How to use the macro definition of c language to calculate the triangle area

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Macro definition exercise to find the triangle area

1. Topic description

The area of the triangle = SQRT (S * (Smura) * (Smurb) * (SMEC)) where S = (a+b+c) / 2Magi a, b, c are the three sides of the triangle. Define two macros with parameters, one for area and the other for S. Write a program in which the macro name with arguments is used to calculate the area area.

two。 Format and sample

Input format

The three sides of an a b c triangle, which can be decimals.

Output format

Triangle area, keeping 3 decimal places.

Sample input

3 4 5

Sample output

6.000

3. Reference answer 1#include

2#include

3#define s (a _ r _ b _ m _ c) (a+b+c) / 2

4#define area (a _ r _ r _ b _ r _ r _ r s) sqrt (s * (m _ Meia) * (m _ Meib) * (m _ Mel c))

5int main ()

6 {

7float x,y,z

8scanf ("% f%f%f", & X.

9printf ("% .3f", area (x _ mae _ r _ r _ z _ r _ s (x _ menery _ z)

10return 0

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