From e93f2bcae5cfeb4b007d5286700f993eea0c20fc Mon Sep 17 00:00:00 2001
From: Bohdan Yanchyk <bohdan.yanchyk@student.tuke.sk>
Date: Thu, 2 Apr 2020 23:23:43 +0000
Subject: [PATCH] =?UTF-8?q?Aktualizovat=20=E2=80=9Edu4/program.c=E2=80=9C?=
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---
 du4/program.c | 41 ++++++++++++++++++++++++++++++++---------
 1 file changed, 32 insertions(+), 9 deletions(-)

diff --git a/du4/program.c b/du4/program.c
index d372d97..bea6389 100644
--- a/du4/program.c
+++ b/du4/program.c
@@ -1,5 +1,14 @@
+/******************************************************************************
+
+                            Online C Compiler.
+                Code, Compile, Run and Debug C program online.
+Write your code in this editor and press "Run" button to compile and execute it.
+
+*******************************************************************************/
+
 #include <stdio.h>
 #include<string.h>
+#include<math.h>
 #include<stdlib.h>
 char* compactString(char *src,int leng) {
     char *new_str = (char*)calloc(leng+1,sizeof(char));
@@ -16,16 +25,34 @@ char* compactString(char *src,int leng) {
 
 
 double operation(double first,double second,char c){
+    double x =0;
     if(c=='*'){
-        return first*second;
+         x=first*second;
+        return x;
     }
     else if(c =='-'){
-        return first-second;
+         x=first-second;
+        return x;
     }
     else if(c=='/'){
-        return first/second;
+         x=first/second;
+        return x;
     }
-    return first+second;
+    x= first+second;
+    return x;
+}
+
+
+double round_to(double value, double eps)
+{
+
+  return floor(value/eps + 0.5) * eps;
+}
+
+double compare_percent(double a, double b, double eps)
+{
+  double diff = round_to( (a - b) * 2 / (a + b), eps);
+  return diff < 0 ? -1 : diff > 0 ? +1 : 0;
 }
 
 
@@ -36,13 +63,9 @@ int main()
     memset(str,0,100);
     fgets(str,100,stdin);
     char *new_str = compactString(str,strlen(str));
-    //printf("%s\n",new_str);
     double first =-5,second =-5,res=-5;
     char c='E';
     sscanf(new_str,"%lf%c%lf%*[=]%lf",&first,&c,&second,&res);
-   // printf("%lf %lf %lf",first,second,res);
-    
-    
     
     
     if(c=='E'||first==-5||second==-5||res==-5){
@@ -50,7 +73,7 @@ int main()
         return 0;
     }
     double my_res = operation(first,second,c);
-    if(my_res==res){
+    if(compare_percent(res,my_res,0.01)==0){
         printf("OK\n");
     }
     else{