9.A program to calculate sum of n numbers using thread library

A program to calculate sum of n numbers using thread library. 

cskecode

//cskecode.blogspot.com

#include<stdio.h>

#include<unistd.h>

#include<sys/types.h>

#include<pthread.h>

int sum;

void *run(void *param);

int main(int argc, char *argv[]).

{

pthread_t tid;

pthread_attr_t attr;

if(argc !=2)

{

printf("Error !");

return 1;

}

if(atoi(argv[1])<0)

{

printf("no. Should be +ive");

return 1;

}

pthread_attr_init(&attri

pthread_create(&tid,&attr.run.arguri):

pthread_join(tid, NULL);

printf("Sum = %d in", sum);

}

void *run(void *param)

{

int i,upper;

sum=0 ;

upper=atoi(param);

if(upper>0)

{

for(i=1;i<=upper; ++i)

SUM+=i:

pthread_exit(0);

}

}
//cskecode.blogspot.com

Output: