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  1. #include <iostream>
  2. #include <mpi.h>
  3. #include <cstdlib>
  4.  
  5. int main(int argc, char **argv) {
  6.     MPI_Init(&argc, &argv);
  7.  
  8.     int rank;
  9.     MPI_Comm_rank(MPI_COMM_WORLD, &rank);
  10.  
  11.     // Read the local value of the process
  12.     // local_value will hold a specific int for process 0, and another for process 1
  13.     int local_value;
  14.     local_value = atoi(argv[1]);
  15.  
  16.     int other_value;
  17.     if (rank == 0) {
  18.         // Code for the first process:
  19.         // 1- Send the value to process 1
  20.         // 2- Receive the value from process 1 (in other_value)
  21.         // 3- Print the sum of the two values on stdout
  22.         MPI_Send(&local_value, 1, MPI_INT, 1, 0, MPI_COMM_WORLD);
  23.         MPI_Recv(&other_value, 1, MPI_INT, 1, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
  24.         std::cout << "SUM IS: " << (local_value + other_value) << std::endl;
  25.     }
  26.     else {
  27.         // Code for the second process:
  28.         // 1- Receive the value from process 0 (in other_value)
  29.         // 2- Send the value to process 0
  30.         // 3- Print the product of the two values on stdout
  31.         MPI_Recv(&other_value, 1, MPI_INT, 0, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
  32.         MPI_Send(&local_value, 1, MPI_INT, 0, 0, MPI_COMM_WORLD);
  33.         std::cout << "PRODUCT IS: " << (local_value * other_value) << std::endl;
  34.     }
  35.  
  36.     MPI_Finalize();
  37.  
  38.     return 0;
  39. }
  40.  
Success #stdin #stdout #stderr 0.26s 40844KB
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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/MqK6ow
language:
R (R 3.5.2)
created:
12 days ago
visibility:
public

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