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  1. #include <mpi.h>
  2. #include <stdio.h>
  3. #include <stdlib.h>
  4. #include <time.h>
  5.  
  6. int main(int argc, char** argv) {
  7.     MPI_Init(&argc, &argv); // Initialize the MPI environment
  8.  
  9.     int rank, size;
  10.     MPI_Comm_rank(MPI_COMM_WORLD, &rank); // Get the rank of the process
  11.     MPI_Comm_size(MPI_COMM_WORLD, &size); // Get the total number of processes
  12.  
  13.     if (size != 5) {
  14.         if (rank == 0) {
  15.             printf("This program requires exactly 5 processes.\n");
  16.         }
  17.         MPI_Finalize();
  18.         return 1;
  19.     }
  20.  
  21.     // Generate a unique seed for each process
  22.     unsigned int seed = time(NULL) + rank; // Unique seed using current time and rank
  23.     srand(seed);
  24.  
  25.     // Generate a pseudo-random number
  26.     int random_number = rand();
  27.     printf("Process %d generated random number: %d\n", rank, random_number);
  28.  
  29.     // Find the maximum using MPI_Reduce
  30.     int max_random_number;
  31.     MPI_Reduce(&random_number, &max_random_number, 1, MPI_INT, MPI_MAX, 0, MPI_COMM_WORLD);
  32.  
  33.     // Root process prints the maximum random number
  34.     if (rank == 0) {
  35.         printf("The maximum random number is: %d\n", max_random_number);
  36.     }
  37.  
  38.     MPI_Finalize(); // Finalize the MPI environment
  39.     return 0;
  40. }
  41.  
Success #stdin #stdout #stderr 0.32s 40800KB
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Standard input is empty
stdout
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Standard output is empty
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Error: unexpected symbol in "int main"
Execution halted
https://ideone.com/lr0GjR
language:
R (R 3.5.2)
created:
3 days ago
visibility:
public

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