09/07/02 16:14:04
>>443
/* 課題１ */
#include <stdio.h>
#include <math.h>
int main() {
struct Vertex { double x, y; } verA, verB, verC, verD;
printf("verA (x, y): "); scanf("%lf %lf", &verA.x, &verA.y);
printf("verB (x, y): "); scanf("%lf %lf", &verB.x, &verB.y);
printf("verC (x, y): "); scanf("%lf %lf", &verC.x, &verC.y);
printf("verD (x, y): "); scanf("%lf %lf", &verD.x, &verD.y);
if (verA.y != verB.y || verC.y != verD.y) {
printf("error\n");
} else {
printf("area: %g\n", (fabs(verA.x-verB.x)+fabs(verC.x-verD.x))*fabs(verA.y-verC.y)/2);
}
return 0;
}