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# Program of Matrix-vector multiplication

Posted By: Easy Tutor     Category: C Programming     Views: 15853

## Code for Program of Matrix-vector multiplication in C Programming

```# include <stdio.h>
# include </usr/include/sys/types.h>
# include </usr/include/sys/shm.h>
# include </usr/include/sys/sem.h>
# include </usr/include/sys/ipc.h>
# include "forkjoin.h"
# include "sharedlib.h"
# include "spinlock.h"int main()
{
int arr1[10][10];  // Matrix Arrayint arr2[10];      // Vector Array - Singular Column Matrixint *ansArr;       // Multipication Answer Stored Here// It need to be sharedint shmid;       // For ansArrint r1,c1;         // Number of Rows and Columns of First Matrixint r2,c2=1;       // Number of Rows and Columns of Second Matrixint iCount,jCount;

int id;            // Stores Process IDint nproc;         // Number of Processesint sum;

printf("Enter Number of Rows of First Matrix :");
scanf("%d",&r1);

printf("Enter Number of Columns of First Matrix :");
scanf("%d",&c1);

printf("Enter Number of Rows of Second Matrix :");
scanf("%d",&r2);

if(c1!=r2)
{
printf("Matrix Multipication is not Possible ...");
exit(1);
}

// Initialize an Array
printf("\n\nEnter Values for Matrix ...\n");
for(iCount=0;iCount<r1;iCount++)
{
for(jCount=0;jCount<c1;jCount++)
{
printf("Enter Value for Arr1[%d][%d] :",iCount,jCount);
scanf("%d",&arr1[iCount][jCount]);
}
}
printf("\n\nEnter Values for Vector Matrix ...\n");
for(iCount=0;iCount<r2;iCount++)
{
printf("Enter Value for Arr2[%d] :",iCount);
scanf("%d",&arr2[iCount]);
}

ansArr=(int*)sshared(sizeof(int)*r1,&shmid);

nproc=r1;    // Processes for Each Row Multipication

id=process_fork(nproc);
sum=0;
for(iCount=0;iCount<c1;iCount++)
{
sum+=(arr1[id][iCount] * arr2[iCount]);
}
ansArr[id]=sum;
process_join(nproc,id);

printf("Array 1\n");

for(iCount=0;iCount<r1;iCount++)
{
for(jCount=0;jCount<c1;jCount++)
{
printf("%d\t",arr1[iCount][jCount]);
}
printf("\n");
}

printf("Array 2 (Vector Matrix) \n");
for(iCount=0;iCount<r1;iCount++)
{
printf("%d\n",arr2[iCount]);
}

printf("Matrix-Vector Multipication \n");
for(iCount=0;iCount<r1;iCount++)
{
printf("%d\n",ansArr[iCount]);
}

cleanup_memory(&shmid);

return 0;
}
```
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