题解 | 计算三角形的周长和面积

#include <math.h>
#include <stdio.h>

int main() {
    int a, b, c = 0;
    do {
        scanf("%d %d %d", &a, &b, &c);
    } while (a + b <= c || a + c <= b || b + c <= a);
    float circumference = 0;//周长
    float area = 0;
    float half_circumference = 0;//半周长——>用来计算面积
    half_circumference = (a + b + c) * 1.0 / 2;
    circumference = a + b + c;
    area = sqrt(half_circumference * (half_circumference - a) * (half_circumference - b) * (half_circumference - c));
    printf("circumference=%.2f area=%.2f", circumference, area);
    return 0;
}