How to make timer for a game loop?

Question

I want to time fps count, and set it\'s limit to 60 and however i\'ve been looking throught some code via google, I completly don\'t get it.

Answer 1

delta time is the final time, minus the original time.

dt= t-t0

This delta time, though, is simply the amount of time that passes while the velocity is changing.

The derivative of a function represents an infinitesimal change in the function with respect to one of its variables. The derivative of a function with respect to the variable is defined as

                f(x + h) - f(x)
f'(x) = lim    -----------------
        h->0           h

http://mathworld.wolfram.com/Derivative.html

#include
#include
#include
#include
#pragma comment(lib,"winmm.lib")

void gotoxy(int x, int y);
void StepSimulation(float dt);

int main(){

  int NewTime = 0;
  int OldTime = 0;
  float dt = 0;
  float TotalTime = 0;
  int FrameCounter = 0;
  int RENDER_FRAME_COUNT = 60;

  while(true){

        NewTime = timeGetTime();    
        dt = (float) (NewTime - OldTime)/1000; //delta time
        OldTime = NewTime;

        if (dt > (0.016f)) dt = (0.016f);  //delta time
        if (dt < 0.001f) dt = 0.001f;

        TotalTime += dt;

        if(TotalTime > 1.1f){ 
            TotalTime=0;
            StepSimulation(dt);
            }

        if(FrameCounter >= RENDER_FRAME_COUNT){           
            // draw stuff
            //Render(); 

            gotoxy(1,2);
            printf(" \n");
            printf("OldTime      = %d \n",OldTime);
            printf("NewTime      = %d \n",NewTime);
            printf("dt           = %f  \n",dt);
            printf("TotalTime    = %f  \n",TotalTime);
            printf("FrameCounter = %d fps\n",FrameCounter);
            printf("   \n");
            FrameCounter = 0;

        } 
        else{
            gotoxy(22,7);
            printf("%d  ",FrameCounter);
            FrameCounter++;

        }


    }

    return 0;
}

void gotoxy(int x, int y){
    COORD coord;
    coord.X = x; coord.Y = y;
    SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), coord);
    return;
}

void StepSimulation(float dt){
    // calculate stuff
   //vVelocity += Ae * dt;

}