(C syntax Question 34) Helen's Formula

Knowledge point:

Application of mathematical functions SQRT ()

Remember to add the header file math.264

Understand Helen's Formula

 

Content: known 3-side length, Triangle Area

 

Input description:

Three numbers per row

 

Output description:

One row (with 2 decimal places retained) or data error! (A triangle cannot be formed)

Input example:

1 2 3

 

Output example:

Data Error!

 

# Include <stdio. h> # include <math. h> int main () {float a, B, c, P, S; scanf ("% F", & A, & B, & C ); P = (A + B + C)/2; if (a + B> C & A + C> B & B + C>) {S = SQRT (p * (p-a) * (p-B) * (p-C); printf ("%. 2f \ n ", S);} else {printf (" data error! \ N ") ;}return 0 ;}

 

(C syntax Question 34) Helen's Formula