3.1.2 Matrix add/sub file concept, C (gcc)

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#include <stdio.h>
#include <stdlib.h>
#include <omp.h>

int main()
{
    int n;
    printf("\nDhananjay, 19BCE0599 \nenter value of n: \t");
    scanf("%d", &n);
    int arr1[n][n];
    int ans[n][n];
    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < n; j++)
        {
            arr1[i][j] = rand() % 10;
        }
    }
    double start = omp_get_wtime();
    for (int i = 0; i < n; i++)
        for (int j = 0; j < n; j++)
            ans[i][j] = arr1[i][j] + arr1[i][j];
    double end = omp_get_wtime();
    printf("serial addition of matrix: %lf \n", end - start);

start = omp_get_wtime();
#pragma omp parallel for schedule(static, 16)
    for (int i = 0; i < n; i++)
        for (int j = 0; j < n; j++)
            ans[i][j] = arr1[i][j] + arr1[i][j];
    end = omp_get_wtime();
    printf("time addition of matrix using static modifier and chunk_size 16: %lf \n", end - start);

start = omp_get_wtime();
#pragma omp parallel for schedule(dynamic, 16)
    for (int i = 0; i < n; i++)
        for (int j = 0; j < n; j++)
            ans[i][j] = arr1[i][j] + arr1[i][j];
    end = omp_get_wtime();
    printf("time addition of matrix using dynamic modifier and chunk_size 16: %lf\n", end - start);

start = omp_get_wtime();
#pragma omp parallel for schedule(guided, 16)
    for (int i = 0; i < n; i++)
        for (int j = 0; j < n; j++)
            ans[i][j] = arr1[i][j] + arr1[i][j];
    end = omp_get_wtime();
    printf("time addition of matrix using guided modifier and chunk_size 16: %lf\n", end - start);

start = omp_get_wtime();
#pragma omp parallel for schedule(static, 16)
    for (int i = 0; i < n; i++)
        for (int j = 0; j < n; j++)
            ans[i][j] = arr1[i][j] - arr1[i][j];
    end = omp_get_wtime();
    printf("time substraction of matrix using static modifier and chunk_size 16: %lf\n", end - start);

start = omp_get_wtime();
#pragma omp parallel for schedule(dynamic, 16)
    for (int i = 0; i < n; i++)
        for (int j = 0; j < n; j++)
            ans[i][j] = arr1[i][j] - arr1[i][j];
    end = omp_get_wtime();
    printf("time substraction of matrix using dynamic modifier and chunk_size 16: %lf\n", end - start);

start = omp_get_wtime();
#pragma omp parallel for schedule(guided, 16)
    for (int i = 0; i < n; i++)
        for (int j = 0; j < n; j++)
            ans[i][j] = arr1[i][j] - arr1[i][j];
    end = omp_get_wtime();
    printf("time substraction of matrix using guided modifier and chunk_size 16: %lf\n", end - start);

return 0;
}

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Compilation time: 0.22 sec, absolute running time: 0.18 sec, cpu time: 0.12 sec, memory peak: 10 Mb, absolute service time: 0,48 sec