diff --git a/du3/program.c b/du3/program.c
index d70ecf9..70aadbf 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -16,19 +16,19 @@ float IsArithCorrect(float num1, float num2, char op, float result)
     switch (op)
     {
         case '-':
-        num1 - num2 = calcResult;
+        calcResult = num1 - num2;
         break;
 
         case '+':
-        num1 + num2 = calcResult;
+        calcResult = num1 + num2;
         break;
 
         case '*':
-        num1 * num2 = calcResult;
+        calcResult = num1 * num2;
         break;
 
         case '/':
-        num1 / num2 = calcResult;
+        num1 / num2 / calcResult;
         break;
     }