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- #include <iostream>
- #include <string>
- #include <ctime>
- #define N 1000
- double array_sum(double a[N][N])
- {
- int i,j;
- double s;
- s=0;
- for (i=0;i<N;++i)
- {
- for (j=0;j<N;++j)
- {
- s += a[i][j];
- }
- }
- return s;
- }
- double array_sum2(double a[N][N])
- {
- int i,j;
- double s;
- s=0;
- for (j=0;j<N;++j)
- {
- for (i=0;i<N;++i)
- {
- s += a[i][j];
- }
- }
- return s;
- }
- int main(int argc, char** argv)
- {
- using namespace std;
- double a[N][N];
- int i,j;
- for (j=0;j<N;++j)
- {
- for (i=0;i<N;++i)
- {
- a[i][j] = 0.01;
- }
- }
- {
- double sum = 0.0;
- clock_t begin = clock();
- for (i=0;i<2000;++i)
- {
- sum+=array_sum(a);
- }
- clock_t end = clock();
- std::cout << "sum = " << sum << std::endl;
- double elapsed_secs = double(end - begin) / CLOCKS_PER_SEC;
- std::cout << "elapsed_secs " << elapsed_secs << std::endl;
- }
- {
- double sum = 0.0;
- clock_t begin = clock();
- for (i=0;i<2000;++i)
- {
- sum+=array_sum2(a);
- }
- clock_t end = clock();
- std::cout << "sum = " << sum << std::endl;
- double elapsed_secs = double(end - begin) / CLOCKS_PER_SEC;
- std::cout << "elapsed_secs " << elapsed_secs << std::endl;
- }
- return 0;
- }
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