Matrix programming in C language

This program is written totally with pointer, where rows and columns are allocated dynamically.
There are 3 sets of array with equal rows and columns. The program generate automatic values for first 2 array by using rand() function. Then it uses 2 functions which are also defined. One is to add the 2 matrix and assign the result into a third and another subtract 2 matrix and assign the result into the third.

Here is the program.

#include<stdio.h>

#include<conio.h>

#include<malloc.h>
#include<stdlib.h>

void printArray(int **arr,int row,int col)
{


    int i,j;


    for(i=0;i<row;i++)
    {


        for(j=0;j<col;j++)
          printf("%d\t",*(*(arr + i) + j));
        printf("\n\n");


   }
}

void sum(int **retarr,int **farr,int **sarr,int row,int col)
{


    int i,j;


    for(i=0;i<row;i++)
        for(j=0;j<col;j++)
            *(*(retarr + i) + j)=*(*(farr + i) + j) + *(*(sarr + i) + j);

}

void diff(int **retarr,int **farr,int **sarr,int row,int col)
{


    int i,j;


    for(i=0;i<row;i++)
        for(j=0;j<col;j++)
            *(*(retarr + i) + j)=*(*(farr + i) + j) - *(*(sarr + i) + j);

}

void main()
{


    int **firstArr;
    int **secondArr;
    int **resultArr;
    int col,row;
    int i,j;


    printf("\nEnter number of columns : ");
    scanf("%d",&col);
   
    printf("\nEnter number of rows : ");
    scanf("%d",&row);
   
    firstArr = (int **)malloc(row);
    secondArr = (int **)malloc(row);
    resultArr = (int **)malloc(row);

    for(i=0;i<row;i++)
    {
   
        *(firstArr+i) = (int *)malloc(col);
        for(j=0;j<col;j++)
          *(*(firstArr + i) + j) = rand()%100+1;
         
    }

    for(i=0;i<row;i++)
    {

        *(secondArr+i) = (int *)malloc(col);
        for(j=0;j<col;j++)
          *(*(secondArr + i) + j) = rand()%100+1;

    }

    for(i=0;i<row;i++)
        *(resultArr+i) = (int *)malloc(col);

    diff(resultArr,firstArr,secondArr,row,col);

    printArray(firstArr,row,col);
    printf("\n........................\n");
    printArray(secondArr,row,col);
    printf("\n........................\n");
    printArray(resultArr,row,col);
}

 #clanguage #cprogramming #programminginc #turboc #matrix