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【额外练习】选择结构

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Baoshuo Ren 2024-11-08 22:57:10 +08:00
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【额外练习】选择结构/7-48 选择-三角形面积2.c Normal file
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#include <math.h>
#include <stdio.h>
int main() {
int x1, y1, x2, y2, x3, y3;
double a, b, c, s, area;
scanf("%d%d%d%d%d%d", &x1, &y1, &x2, &y2, &x3, &y3);
a = sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
b = sqrt((x1 - x3) * (x1 - x3) + (y1 - y3) * (y1 - y3));
c = sqrt((x2 - x3) * (x2 - x3) + (y2 - y3) * (y2 - y3));
if (a + b > c && a + c > b && b + c > a) {
s = (a + b + c) / 2;
area = sqrt(s * (s - a) * (s - b) * (s - c));
printf("%.1f %.1f\n", a + b + c, area);
} else {
printf("no triangle!\n");
}
return 0;
}