // return index of max value in array of doubles
  int index_of_max = 0;
  for (int i = 1; i < arr_size; i++)
    if (*(arr + i) > *(arr + index_of_max))
      index_of_max = i;

  return index_of_max;
}

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