C language - Calculate the running time of a certain code

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1. #include<stdio.h>  
2. #include<process.h>  
3. #include<time.h>//time.h header file  
4.   
5. intmain  ()  
6. {  
7.   
8.     int   begin, end; //define start and end flags  
9.   
10.         begin=clock(); //Start timing  
11.    
12.     end=clock(); //end timing  
13.     printf( "%d\n" , end-begin); //The difference is time, in milliseconds  
14.   
15.         system("pause");  
16.     return 0;  
17. }  

Use the clock() function included in time.h to calculate the running time of a piece of code.

The time.h header file has a lot more to explore.