How to Find Execution Time and Memory usage of a program in c

Question

I have made a application program in c language. And now i am trying to find Execution time and memory usage of my program. I have tried using time.h header and had done following dif_sec = (double) difftime (time2,time1); But every time i run the program, it give different execution time. For eg. : 1st time i got 19 millisecond, and if i again i run the same program it will give me different execution time, greater then 19 millisecond, around 28 millisecond. And some time it give around 150 millisecond. So i am trying to get perfect execution time. And also need a help to find memory usage of a program. I am running my program on CodeBlocks in windows.

Answer 1

For Windows programs you can use QueryPerformanceCounter and QueryPerformanceFrequency to measure times to a decent accuracy. There's an article here .