# Sum of two matrices using two dimensional array in C

Matrix is the perfect example of a two-dimensional array. It has row and column. A row represents one dimension and column represents the second dimension. For example matrix[4][5], it has 4 rows, each row consisting 5 elements i.e matrix[0] has 5 elements, matrix[1] has 5 elements and so on. In this example, two matrices are added and the result is displayed. Addition is done with corresponding elements of individual matrix i.e. matrix1[0][0] is added with matrix2[0][0].

The complete source code and output are given here….(The code is also available on GitHub). Here are related articles about matrix operation.

**Source Code**

//Sum of two matrices using two dimensional array #include <stdio.h> #include <stdlib.h> int main(){ int matrix1[10][10], matrix2[10][10], sum[10][10], i, j, m,n,p,q; printf("Enter the order of first matrix: "); scanf("%d%d",&m,&n); printf("Enter the order of second matrix: "); scanf("%d%d",&p,&q); if(m!=p && n!=q){ printf("Order of matrix did not matched!!"); exit(0); } printf("Enter first matrix: \n"); for(i = 0 ; i < m; i++){ for(j = 0; j < n; j++) scanf("%d", &matrix1[i][j]); } printf("Enter second matrix: \n"); for(i = 0 ; i < p; i++){ for(j = 0; j < q; j++) scanf("%d", &matrix2[i][j]); } for(i = 0 ; i < m; i++){ for(j = 0; j < n; j++) sum[i][j] = matrix1[i][j] + matrix2[i][j]; } printf("The sum of the matrix is :\n"); for(i = 0 ; i < m; i++){ for(j = 0; j < n; j++){ printf("%d", sum[i][j]); printf("\t"); } printf("\n"); } return 0; }

The above program allocates the fixed memory to store the matrix. The program below shows the dynamic memory allocation to allocates the memory to store the matrix.

#include <stdio.h> #include <stdlib.h> int main(int argc, char *argv[]) { int rows, columns, i, j; int **matrix1, **matrix2; if (argc != 3) { printf("Usage: outputfile rows columns\n"); exit(1); } rows = atoi(argv[1]); columns = atoi(argv[2]); // allocate memory for matrices matrix1 = (int**) malloc (sizeof(int*) * columns); for (i = 0; i < columns; i++) { matrix1[i] = (int*) malloc(sizeof(int*) * rows); } matrix2 = (int**) malloc (sizeof(int*) * columns); for (i = 0; i < columns; i++) { matrix2[i] = (int*) malloc(sizeof(int*) * rows); } // get matrices from user printf("Enter the first matrix: \n"); for(i = 0 ; i < rows; i++) for(j = 0; j < columns; j++) scanf("%d", &matrix1[i][j]); printf("Enter the second matrix: \n"); for(i = 0 ; i < rows; i++) for(j = 0; j < columns; j++) scanf("%d", &matrix2[i][j]); // add two matrices for(i = 0 ; i < rows; i++){ for(j = 0; j < columns; j++) matrix2[i][j] = matrix1[i][j] + matrix2[i][j]; } // display the result printf("The sum of the matrix is :\n"); for(i = 0 ; i < rows; i++){ for(j = 0; j < columns; j++){ printf("%d ", matrix2[i][j]); } printf("\n"); } return 0; }

Thanks nice set of programs for beginners

Nice

I like it very much sir

Nice

I like it very much sir

nice

it is very easy to understand.

thank u.. sir

how can i write an algorithm for this problem ??? may i know sir

crystal clear

nice post . thank you