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SDL_GetTicks erratic motion thingy

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Hey there, here's a snippet from a program I'm doing, and for some reason the object moves erratically. Why?
int xvel,yvel;
if(merect.x!=goalx){if(merect.x<goalx){xvel=1;}else xvel=-1;}else xvel=0;
if(merect.y!=goaly){if(merect.y<goaly){yvel=1;}else yvel=-1;}else yvel=0;
printf("%f %i\n",lastupdate/1000-SDL_GetTicks()/1000,merect.x);			

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I'm a moron. I just stored the current ticks in a variable instead of calling it succesively. Now it works.

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