让第二个线程为

Question

我有一个程序要求用户输入（数字= n）。然后创建一个线程来计算从1到n的总和。我现在想要创建其他线程以向用户输入数字n添加数字。然后，第二个线程计算1到n+1的总和，然后第三个线程将计算1到n+2的总和。

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

void * thread_calc(void *);
int TotalSum=0;

int main()
{
    int iNumber;
    pthread_t tid, tid2;
    printf("Enter Number Up to Which You want to Sum :");
    scanf("%d",&iNumber);    
    pthread_create(&tid,NULL,thread_calc,(void *) &iNumber);
    //pthread_create(&tid2,NULL,thread_calc,(void *)(&iNumber+1));

    pthread_join(tid,NULL);
    pthread_join(tid2,NULL);


    printf("Thread %d running, Final Sum is : %d \n", tid,TotalSum);

    pthread_create(&tid2,NULL,thread_calc,(void *) &iNumber+1);
    pthread_join(tid,NULL);
    printf("Thread %d running, Final Sum is : %d \n", tid2,TotalSum);


    //    return 0;
}

void *thread_calc(void *num)
{
    int *iNumber;
    iNumber=(int*)num;

    TotalSum = ((*iNumber + 1)* (*iNumber))/2;

    pthread_exit(NULL);    
}