Compute C + + program execution time to the millisecond level __c++

Refer to others ' own summary. I have a limited level and have trouble pointing out mistakes.

Two methods: (Please ignore bubble sort)

First type:

#include <iostream> #include <vector> #include <time.h> #include <sys/timeb.h> #include <
Windows.h> using namespace std;
	void Bubble_sort1 (vector<int> &t) {int length = t.size ();
			for (int i = 0; i < length-1. i++) {for (int j = 0; J < length-1-I. j) {if (T[j] > t[j + 1])
				{int temp = t[j];
				T[J] = t[j + 1];
			T[j + 1] = temp;
and/or upgraded version, added flag to determine if a cycle has been exchanged without directly ending.
	void Bubble_sort2 (vector<int> &t) {int length = t.size ();
		for (int i = 0; i < length-1 i++) {BOOL flag = false;
				for (int j = 0; J < length-1-I; j + +) {if (T[j] > t[j + 1]) {int temp = t[j];
				T[J] = t[j + 1];
				T[j + 1] = temp;
			Flag = true;
		} if (!flag) {break;
	int main () {DWORD start1, end1;
	Start1 = GetTickCount ();
	Srand ((unsigned) time (0));
	Vector<int> v;
		for (int i = 0; i < 1700 i++) {V.push_back (rand ()); V.push_back (rand ()% 10);//Generate 0 to 9 random number} bubble_sort1 (v);
	End1 = GetTickCount ();
	cout << "Cost Time (ms):" << end1-start1 << Endl;
return 0; }

The second type:

#include <iostream> #include <vector> #include <time.h> #include <sys/timeb.h> #include <
Windows.h> using namespace std;
	void Bubble_sort1 (vector<int> &t) {int length = t.size ();
			for (int i = 0; i < length-1. i++) {for (int j = 0; J < length-1-I. j) {if (T[j] > t[j + 1])
				{int temp = t[j];
				T[J] = t[j + 1];
			T[j + 1] = temp;
and/or upgraded version, added flag to determine if a cycle has been exchanged without directly ending.
	void Bubble_sort2 (vector<int> &t) {int length = t.size ();
		for (int i = 0; i < length-1 i++) {BOOL flag = false;
				for (int j = 0; J < length-1-I; j + +) {if (T[j] > t[j + 1]) {int temp = t[j];
				T[J] = t[j + 1];
				T[j + 1] = temp;
			Flag = true;
		} if (!flag) {break;
	int main () {struct TIMEB start, end;
	Ftime (&start);
	Srand ((unsigned) time (0));
	Vector<int> v;
		for (int i = 0; i < 1700 i++) {V.push_back (rand ()); V.push_back (rand ()% 10)//Generate 0 to 9 random number} bubble_sort1 (v);
	Ftime (&end);
	cout << "Cost Time (ms):" << (end.time-start.time) * 1000 + (END.MILLITM-START.MILLITM) << Endl;
return 0; }