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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <mpi.h>
  4.  
  5. #define ARRAY_SIZE 1000
  6.  
  7. int main(int argc, char **argv) {
  8.     int rank, size;
  9.     int local_sum = 0;
  10.     int global_sum = 0;
  11.     int i;
  12.     int *numbers = (int*)malloc(ARRAY_SIZE * sizeof(int));
  13.  
  14.     MPI_Init(&argc, &argv);
  15.     MPI_Comm_rank(MPI_COMM_WORLD, &rank);
  16.     MPI_Comm_size(MPI_COMM_WORLD, &size);
  17.  
  18.     // Generate random numbers
  19.     srand(rank);
  20.     for (i = 0; i < ARRAY_SIZE; i++) {
  21.         numbers[i] = rand() % 100;
  22.     }
  23.  
  24.     // Calculate local sum
  25.     for (i = 0; i < ARRAY_SIZE; i++) {
  26.         local_sum += numbers[i];
  27.     }
  28.  
  29.     // Reduce local sums to get global sum
  30.     MPI_Reduce(&local_sum, &global_sum, 1, MPI_INT, MPI_SUM, 0, MPI_COMM_WORLD);
  31.  
  32.     if (rank == 0) {
  33.         printf("Total sum: %d\n", global_sum);
  34.     }
  35.  
  36.     MPI_Finalize();
  37.  
  38.     free(numbers);
  39.     return 0;
  40. }
  41.  
Success #stdin #stdout #stderr 0.29s 40648KB
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Standard input is empty
stdout
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Standard output is empty
stderr
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Error: unexpected symbol in "int main"
Execution halted
https://ideone.com/T4DRs7
language:
R (R 3.5.2)
created:
16 days ago
visibility:
public

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