Question

write C program that receives n from the user and creates two n x n matrices (e.g. A and B). The program receives the data values of each matrix from the user and performs matrix multiplication and addition (e.g. C = A x B and D = A + C). The values of result matrices ( C and D) are shown on the screen.

Answer 1

Hello, here is the completed code you wanted. Every important statement is explained using comments. Please check and let me know if you have any doubts. Thanks.

CODE

#include <stdio.h>   

//main function
int main()
{
   //variables and arrays
   int n, i, j, k, first_matrix[100][100], second_matrix[100][100], sum[100][100], product[100][100], temp = 0;
  
   //prompt for n
   printf("Enter n: ");
  
   //reading n
   scanf("%d", &n);
  
   //prompt for first matrix values
   printf("Enter the elements of first matrix\n");   
  
   //rows
   for(i = 0; i < n; i++)
   {
       //columns
       for(j = 0; j < n; j++)
       {
           //reading matrix data
           scanf("%d", &first_matrix[i][j]);
       }
   }
  
   //prompt for first matrix values
   printf("Enter the elements of second matrix\n");   
  
   //rows
   for(i = 0; i < n; i++)
   {
       //columns
       for(j = 0; j < n; j++)
       {
           //reading matrix data
           scanf("%d", &second_matrix[i][j]);
       }
   }
  
   //performing addition
   for(i = 0; i < n; i++)
   {
       for(j = 0; j < n; j++)
       {
           //adding data and store in matrix sum
           sum[i][j] = first_matrix[i][j] + second_matrix[i][j];
       }
   }
  
   //performing multiplication
   for(i = 0; i < n; i++)
   {
       for(j = 0; j < n; j++)
       {
           for(k = 0; k < n; k++)
           {
               //multiplying data
               temp = temp + first_matrix[i][k] * second_matrix[k][j];
           }
           //store in matrix product
           product[i][j] = temp;
           temp = 0;
       }
   }
  
   //printing added matrix
   printf("Addition:\n");
  
   //rows
   for(i = 0; i < n; i++)
   {
       //columns
       for(j = 0; j < n; j++)
       {
           //printing data
           printf("%d\t", sum[i][j]);
       }
       printf("\n");
   }
  
   //printing multiplied matrix
   printf("Multiplication:\n");
  
   //rows
   for(i = 0; i < n; i++)
   {
       //columns
       for(j = 0; j < n; j++)
       {
           //printing data
           printf("%d\t", product[i][j]);
       }
       printf("\n");
   }
  
   return 0;
}

OUTPUT

CODE SCREEN SHOT