![]() ![]() Sometimes a code with simple calculation might provide the optimal time of execution in order to fulfill a certain use case. While looking at both the examples, we see that using clock() in both the examples taught us that, even if we use functions in the processing of the loop, it might or might not be the most optimized method for processing. Processing time of a remainder function which is an inbuilt function in C++.Ĭout << "Using mod operator, processing of a loop of 100000000 integers took " << (float)clockVariable/CLOCKS_PER_SEC << " seconds" << endl Ĭout << "Without using mod operator, processing of same 100000000 integers for loop took " << (float)clockVariable/CLOCKS_PER_SEC << " seconds" << endl įinding the hypotenuse of 100000 random triangles (the triangles are identical in both the processing).Ĭout << "Using hypot operator, processing of a loop of 100 integers took " << (float)clockVariable/CLOCKS_PER_SEC << " seconds" << endl Ĭout << "Without using hypot operator, processing of same 100 integers for loop took " << (float)clockVariable/CLOCKS_PER_SEC << " seconds" << endl Here are the following examples mention below. The formula for calculating the processing time in seconds is: (T end – T start) / CLOCKS_PER_SEC Examples Now, in order to convert the difference in time to seconds, we would have to divide it by a system-specific length that is described as a variable in CLOCKS_PER_SEC. one at the start of the program and the other at the end of the block of the program of which we want to determine the processing time, we subtract the 2 values in order to get the difference of the processing time. Now that we get the time at 2 intervals i.e. In case there is a failure, we would get a value of -1. Now after the header file is referred to, clock() function gets the command of getting all the prerequisites and then gets back the approximate processing time that is taken by the program till the point the function is called. Not only this, the header files also contain various macros, and one of these macros we would use to convert the clock ticks into minutes. The functionality in this header file is about manipulating data and time information on the program where any of these functions are called. ctime header file contains the definitions of various functions and all these functions have common functionality. When the clock() function is called it refers to the ctime header file. And as a result of the same, the output we get from the clock() function might be less or more than the actual time clock. In the opposite scenario, if there is a presence of other processes the clock() function may be lagging from the actual clock speed. ![]() ![]() In cases where the process is run in multiple threads the return value from clock() may be ahead of the actual clock. This is also dependent on the fact of how the resources are allocated by the operating system. In the introduction, we got to know that the function returns the processor time that is taken by a program for it to execute completely. Dividing by this macro will yield a number of seconds in order to denote the processing time of a program. This is a macro in C++ that is extended in order to represent the number of clock tick that happens in a second. Macro or constant involved in clock function in C++. ![]() The argument which the function takes in is void type, which essentially means that there is no argument that is passed to the function while calling or declaring it, and the variable is cast to type clock_t. The unit of the data type is the time of a constant.Ĭalling the clock function in C++: variable_name = clock() Here clock_t is the alias of a fundamental arithmetic data type that records the clock tick counts. The timer works fine when i hardcode the duration.Declaration of clock variable in C++: clock_t variable_name The number input is typ float and therefore i get 22.0 (e g.) instead of 22. I’am trying to create a timer by adding a number input with a slider to ajust the minutes and a button to start the countdown. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |