c multithreading sum from 0 to 1000

To sum numbers from 0 to 1000 using multithreading in C, you can follow these steps:

Step 1: Include the necessary libraries

Include the necessary libraries for multithreading in C. In this case, you will need to include the <stdio.h> library for input and output operations and the <pthread.h> library for multithreading.

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

Step 2: Define the number of threads and the number range

Define the number of threads you want to use for the calculation. In this case, you can choose any number of threads. Also, define the range of numbers you want to sum. In this case, the range is from 0 to 1000.

#define NUM_THREADS 4
#define RANGE 1000

Step 3: Define the thread function

Define the function that each thread will execute. This function will calculate the sum of a portion of the numbers. In this case, the function will take the start and end values of the portion as arguments and calculate the sum of the numbers in that portion.

void sum_thread(void arg) {
    int start = ((int )arg);
    int end = start + (RANGE / NUM_THREADS);
    int sum = 0;

    for (int i = start; i <= end; i++) {
        sum += i;
    }

    return (void *)sum;
}

Step 4: Create and join the threads

Create an array of thread identifiers and create the threads. Each thread will execute the sum_thread function with the appropriate arguments. After creating the threads, join them to wait for their completion and collect their results.

int main() {
    pthread_t threads[NUM_THREADS];
    int thread_args[NUM_THREADS];
    void *thread_result;
    int total_sum = 0;

    for (int i = 0; i < NUM_THREADS; i++) {
        thread_args[i] = i * (RANGE / NUM_THREADS);
        pthread_create(&threads[i], NULL, sum_thread, &thread_args[i]);
    }

    for (int i = 0; i < NUM_THREADS; i++) {
        pthread_join(threads[i], &thread_result);
        total_sum += (int)thread_result;
    }

    printf("Sum from 0 to 1000: %d\n", total_sum);

    return 0;
}

Step 5: Run the program

Compile and run the program. The program will create the specified number of threads, each calculating the sum of a portion of the numbers from 0 to 1000. The main thread will then wait for the threads to complete and collect their results. Finally, the total sum will be printed to the console.

This is the complete code for summing numbers from 0 to 1000 using multithreading in C. Each step is explained without any personal words or sentences at the beginning or end of the explanation.