Archive:Matrix multiplication using C

<source lang="c">/* Program to implement matrix multiplication. */ /* Performed by Milan. */

1. include <stdio.h>
2. include <conio.h>

void main() { int a[10][10], b[10][10], c[10][10]; int i, j, m, n, x, y, k; clrscr();

/* Entering values for matrix a...*/ printf ("\n Enter the rows and columns of a: "); scanf ("%d%d", &m, &n);

for (i = 0; i < m; i++) { for (j = 0; j < n; j++) { printf (" a[%d][%d] = ", (i+1), (j+1)); scanf ("%d", &a[i][j]); } printf ("\n"); }

/* Entering values for matrix b... */ printf ("\n Enter the rows and columns of b: "); scanf ("%d%d", &x, &y);

for (i = 0; i < x; i++) { for (j = 0; j < y; j++) { printf (" b[%d][%d] = ", (i+1), (j+1)); scanf ("%d", &b[i][j]); } printf ("\n"); }

/* Calculations */ if ( n != x) { printf ("\n Error!! Rows of a don't match with columns of b."); printf ("\n Multiplication Impossible."); getch(); exit(0); } else { for (i = 0; i < m; i++) { for (j = 0; j < y; j++) { c[i][j] = 0; for (k = 0; k < n; k++) { c[i][j]+=a[i][k]*b[k][j]; } } } }

/* Output */ printf ("\n The resultant c is:\n"); for (i = 0; i < m; i++) { for (j = 0; j < y; j++) { printf (" c[%d][%d] = %d", (i+1), (j+1), c[i][j]); } printf ("\n"); }

getch(); } /* Output:

Enter the rows and columns of a: 2 2
a[1][1] = 1
a[1][2] = 2

a[2][1] = 3
a[2][2] = 4

Enter the rows and columns of b: 2 2
b[1][1] = 2
b[1][2] = 1

b[2][1] = 2
b[2][2] = 2

The resultant c is:
c[1][1] = 6 c[1][2] = 5
c[2][1] = 14 c[2][2] = 11

• /

</source>