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# Program to find the total no of prime numbers between 1 to n by using thread

Posted By: Easy Tutor     Category: C Programming     Views: 10864

## Code for Program to find the total no of prime numbers between 1 to n by using thread in C Programming

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

void * thread_sum(void *);
int TotalCount=0;
int iNumber;
pthread_mutex_t mVar=PTHREAD_MUTEX_INITIALIZER;

int main()
{
int iCount,jCount;
int threadPara;
int PrimeFlag=1;
pthread_t tid;
printf("Enter Number Up to Which You want to Count Prime Numbers :");
scanf("%d",&iNumber);
threadPara=iNumber/2 + 1;
pthread_create(&tid,NULL,thread_sum,(void *)&threadPara);
for(iCount=2;iCount<=iNumber/2;iCount=iCount++)
{
for(jCount=2;jCount<iCount;jCount++)
{
if(iCount%jCount==0)
{
PrimeFlag=0;
break;
}
}

if(PrimeFlag==1)
{
printf("[ %d ]  Main\n",iCount);
pthread_mutex_lock(&mVar);
TotalCount=TotalCount++;
pthread_mutex_unlock(&mVar);
}
else
{
PrimeFlag=1;
}
}

pthread_join(tid,NULL);

printf("Final Count is : %d \n",TotalCount);
return 0;
}

void *thread_sum(void *no)
{
int *ifrom,iCount,jCount;
int PrimeFlag=1;
ifrom=(int*)no;

for(iCount=*ifrom;iCount<=iNumber;iCount=iCount++)
{
for(jCount=2;jCount<iCount;jCount++)
{
if(iCount%jCount==0)
{
PrimeFlag=0;
break;
}
}

if(PrimeFlag==1)
{
printf("[ %d ] Thread\n",iCount);
pthread_mutex_lock(&mVar);
TotalCount++;
pthread_mutex_unlock(&mVar);
}
PrimeFlag=1;
}
pthread_exit(NULL);
}
```
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 Krupa Rajani from India Comment on: Sep 06 Above program is giving infinite output, not running as shown in screenshot

 Krupa Rajani from India Comment on: Sep 06 Above program is giving infinite output, not running as shown in screenshot

 Krupa Rajani from India Comment on: Sep 06 Above program is giving infinite output, not running as shown in screenshot

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