Use variable-length array function parameters to calculate on two dimensional array - C Array

C examples for Array:Multidimensional Arrays

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Description

Use variable-length array function parameters to calculate on two dimensional array

Demo Code

#include <stdio.h>
#define ROWS 3//from w w  w . ja  va  2 s . c o  m
#define COLUMNS 5

double compute_row_average(double *array, int cols);
double compute_array_average(int rows, int cols, double array[ROWS][COLUMNS]);
double largest_value(int rows, int cols, double array[ROWS][COLUMNS]);

int main(void)
{
   double data[ROWS][COLUMNS];

   for (int i = 0; i < ROWS; i++) {
      printf("Enter set of %d doubles: ", COLUMNS);
      for (int j = 0; j < COLUMNS; j++) {
         scanf("%lf", data[i] + j);
      }
   }
   printf("Row Averages:\n");
   for (int i = 0; i < ROWS; i++) {
      printf("\tAverage for row %d: %.3f\n", i + 1, compute_row_average(data[i], COLUMNS));
   }
   printf("Average for entire array: %.3f\n", compute_array_average(ROWS, COLUMNS, data));
   printf("Maximum array value: %.3f\n", largest_value(ROWS, COLUMNS, data));
   return 0;
}

double compute_row_average(double *array, int cols) {
   double total = 0;
   for (int i = 0; i < cols; i++)
      total += array[i];

   return total / cols;
}

double compute_array_average(int rows, int cols, double array[ROWS][COLUMNS]) {
   double total = 0;
   for (int i = 0; i < rows; i++)
      for (int j = 0; j < cols; j++)
         total += array[i][j];

   return total / (rows * cols);
}

double largest_value(int rows, int cols, double array[ROWS][COLUMNS]) {
   double max = array[0][0];
   for (int i = 0; i < rows; i++)
      for (int j = 0; j < cols; j++)
         if (array[i][j] > max)
            max = array[i][j];

   return max;
}

Result


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