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Program to multiply two matrices using thread

Posted By: Easy Tutor     Category: C Programming     Views: 33017

Write a program to multiply two matrices using thread.

Code for Program to multiply two matrices using thread in C Programming

# include <stdio.h>
# include <pthread.h>

int MAT1[10][10];
int MAT2[10][10];
int MAT3[10][10];

int r1,c1,r2,c2;

void *thread_Multiply_Matrix(void *);

int main()
{
    pthread_t tid;    
    int iCount,jCount,kCount;
    
    printf("Enter Number of Rows For Matrix 1 :");
    scanf("%d",&r1);
    
    printf("Enter Number of Columns For Matrix 1 :");
    scanf("%d",&c1);
    
    for(iCount=0;iCount<r1;iCount++)
    {
        for(jCount=0;jCount<c1;jCount++)
        {
            printf("Enter Mat1[%d][%d] :",iCount,jCount);
            scanf("%d",&MAT1[iCount][jCount]);
        }
    }
    
    printf("\n");
    
    printf("Enter Numer of Rows For Matrix 2 :");
    scanf("%d",&r2);
    
    printf("Enter Number of Columns For Matrix 2 :");
    scanf("%d",&c2);
    
    for(iCount=0;iCount<r2;iCount++)
    {
        for(jCount=0;jCount<c2;jCount++)
        {
            printf("Enter Mat2[%d][%d] :",iCount,jCount);
            scanf("%d",&MAT2[iCount][jCount]);
        }
    }
    
    if(c1!=r2)
    {
        printf("Multipication of Matrix not Possible !!!");
    }
    else
    {
        for(iCount=0;iCount<r1;iCount=iCount+2)
        {
            for(jCount=0;jCount<c2;jCount=jCount+2)
            {
                MAT3[iCount][jCount]=0;
            }
        }
        
        pthread_create(&tid,NULL,thread_Multiply_Matrix,NULL);
        
        for(iCount=0;iCount<r1;iCount=iCount+2)
        {
            for(jCount=0;jCount<c2;jCount++)
            {
                for(kCount=0;kCount<c1;kCount++)
                {
                    MAT3[iCount][jCount]+=MAT1[iCount][kCount] * MAT2[kCount][jCount];
                }
            }
        }
        
        pthread_join(tid,NULL);
    }
    
    printf("\n Matrix 1 \n");
    
    for(iCount=0;iCount<r1;iCount++)
    {
        for(jCount=0;jCount<c1;jCount++)
        {
            printf("%d \t",MAT1[iCount][jCount]);
        }
        printf("\n");
    }    
    
    printf("\n Matrix 2 \n");
    
    for(iCount=0;iCount<r2;iCount++)
    {
        for(jCount=0;jCount<c2;jCount++)
        {
            printf("%d \t",MAT2[iCount][jCount]);
        }
        printf("\n");
    }    
    
    printf("\n Multipication of Matrix ...\n");
    
    for(iCount=0;iCount<r1;iCount++)
    {
        for(jCount=0;jCount<c2;jCount++)
        {
            printf("%d \t",MAT3[iCount][jCount]);
        }
        printf("\n");
    }    
    return 0;
}

void *thread_Multiply_Matrix(void *para)
{
    int iCount,jCount,kCount;
    for(iCount=1;iCount<r1;iCount=iCount+2)
        {
            for(jCount=0;jCount<c2;jCount++)
            {
                for(kCount=0;kCount<c1;kCount++)
                {                    
                    MAT3[iCount][jCount]+=MAT1[iCount][kCount] * MAT2[kCount][jCount];
                }
            }
        }
        
    printf("thread finished ...");
    pthread_exit(NULL);
}
  
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Easy Tutor author of Program to multiply two matrices using thread is from United States. Easy Tutor says

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  • Please put code inside [Code] your code [/Code].

 
Tashik Javed from United States Comment on: May 13
hey it displays an error

tashik@ubuntu:~$ gcc -o task prog.c
/tmp/ccrD6sb7.o: In function `main':
prog.c:(.text+0x22f): undefined reference to `pthread_create'
prog.c:(.text+0x304): undefined reference to `pthread_join'
collect2: ld returned 1 exit status


kindly help me

Isah Salisu from Turkey Comment on: Dec 24
please help me with a parallel program code for the multiplication of two 5x5 matrices by using drived data types.Choose 6 nodes in the run time and each row of the resultant matrix should be calculated by one of the nodes. Create your matrixes only in the master node and use drived data types in your program.

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