matrix addition in c

1//This program is for matrix addition by programiz.com
2#include <stdio.h>
3int main() {
4    int r, c, a[100][100], b[100][100], sum[100][100], i, j;
5    printf("Enter the number of rows (between 1 and 100): ");
6    scanf("%d", &r);
7    printf("Enter the number of columns (between 1 and 100): ");
8    scanf("%d", &c);
9
10    printf("\nEnter elements of 1st matrix:\n");
11    for (i = 0; i < r; ++i)
12        for (j = 0; j < c; ++j) {
13            printf("Enter element a%d%d: ", i + 1, j + 1);
14            scanf("%d", &a[i][j]);
15        }
16
17    printf("Enter elements of 2nd matrix:\n");
18    for (i = 0; i < r; ++i)
19        for (j = 0; j < c; ++j) {
20            printf("Enter element a%d%d: ", i + 1, j + 1);
21            scanf("%d", &b[i][j]);
22        }
23
24    // adding two matrices
25    for (i = 0; i < r; ++i)
26        for (j = 0; j < c; ++j) {
27            sum[i][j] = a[i][j] + b[i][j];
28        }
29
30    // printing the result
31    printf("\nSum of two matrices: \n");
32    for (i = 0; i < r; ++i)
33        for (j = 0; j < c; ++j) {
34            printf("%d   ", sum[i][j]);
35            if (j == c - 1) {
36                printf("\n\n");
37            }
38        }
39
40    return 0;
41}
42

1#include <stdio.h>
2int main(){
3int row, column, mat1[100][100], mat2[100][100], sum[100][100], i, j;
4printf("Enter the number of rows and columns : \n");
5scanf("%d %d", &row, &column);
6printf("\nInput Matrix 1 elements : ");
7for(i=0; i<row; ++i)
8for(j=0; j<column; ++j)
9{
10scanf("%d",&mat1[i][j]);
11}
12printf("\nMatrix 1\n");
13for(i=0;i<row;i++)
14{
15for(j=0;j<column;j++)
16{
17printf("%d",mat1[i][j]);
18}
19printf("\n");
20}
21
22printf("\nInput Matrix 2 elements : ");
23for(i=0; i<row; ++i)
24for(j=0; j<column; ++j)
25{
26scanf("%d", &mat2[i][j]);
27}
28printf("\nMatrix 2\n");
29for(i=0;i<row;i++)
30{
31for(j=0;j<column;j++)
32{
33printf("%d",mat1[i][j]);
34}
35printf("\n");
36}
37// Adding Two matrices
38printf("\nAdded Matrix\n");
39for(i=0;i<row;++i)
40for(j=0;j<column;++j)
41{
42sum[i][j]=mat1[i][j]+mat2[i][j];
43}
44
45// print the result
46
47for(i=0;i<row;++i)
48for(j=0;j<column;++j)
49{
50printf("%d ",sum[i][j]);
51
52if(j==column-1)
53{
54printf("\n");
55}
56}
57
58return 0;
59}
60/*©VinCoD*/

1#include <stdio.h>
2void enterData(int first[][10], int second[][10], int r1, int c1, int r2, int c2);
3void multiplyMatrices(int first[][10], int second[][10], int multResult[][10], int r1, int c1, int r2, int c2);
4void display(int mult[][10], int r1, int c2);
5
6int main() {
7    int first[10][10], second[10][10], mult[10][10], r1, c1, r2, c2;
8    printf("Enter rows and column for the first matrix: ");
9    scanf("%d %d", &r1, &c1);
10    printf("Enter rows and column for the second matrix: ");
11    scanf("%d %d", &r2, &c2);
12
13    // Taking input until columns of the first matrix is equal to the rows of the second matrix
14    while (c1 != r2) {
15        printf("Error! Enter rows and columns again.\n");
16        printf("Enter rows and columns for the first matrix: ");
17        scanf("%d%d", &r1, &c1);
18        printf("Enter rows and columns for the second matrix: ");
19        scanf("%d%d", &r2, &c2);
20    }
21
22    // Function to take matrices data
23    enterData(first, second, r1, c1, r2, c2);
24
25    // Function to multiply two matrices.
26    multiplyMatrices(first, second, mult, r1, c1, r2, c2);
27
28    // Function to display resultant matrix after multiplication.
29    display(mult, r1, c2);
30
31    return 0;
32}
33
34void enterData(int first[][10], int second[][10], int r1, int c1, int r2, int c2) {
35    printf("\nEnter elements of matrix 1:\n");
36
37    for (int i = 0; i < r1; ++i) {
38        for (int j = 0; j < c1; ++j) {
39            printf("Enter a%d%d: ", i + 1, j + 1);
40            scanf("%d", &first[i][j]);
41        }
42    }
43    printf("\nEnter elements of matrix 2:\n");
44
45    for (int i = 0; i < r2; ++i) {
46        for (int j = 0; j < c2; ++j) {
47            printf("Enter b%d%d: ", i + 1, j + 1);
48            scanf("%d", &second[i][j]);
49        }
50    }
51}
52
53void multiplyMatrices(int first[][10], int second[][10], int mult[][10], int r1, int c1, int r2, int c2) {
54
55    // Initializing elements of matrix mult to 0.
56    for (int i = 0; i < r1; ++i) {
57        for (int j = 0; j < c2; ++j) {
58            mult[i][j] = 0;
59        }
60    }
61
62    // Multiplying first and second matrices and storing in mult.
63    for (int i = 0; i < r1; ++i) {
64        for (int j = 0; j < c2; ++j) {
65            for (int k = 0; k < c1; ++k) {
66                mult[i][j] += first[i][k] * second[k][j];
67            }
68        }
69    }
70}
71
72void display(int mult[][10], int r1, int c2) {
73
74    printf("\nOutput Matrix:\n");
75    for (int i = 0; i < r1; ++i) {
76        for (int j = 0; j < c2; ++j) {
77            printf("%d  ", mult[i][j]);
78            if (j == c2 - 1)
79                printf("\n");
80        }
81    }
82}
83