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  1. #include<stdio.h>
  2. #include<math.h>   //sqrt平方根函数需要这个头文件
  3. int main()
  4. {
  5.     float a, b, c, p, S;
  6.     printf("please input a b c:");
  7.     scanf("%f%f%f", &a, &b, &c);
  8.     p = (a + b + c) / 2;
  9.     S = sqrt(p*(p-a)*(p-b)*(p-c));
  10.     printf("S = %.2f\n", S);
  11.     return 0;
  12. }
Success #stdin #stdout 0s 5316KB
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stdin
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7 8 9
stdout
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please input a b c:S = 26.83
https://ideone.com/RG1lhM
language:
C++ 4.3.2 (gcc-4.3.2)
created:
1 day ago
visibility:
public

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