fread 문제 인듯한데요.. 도와주세요

#include <stdio.h> 
#include <stdlib.h>
#include <string.h> 
 
int main(void) {
    FILE *fp;
 
    fp = fopen("changdoc.txt","w+");
    unsigned int temp,read;
 
    for(temp=0;temp<500;temp++)
        fwrite(&temp,4,1,fp);
 
    for(temp=0;temp<500;temp++){
        fseek(fp,4*temp,0);
        fread(&read,4,1,fp);
        printf("%d\n",read);
        if(temp%20==0)system("PAUSE");
        }
    fclose(fp);
 
    return 0; 
}