ccplusplus.com: matrix multiplication in C

Tuesday, September 13, 2011

matrix multiplication in C

/******************************************************
 * File     :   matrix-multiplication.c
 * Author   :   Saurabh Gupta
 * Desc     :   matrix multiplication using arrays in c
 * Source   :   http://saurabhgupta0527.blogspot.com/
 * Created  :   PM 07:30 13 September 2011
 *****************************************************/
 #include <stdio.h>
 
 int main (int argc, char **argv) {
    int firstMatrix[10][10], 
        secondMatrix[10][10], 
        addedMatrix[10][10], 
        multipliedMatrix[10][10];
    int nFirstMatrixRow, 
        nFirstMatrixColumn, 
        nSecondMatrixRow, 
        nSecondMatrixColumn;
    int i, j, k, nUserChoice, nMultiply, nAdd;
    
    printf ("XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n");
    printf ("XXXXX     Matrix Multiplication Program     XXXXX\n");
    printf ("XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n");
    printf ("\nMaximum Row and Column limit : 10\n");
    printf("\nNumber of rows and column of first matrix  : ");
    scanf("%d%d", &nFirstMatrixRow, &nFirstMatrixColumn);
    printf("\nNumber of rows and column of second matrix : ");
    scanf("%d%d",&nSecondMatrixRow,&nSecondMatrixColumn);
    
    if(nSecondMatrixRow == nFirstMatrixColumn) {
        printf("\nEnter rows and columns of First matrix");
        printf("Row wise\n");
        for(i = 0; i < nFirstMatrixRow; i++) {
            for(j = 0; j<nFirstMatrixColumn; j++) {
                scanf("%d", &firstMatrix[i][j]);
            }
        }
        
        printf("\nFirst Matrix is:\n");
        for(i = 0; i < nFirstMatrixRow; i++) {
            for(j = 0; j < nFirstMatrixColumn; j++) {
                printf("%d\t",firstMatrix[i][j]);
            }
            printf("\n");
        }
        printf("\nEnter rows and columns of Second matrix \n");
        printf("Row wise\n");
        for(i=0;i<nSecondMatrixRow;i++) {
            for(j=0;j<nSecondMatrixColumn;j++) {
                scanf("%d",&secondMatrix[i][j]);
            }
        }
        printf("\nSecond matrixis:\n");
        for(i = 0; i<nSecondMatrixRow; i++) {
            for(j = 0; j<nSecondMatrixColumn; j++) {
                printf("%d\t",secondMatrix[i][j]);
            }
            printf("\n");
        }

printf("\nThe result of the multiplication is as follows:\n");
        /*a11xA11+a12xA21+a13xA31 a11xA12+a12xA22+a13xA32 a11xA13+a12xA23+a13xA33*/
        for(i=0;i<nFirstMatrixRow;i++) {
            for(j=0;j<nSecondMatrixColumn;j++) {
                multipliedMatrix[i][j]=0;
                for(k=0;k<nFirstMatrixRow;k++) {
                   multipliedMatrix[i][j]+=firstMatrix[i][k]*secondMatrix[k][j];
                   /*multipliedMatrix[0][0]=firstMatrix[0][0]*secondMatrix[0][0]+firstMatrix[0][1]*secondMatrix[1][0]+firstMatrix[0][2]*secondMatrix[2][0];*/
                }
                printf("%d\t",multipliedMatrix[i][j]);
            }
            printf("\n");
        }
    }
    else {
        printf("Matrix multiplication cannot be done");
    }
    printf ("XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n");
    return 0;
 }
/*
 * OUTPUT
 *
 [sgupta@rhel54x64 tmp]$ gcc matrix-multiplication.c -o matrix-multiplication
 [sgupta@rhel54x64 tmp]$ ./matrix-multiplication
 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
 XXXXX     Matrix Multiplication Program     XXXXX
 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Maximum Row and Column limit : 10

Number of rows and column of first matrix  : 2 2

Number of rows and column of second matrix : 2 2

Enter rows and columns of First matrixRow wise
 1
 1
 1
 1

First Matrix is:
 1       1
 1       1

Enter rows and columns of Second matrix
 Row wise
 2
 2
 2
 2

Second matrixis:
 2       2
 2       2

The result of the multiplication is as follows:
 4       4
 4       4
 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
 [sgupta@rhel54x64 tmp]$
 */

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Tuesday, September 13, 2011

matrix multiplication in C

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