Question

Assume you have the following declaration (in main) : int num[10] [7]; Assume that array num is filled completely. Write functions to perform each of the following: a) A function that prints all elements in the array that are greater than 10 or less than 50. b) A function that finds the largest number in the array and returns its subscript. c) A function that finds and returns the average of all the numbers in the array. d) A function that print the entire array in a new table, but starting with the last row and proceeding in reverse order to the first.

Answer 1

/* C program that demonstrates the functions written in the program and display the results of the functions on the console window. */

//main.c
#include<stdio.h>
#include<stdlib.h>
#include<conio.h>
#include<math.h>

//define constant values for number of rows and number of cloumns
#define ROWS 10
#define COLS 7

//funciton prototypes

void fillArray(int num[][COLS]);
void printMoreThan10LessThan50(int num[][COLS]);
void display(int num[][COLS]);
int finLargest(int nums[][COLS], int &rowIndex ,int&colIndex);
void displayReverse(int nums[][COLS]);
double finAverage(int nums[][COLS]);
int main()
{

   //funciton to generate a random values
   srand(time_t(0));

   int largestValue=0;
   //a 2d array of integer type
   int nums[ROWS] [COLS];

   printf("Filling array with some random numbers\n");
   //function calling
   fillArray(nums);
   printf("Dsiplay the array values\n");
   //function calling
   display(nums);
   printf("Printing elements >10 or <50\n");
   //function calling
   printMoreThan10LessThan50(nums);
   int rowIndex =0;
   int colIndex=0;
   //function calling
   largestValue=finLargest(nums, rowIndex ,colIndex);
   printf("\n\nLargest Element : %d\n",largestValue);
   printf("Largest Element row index: %d\n",rowIndex);
   printf("Largest Element column index: %d\n",colIndex);
   //function calling
   printf("\n\nAverage of array values: %.2f\n", finAverage(nums));
   printf("\n\nPrinting 2D array from last row to first row\n");
   //function calling
   displayReverse( nums);

   getch();
   return 0;

}
/*Helper function that fills the array with random values in a range of 1 to 100 */
void fillArray(int nums[][COLS])
{
   int r;
   int c;
   for(r=0;r<ROWS;r++)
   {
       for(c=0;c<COLS;c++)
       {
           nums[r][c]=rand()%100+1;
       }
   }
}
/*d) A function that print the entire array in a new table,
starting with the last row and proceeding in reverse order to the first.*/
void displayReverse(int nums[][COLS])
{
   int r;
   int c;
   for(r=ROWS-1;r>=0;r--)
   {
       for(c=COLS-1;c>=0;c--)
       {
           printf("%-5d",nums[r][c]);
       }
       printf("\n");
   }
}
//Helper function to display the values in the array,nums
void display(int nums[][COLS])
{
   int r;
   int c;
   for(r=0;r<ROWS;r++)
   {
       for(c=0;c<COLS;c++)
       {
           printf("%-5d",nums[r][c]);
       }
       printf("\n");
   }
}
/*a) A function that prints all elements in the array that are greater than 10 or less than 50.*/
void printMoreThan10LessThan50(int nums[][COLS])
{
   int r;
   int c;

   for(r=0;r<ROWS;r++)
   {
       for(c=0;c<COLS;c++)
       {
           if(nums[r][c]>10 && nums[r][c]<50)
               printf("%-5d",nums[r][c]);
       }
   }
}
//b) A function that finds the largest number in the array and returns its subscript.
int finLargest(int nums[][COLS], int &rowIndex ,int&colIndex)
{
   int r;
   int c;
   int largestElement=nums[0][0];
   rowIndex=0;
   colIndex=0;
   for(r=0;r<ROWS;r++)
   {
       for(c=0;c<COLS;c++)
       {
           if(nums[r][c]> largestElement)
           {
               largestElement=nums[r][c];
               rowIndex=r;
               colIndex=c;
           }             
       }
   }

   return largestElement;
}
//c) A function that finds and returns the average of all the numbers in the array.
double finAverage(int nums[][COLS])
{
   int r;
   int c;
   double total=0;
   double average=0;
   for(r=0;r<ROWS;r++)
   {
       for(c=0;c<COLS;c++)
       {
           total=total+nums[r][c];
       }
   }
   average=total/(ROWS*COLS);
   return average;
}

Sample Output: