//Header file: #include
//Declaration long int ftell(FILE *stream);
//Return: returns -1 on failure.
#include
#include
int main(void){
FILE *fp;
if((fp=fopen("test", "rb")) == NULL) {
printf("Cannot open file.\n");
exit(1);
}
int i;
if((i=ftell(fp)) == -1L)
printf("A file error has occurred.\n");
fclose(fp);
}