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17 lines
389 B
17 lines
389 B
#include <bits/stdc++.h>
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using namespace std;
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int main() {
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double a, b, c, p;
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cin >> a >> b >> c;
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//scanf("%d %d %d", &a, &b, &c);
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if (a + b <= c || a + c <= b || b + c <= a) {
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printf("输入的边长不合法！");
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return 0;
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}
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p = 1.0 / 2 * (a + b + c);
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printf("%.1lf", sqrt(p * (p - a) * (p - b) * (p - c)));
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return 0;
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} |