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  1. #include "mpi.h"
  2. #include <stdio.h>
  3. #include <stdlib.h>
  4. #include <math.h>
  5.  
  6. #define MASTER 0
  7. #define POLY_DEGREE 3
  8. #define X_VALUE 2.0
  9.  
  10. int main(int argc, char* argv[]) {
  11.     int numtasks, taskid;
  12.     float global_result = 0.0, local_result = 0.0;
  13.     float coefficients[POLY_DEGREE + 1];
  14.  
  15.     MPI_Init(&argc, &argv);
  16.     MPI_Comm_size(MPI_COMM_WORLD, &numtasks);
  17.     MPI_Comm_rank(MPI_COMM_WORLD, &taskid);
  18.  
  19.     if (taskid == MASTER) {
  20.         for (int i = 0; i <= POLY_DEGREE; i++) {
  21.             coefficients[i] = i + 1.0;
  22.         }
  23.         printf("Polinomul: ");
  24.         for (int i = POLY_DEGREE; i >= 0; i--) {
  25.             printf("%.2fx^%d ", coefficients[i], i);
  26.             if (i != 0) {
  27.                 printf("+ ");
  28.             }
  29.             else {
  30.                 printf("\n");
  31.             }
  32.         }
  33.     }
  34.  
  35.     MPI_Bcast(coefficients, POLY_DEGREE + 1, MPI_FLOAT, MASTER, MPI_COMM_WORLD);
  36.  
  37.     int chunk_size = (POLY_DEGREE + 1) / numtasks;
  38.     int start = taskid * chunk_size;
  39.     int end = (taskid + 1) * chunk_size;
  40.     if (taskid == numtasks - 1) {
  41.         end = POLY_DEGREE + 1;
  42.     }
  43.  
  44.     printf("Task %d starts calculating: ", taskid);
  45.     for (int i = start; i < end; i++) {
  46.         float term_value = coefficients[i] * pow(X_VALUE, i);
  47.         local_result += term_value;
  48.         printf("%.2f*%.2f^%d = %.2f ", coefficients[i], X_VALUE, i, term_value);
  49.         if (i < end - 1) {
  50.             printf("; ");
  51.         }
  52.     }
  53.     printf(", Partial Sum: %.2f\n", local_result);
  54.  
  55.     MPI_Reduce(&local_result, &global_result, 1, MPI_FLOAT, MPI_SUM, MASTER, MPI_COMM_WORLD);
  56.  
  57.     if (taskid == MASTER) {
  58.         printf("Valoarea finala a polinomului evaluat in punctul %.2f este: %.2f\n", X_VALUE, global_result);
  59.     }
  60.  
  61.     MPI_Finalize();
  62.     return 0;
  63. }
  64.  
Success #stdin #stdout #stderr 0.28s 40608KB
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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/d1cs9X
language:
R (R 3.5.2)
created:
16 days ago
visibility:
public

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