0

When i try running this code i get an error 'Floating Point Exception'. I dont know why this is happening.

```
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <pthread.h>
long long int number_of_tosses, number_of_threads, number_in_circle = 0;
pthread_mutex_t mutex;
void *mc(void* rank)
{
double x, y, distance_squared, pi_estimate;
int toss;
long long int n;
n = number_of_tosses/number_of_threads;
srandom((unsigned)time(NULL));
for ( toss=0 ; toss< n ; toss++) {
pthread_mutex_lock(&mutex);
x = 2*(rand()/((double)RAND_MAX)) - 1.0;
y = 2*(random()/((double)RAND_MAX)) - 1.0;
distance_squared = x * x + y * y;
if(distance_squared <= 1)number_in_circle++;
pthread_mutex_unlock(&mutex);
}
// pi_estimate = 4 * number_in_circle/((double) number_of_tosses);
/*
if(rank == 0) {
printf("Thread %d: pi estimate = %f\n", (int)rank, pi_estimate);
} */
return NULL;
}
int main(){
long thread;
double pi_estimate;
int number_of_threads;
pthread_t* thread_handles;
printf("Enter number of tosses: \n");
scanf("%lld", &number_of_tosses);
printf("Enter number of threads: ");
scanf("%d", &number_of_threads);
thread_handles = malloc (number_of_threads * sizeof(pthread_t));
pthread_mutex_init(&mutex, NULL);
for(thread = 0; thread < number_of_threads; thread++)
pthread_create(&thread_handles[thread], NULL, mc, (void*) thread);
// printf("Main thread \n");
for(thread = 0; thread < number_of_threads; thread++)
pthread_join(thread_handles[thread], NULL);
pthread_mutex_destroy(&mutex);
free(thread_handles);
if(thread == 0) {
pi_estimate = 4 * number_in_circle/((double) number_of_tosses);
printf("Pi estimate: %f\n", pi_estimate);
}
return 0;
}
```