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S.No 5706 Name MiD Date/Time 23-May-2023 12:47:37 AM

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#include <stdio.h>

#include <omp.h>

 

static long num_steps = 100000000;

double step;

 

int main() {

    double pi, sum = 0.0;

    double start_time, end_time;

 

    step = 1.0 / (double) num_steps;

 

    start_time = omp_get_wtime();

 

    #pragma omp parallel

    {

        double x;

        double local_sum = 0.0;

 

        #pragma omp for

        for (int i = 0; i < num_steps; i++) {

            x = (i + 0.5) * step;

            local_sum += 4.0 / (1.0 + x * x);

        }

 

        #pragma omp atomic

        sum += local_sum;

    }

 

    pi = step * sum;

 

    end_time = omp_get_wtime();

 

    printf("Computed pi = %.15f\n", pi);

    printf("Runtime = %.6f seconds\n", end_time - start_time);

 

    return 0;

}





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