2d array multiplication c

1double[][] c = new double[N][N];
2for (int i = 0; i < N; i++)
3{
4 for (int j = 0; j < N; j++)
5 	{
6 for (int k = 0; k < N; k++)
7 		{
8		 c[i][j] += a[i][k] * b[k][j];
9 		}
10 	}
11}
12

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

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