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  1. #include<omp.h>
  2. #include<stdio.h>
  3. #include<stdlib.h>
  4. #include<time.h>
  5.  
  6. time_t t1;
  7. unsigned long int RandomIntGen(){
  8.   return ( rand()%( 1000000000 - 1 +1)) +1 ;
  9. }
  10.  
  11.  
  12. clock_t begin, end;
  13.  
  14.  
  15. int main()
  16. {
  17.     //double pi,x;
  18.     srand((unsigned) time (&t1));
  19.  
  20.  
  21.     unsigned long long int i,Array_size = 10000000;
  22.     int n=15;
  23.  
  24.     //printf("Enter size?: \n");
  25.     //printf("\n array size! : ");
  26.     //scanf("%llu",&Array_size);
  27.     printf(" thread count : "); 
  28.     //scanf("%d",&n); 
  29.     //fflush(stdout);
  30.  
  31.     unsigned long int x[Array_size], MAX = 0, MIN= 100000001;
  32.  
  33.     for( i=0; i< Array_size; i++)
  34.         x[i] = RandomIntGen();
  35.     //printf("thread count?: ");
  36.     //fflush(stdout);
  37.     begin = clock();    
  38.     #pragma omp parallel num_threads(n)
  39.     {
  40.  
  41.         #pragma omp parallel for /*shared(MAX, x)*/ reduction(max:MAX)
  42.         for(i=0;i<Array_size;i++){
  43.             MAX = MAX > x[i] ? MAX : x[i];
  44.         }
  45.  
  46.         // min is working fine
  47.         #pragma omp parallel for /*shared(MIN, x)*/ reduction(min:MIN)
  48.         for(i=0;i<Array_size;i++){
  49.             MIN = MIN < x[i] ? MIN : x[i];
  50.         }
  51.  
  52.     }
  53.  
  54.     end = clock();
  55.  
  56.     //printf("\n array size! : %llu\n",Array_size);
  57.     //printf(" thread count : %d\n",n);    
  58.     printf(" MAX: %lu\n MIN: %lu\n",MAX,MIN);
  59.     double t = (end-begin)/ CLOCKS_PER_SEC ;
  60.     printf(" time: %lf s\n",t);
  61.     //printf(" time: sci:%e s\n",t);
  62.  
  63.     return 0;
  64. }
  65.  
  66.  
Success #stdin #stdout 0.17s 79752KB
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Standard input is empty
stdout
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 thread count :  MAX: 999999853
 MIN: 177
 time: 0.000000 s
https://ideone.com/Vsd4Ny
language:
C (gcc 8.3)
created:
2 years ago
visibility:
public

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