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main.cpp
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main.cpp
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#include <iostream>
#include <math.h>
#include <ctime>
using namespace std;
void int_func1(){
int n = 10000;
int counter = 0;
////////////////////////////// timer begin //////////////////////////////
double start_time = clock();
for (int a = 1; a < n; a++) {
for (int b = a+1; b < n; b++) {
if ( !( (a % 2 == 1) && (b % 2 == 1) ) ) {
double z = sqrt((a*a)+(b*b));
//if ( ( z <= n ) && (modf(z, &intptr) == 0) )
if ( ( z <= n ) && ( z - (int)z == 0) ) {
counter++;
}
}
}
}
////////////////////////////// timer end //////////////////////////////
double end_time = clock();
double search_time = end_time - start_time;
cout<<(search_time/CLOCKS_PER_SEC)<<endl;
counter*=2;
cout << counter << endl;;
}
void int_func2(){
int n = 10000;
int counter = 0;
////////////////////////////// timer begin //////////////////////////////
double start_time = clock();
for (int a = 1; a < n; a++) {
for (int b = n; b > a; b--) {
if ( !( (a % 2 == 1) && (b % 2 == 1) ) ) {
double z = sqrt((a*a)+(b*b));
//if ( ( z <= n ) && (modf(z, &intptr) == 0) )
if ( ( z <= n ) && ( z - (int)z == 0) ) {
counter++;
}
}
}
}
////////////////////////////// timer end //////////////////////////////
double end_time = clock();
double search_time = end_time - start_time;
cout<<(search_time/CLOCKS_PER_SEC)<<endl;
counter*=2;
cout << counter << endl;;
}
void double_func(){
int n = 10000;
int counter = 0;
////////////////////////////// timer begin //////////////////////////////
double start_time = clock();
for (int a = 1; a < n; a++) {
for (int b = a+1; b < n; b++) {
if ( !( (a % 2 == 1) && (b % 2 == 1) ) ) {
double z = sqrt((a*a)+(b*b));
//if ( ( z <= n ) && (modf(z, &intptr) == 0) )
if ( ( z <= n ) && ( z - (int)z == 0.0) ) {
counter++;
}
}
}
}
////////////////////////////// timer end //////////////////////////////
double end_time = clock();
double search_time = end_time - start_time;
cout<<(search_time/CLOCKS_PER_SEC)<<endl;
counter*=2;
cout << counter << endl;;
}
int main()
{
cout << "int func1: " << endl;
int_func1();
cout << "int func2: " << endl;
int_func2();
cout << "double func: " << endl;
double_func();
return 0;
}
//if ( !( (a % 2 == 1) && (b % 2 == 1) ) ) {
// double z = sqrt((a*a)+(b*b));
// if ( ( z <= n ) && (modf(z, &intptr) == 0) ) {
// counter++;
// }
//}
//for (int a = 3; a < n; a++) {
// for (int b = 3; b < n; b++) {
// if ( !( (a % 2 == 1) && (b % 2 == 1) ) && () ) {
// double z = sqrt((a*a)+(b*b));
// if ( ( z <= n ) && (modf(z, &intptr) == 0) ) {
// counter++;
// }
// }
// }
//}