How to judge the type of triangle type in C language applet

The first to judge the type of triangle, two floating-point data can not directly judge the equality, for the convenience of input, set their own low precision, 10^ ( -3) Copy code code as follows:


#include <stdio.h>


#include <stdlib.h>


#define Epsinon 1e-3


#define ABS (A) (((a) >0)? ( A):(-a))//? : expression nesting is not supported


#define ZERO (x) ((x) >-epsinon && (x) <epsinon)


#define MAX (A,b) ((a) > (b))? ( A):(B)


#define MIN (A,b) (((a) < (b))? ( A):(B)


float A, b, C;


float Max, Mid, Min;


char input_err_flag = 0;


char judge_err_flag = 0;


int equal (float A, float b)


{


float tmp;


tmp = A-b;


tmp = ZERO (ABS (TMP));


return tmp;


}


void input (void)


{


A = b = c = 0;


printf ("Enter a value of three edges:");


scanf ("%f%f%f", &a, &b, &c);


if (!) ( a>0) | | ! (b>0) | | ! (c>0))


 {


Input_err_flag = 1;


 }


}


void sort (void)


{


max = max (max (a,b), c);


min = min (min (a,b), c);


if (MAX (A,B) < C)


mid = MAX (a,b);


Else


mid = MAX (MIN (a,b), c);


}


void judge (void)


{


float max_square, Mid_square, Min_square, TMP;


if (max >= (mid+min))


 {


Judge_err_flag = 1;


 }


Else


 {


max_square = max * MAX;


Mid_square = mid * mid;


min_square = min * min;


tmp = Mid_square + min_square;


if (equal (mid,min) | | | equal (MAX, mid)


  {


if (Equal (Mid, Min))


   {


if (mid = = max)


puts ("equilateral"). ");


Else if (equal (Max_square, TMP))


puts ("isosceles right-angled triangle." ");


else if (Max_square < TMP)


puts ("Isosceles acute triangle". ");


Else


puts ("Isosceles obtuse". ");


   }


Else


   {


if (Equal (min, mid))


puts ("equilateral"). ");


Else


puts ("Isosceles acute triangle". ");


   }


  }


Else if (equal (Max_square, TMP))


puts ("right-angled triangle"). ");


else if (Max_square < TMP)


puts ("acute triangle"). ");


Else


puts ("obtuse"). ");


 }


}


int main (void)


{


Char cs, ch;


do


 {


input ();


sort ();


judge ();


if (input_err_flag)


  {


input_err_flag = 0;


while ((Cs=getchar ())!= ' n ' && (Cs=getchar ())!=eof);


printf ("Input error, a B c must be greater than 0, new input (y/n):");


  }


else if (judge_err_flag)


  {


judge_err_flag = 0;


while ((Cs=getchar ())!= ' n ' && (Cs=getchar ())!=eof);


printf ("Group is not triangular, re-enter (y/n):");


  }


Else


  {


while ((Cs=getchar ())!= ' n ' && (Cs=getchar ())!=eof);


printf ("Enter a second set of data (y/n):");


  }


ch = getchar ();


 }


while (ch== ' y ' | | | | ch== ' y ' | | | ch== ' n ');


puts ("goodbye!");


return 0;


}