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f=fopen(..."wb");
fwrite(&student1,sizeof(struct STUDENT),1,f);
fwrite(&student2,sizeof(struct STUDENT),1,f);
fwrite(&teacher1,sizeof(struct TEACHER),1,f);
fwrite(&teacher2,sizeof(struct TEACHER),1,f);
fclose(f);
f=fopen(..."rb");
fread(&student1,sizeof(struct STUDENT),1,f);
fread(&student2,sizeof(struct STUDENT),1,f);
fread(&teacher1,sizeof(struct TEACHER),1,f);
fread(&teacher2,sizeof(struct TEACHER),1,f);
fclose(f);