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can somebody help me check what is the problem here...the player is not moving and jumping.

// Dark GDK - The Game Creators - www.thegamecreators.com

// the wizard has created a very simple project that uses Dark GDK
// it contains the basic code for a GDK application

// whenever using Dark GDK you must ensure you include the header file
#include "DarkGDK.h"
#include <time.h>

int player;
void Load_media()
{
dbLoadImage("platformblue.jpg",1);
dbLoadImage("player.bmp",2);
dbLoadImage("Penguins.jpg",3);

}

void generate_level(int num_blocks, int Xblock_size, int Yblock_size)
{
int player=100;
int gap=1000;
int Yblock=0;
dbSprite(player,10,10,2);

for (int i=0; i<num_blocks; i++)
{
Yblock=dbSpriteY(i)+dbRnd(gap);
dbSprite(i,dbRnd(500),Yblock,1);
dbSizeSprite(i, Xblock_size, Yblock_size);
}
}

int x=100;
void movement()
{
if (dbRightKey()==1){x+=1;}
if (dbLeftKey()==1){x-=1;}
dbSprite(player,x,dbSpriteY(player),2);
}

void move_blocks()
{
for (int i=0; i<40; i++)
{
dbMoveSprite(i,-1);
}
}

void reset_blocks()
{
for (int i=0;i < 40;i++)
{
if (dbSpriteY(i) > 1000)
{
dbSprite(i,dbRnd(500),-40,1);
}

}
}

int jump_timer=0;
float speed = -0.5;
bool falling = false;

void jumping()
{
if (dbSpriteCollision(player,0)==0)
{
jump_timer++;
dbMoveSprite(player,speed);
falling = true;
}
else
{
falling = false;
jump_timer=0;
speed = -0.5;
}
}

float playerY;
float jump_speed = -2;
bool player_jumping = false;

void gravity()
{
playerY=dbSpriteY(player)+jump_speed;
if (player_jumping == true)
{
jump_speed=jump_speed + 0.07;
}
dbSprite(player,dbSpriteX(player),playerY,2);
if (jump_speed > 0.5f)
{
//play sound
jump_speed = -3;
player_jumping = false;
}
if (jump_timer > 20){speed=speed-0.1;}
}
void DarkGDK(void)
{
// turn on sync rate and set maximum rate to 60 fps
dbSyncOn ( );
dbSyncRate ( 60 );
dbSetDisplayMode(500,650,32);
srand(time(NULL));
Load_media();
generate_level(40,40,11);
// our main loop
while ( LoopGDK ( ) )
{
movement();
move_blocks();
reset_blocks();
jumping();
gravity();
dbPasteImage(3,0,0);
// update the screen
dbSync ( );
}

// return back to windows
return;
}

I would figure we would need to see more, can you make the above a standalone exicuteable and include the media, might be able to help a bit more. if we can see it, try and compile it.

Try using jump_timer = dbTimer() and then doing a subtraction in your conditions code e.g see below code taken from a mario clone platform game:



The variable "jumping" is just a boolean variable to test if the character is jumping or not e.g. if the jump key has been pressed and if the character is touching the ground.

In your example code, I couldn't see where you are testing to see if the user has pressed the key for jumping etc....