>>182続き
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
??????? struct {
double x;
double y;
} ???????;
int InputVector(FILE *stream, Vector *v)
{
int result = fscanf(stream, "%lf", ???????);
if(result < 0) return result;
result = fscanf(stream, "%lf", ???????);
return result;}
double LengthVector(Vector v)
{return sqrt(???????);
}int main(int argc, char **argv)
{int i, num, checker;
Vector *varray;
FILE* inputstream;
FILE* outputstream = stdout;
//set input
if(argc < 2) {
fprintf(stderr, "input data from stdin\n");
inputstream = stdin;
}else
{inputstream = fopen(???????, ???????);
if(!inputstream)
{fprintf(stderr, "input file open error\n");
return 1;