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Timing homework

Question
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Last week our class was given the folllowing instructions to do a program:
o Input range of N values
o Create range_time_vector
o Input number_of_cases
o for each input in the range of inputs
· Set time_sum to zero
· Set time_average to zero
· For each case
§ Start the time
§ Execute the loop
§ End the time
§ Add the time difference to time_sum
o Calculate time_average = time_sum/ number_of_cases
o Store time_average in range_time_vector at input index
So far I've been able to do this much:
#include <iostream>
#include <vector>
using namespace std;
int main ()
{
int N =0;
int Range=0;
int NumberOfCases=0;
cout << "Enter N" <<endl;
cin >> N;
cout << "Enter Range" <<endl;
cin >> Range;
cout << "Number of cases" <<endl;
cin >> NumberOfCases;
vector<double> range_time_Vector(Range);
int K = N;
for(int i=0; i < Range; ++i)
{
double time_sum = 0.0;
double time_average = 0.0;
for (int m=1 ; m <= NumberOfCases; ++m)
{
cout << "for m=" << m << " K=" << K << endl;
}
}
return 0;
}
Can Someone help me with the following steps:
For each case§ Start the time
§ Execute the loop
§ End the time
§ Add the time difference to time_sum
o Calculate time_average = time_sum/ number_of_cases
o Store time_average in range_time_vector at input index
I tried googling and going to cplusplus.com, but wasn't able to find anything to help me with my program.- Changed type noyfb1 Wednesday, March 10, 2010 5:35 PM
Answers
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Well, to calculate time, you have a couple of options. std::clock() can be used to get "ticks" that have elapsed since your program began. The resolution may not be what you need. You get CLOCKS_PER_SEC "ticks" every second (this is 1000 in VS2008).
If you want to use Microsoft specific code, try QueryPerformamceCounter and QueryPerformanceFrequency for high-precision timing.- Marked as answer by Nancy Shao Tuesday, March 16, 2010 5:33 AM
All replies
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> Can Someone help me with the following steps:
These forums aren't really for homework assignments, however here's some
hints that may get you a bit futher ;)
> § Start the time
I'd replace the above with "get the current time" (and save it)
> § End the time
Get the time now.
Dave -
Well, to calculate time, you have a couple of options. std::clock() can be used to get "ticks" that have elapsed since your program began. The resolution may not be what you need. You get CLOCKS_PER_SEC "ticks" every second (this is 1000 in VS2008).
If you want to use Microsoft specific code, try QueryPerformamceCounter and QueryPerformanceFrequency for high-precision timing.- Marked as answer by Nancy Shao Tuesday, March 16, 2010 5:33 AM