fseek

#include <stdlib.h>
#include <stdio.h>
 
void main(int argc,char **argv)
{
	int len;
	FILE *fp;
	int val;
	int size;
 
	fp = fopen(argv[1], "wb");
	val = 52;
	fwrite(&val, sizeof(int), 1, fp);
	val = 122;
	fwrite(&val, sizeof(int), 1, fp);
	val = 21;
	fwrite(&val, sizeof(int), 1, fp);
	fclose(fp);
 
	val = 0;
 
 
	val = sizeof(int);
	printf("%d   ", val);
	fp = fopen(argv[1], "rb");
	fread(&val, sizeof(int), 1, fp);
	printf("%d ", val);
	//fseek(fp,4,SEEK_SET);
	if(feof(fp))
		printf("game over");
	else
	{
		fread(&val, sizeof(int), 1, fp);
		printf("%d ", val);
	}
 
	//fseek(fp,8,SEEK_SET);
	if(feof(fp))
		printf("game over");
	else
	{
		fread(&val, sizeof(int), 1, fp);
		printf("%d ", val);
	}
 
	fread(&val, sizeof(int), 1, fp);
	printf("XX %d ", val);
 
	if(feof(fp))
		printf("game over");
 
 
	fseek(fp,0,SEEK_END);
 
	size = ftell(fp);
	if(feof(fp))
		printf("game over");
 
	printf("   %d   ", size);
	fread(&val, sizeof(int), 1, fp);
	printf("%d ", val);
	fread(&val, sizeof(int), 1, fp);
	printf("%d ", val);
	fseek(fp, -4, SEEK_CUR);
	fread(&val, sizeof(int), 1, fp);
	printf("%d ", val);
	fseek(fp, -8, SEEK_CUR);
	fread(&val, sizeof(int), 1, fp);
	printf("%d ", val);
 
 
	/*while(!feof(fp))
	{
 
	}*/
 
	fclose(fp);
}