C Program on two-dimensional array initialized at run time

Problem

Calculate the sum and product of all elements in an array by using the run-time compilation.

Solution

A two-dimensional array is used in situations where a table of values have to be stored (or) in matrices applications

The syntax is as follows −

datatype array_ name [rowsize] [column size];

For example, int a[5] [5];

Number of elements in array = rowsize *columnsize = 5*5 = 25

Example

Following is the C program to calculate the sum and product of all elements in an array by using the run-time compilation −

 Live Demo

#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's A and B using for loop//    printf("Enter elements into the array A: 
");    for(i=0;i<2;i++){       for(j=0;j<3;j++){          printf("A[%d][%d] :",i,j);          scanf("%d",&A[i][j]);       }       printf("
");    }    for(i=0;i<2;i++){       for(j=0;j<3;j++){          printf("B[%d][%d] :",i,j);          scanf("%d",&B[i][j]);       }       printf("
");    }    //Calculating sum and printing output//    printf("Sum array is : 
");    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("
");    }    //Calculating product and printing output//    printf("Product array is : 
");    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("
");    } }

Output

When the above program is executed, it produces the following result −

Enter elements into the array A: A[0][0] :12 A[0][1] :23 A[0][2] :03 A[1][0] :25 A[1][1] :34 A[1][2] :01 B[0][0] :03 B[0][1] :46 B[0][2] :23 B[1][0] :01 B[1][1] :24 B[1][2] :32 Sum array is: 15    69    26 26    58    33 Product array is: 36    1058   69 25    816    32