In C programming, working with 2D arrays at runtime

Question

Write a C program that uses runtime compilation to calculate the sum and product of all elements in a two-dimensional array.

Solution

• Run-time compilation or initialization is also known as dynamic allocation. Allocating memory at execution time (runtime) is called dynamic memory allocation.

• The functions calloc() and malloc() support dynamic memory allocation.

• The functions calloc() and malloc() support dynamic memory allocation. p>

In this program, we will calculate the sum of all elements and the product of all elements of a 2D array at runtime.

Logic used to calculate the sum of all elements in a two-dimensional array-

printf("Sum array is : </p><p>");
for(i=0;i<2;i++){
   for(j=0;j<3;j++){
      sum[i][j]=A[i][j]+B[i][j];
      printf("%d\t",sum[i][j]);
   }
   printf("</p><p>");
}

Logic used to calculate the product of all elements in a two-dimensional array-

printf("Product array is : </p><p>");
for(i=0;i<2;i++){
   for(j=0;j<3;j++){
      product[i][j]=A[i][j]*B[i][j];
      printf("%d\t",product[i][j]);
   }
   printf("</p><p>");
}
}

Example

Example demonstration

#include<stdio.h>
void main(){
   //Declaring the array - run time//
   int A[2][3],B[2][3],i,j,sum[i][j],product[i][j];
   //Reading elements into the array&#39;s A and B using for loop//
   printf("Enter elements into the array A: </p><p>");
   for(i=0;i<2;i++){
      for(j=0;j<3;j++){
         printf("A[%d][%d] :",i,j);
         scanf("%d",&A[i][j]);
      }
      printf("</p><p>");
   }
   for(i=0;i<2;i++){
      for(j=0;j<3;j++){
         printf("B[%d][%d] :",i,j);
         scanf("%d",&B[i][j]);
      }
      printf("</p><p>");
   }
   //Calculating sum and printing output//
   printf("Sum array is : </p><p>");
   for(i=0;i<2;i++){
      for(j=0;j<3;j++){
         sum[i][j]=A[i][j]+B[i][j];
         printf("%d\t",sum[i][j]);
      }
      printf("</p><p>");
   }
   //Calculating product and printing output//
   printf("Product array is : </p><p>");
   for(i=0;i<2;i++){
      for(j=0;j<3;j++){
         product[i][j]=A[i][j]*B[i][j];
         printf("%d\t",product[i][j]);
      }
      printf("</p><p>");
   }
}

Output

Enter elements into the array A:
A[0][0] :A[0][1] :A[0][2] :
A[1][0] :A[1][1] :A[1][2] :
B[0][0] :B[0][1] :B[0][2] :
B[1][0] :B[1][1] :B[1][2] :
Sum array is :
000
000
Product array is :
000
000

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