MinyazevR · MinyazevR · Oct 15, 2021 · Oct 15, 2021 · Oct 15, 2021 · Oct 15, 2021
diff --git a/Postfixform/Postfixform.sln b/Postfixform/Postfixform.sln
@@ -0,0 +1,31 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.31410.357
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Postfixform", "Postfixform\Postfixform.vcxproj", "{15009E36-9D86-441E-A9EA-947AAC734F19}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
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+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
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+		{15009E36-9D86-441E-A9EA-947AAC734F19}.Release|x86.Build.0 = Release|Win32
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diff --git a/Postfixform/Postfixform/Main.c b/Postfixform/Postfixform/Main.c
@@ -0,0 +1,34 @@
+#include "../../Stack/Stack/Stack.h"
+#include "Postfix.h"
+#include "PostfixFormTest.h"
+#include <stdio.h>
+
+int main()
+{
+    if (!areTestPassingPostfixForm())
+    {
+        printf("Test failed");
+        return -1;
+    }
+    char postfixEntry[250] = { '\0' };
+    printf("enter the expression in postfix form\n");
+    scanf_s("%[^\n]s", postfixEntry, (unsigned)sizeof(postfixEntry));
+    int errorCode = 0;
+    const float answer = countTheExpression(postfixEntry, &errorCode);
+    if (errorCode == 1)
+    {
+        printf("Incorrect input of an expression in postfix form");
+        return -1;
+    }
+    if (errorCode == 2)
+    {
+        printf("invalid character in the expression entry");
+        return -1;
+    }
+    if (errorCode == 3)
+    {
+        printf("it is impossible to divide by 0");
+        return -1;
+    }
+    printf("%f", answer);
+}
diff --git a/Postfixform/Postfixform/Postfix.c b/Postfixform/Postfixform/Postfix.c
@@ -0,0 +1,77 @@
+#include "../../Stack/Stack/Stack.h"
+#include "Postfix.h"
+#include <stdlib.h>
+
+float countTheExpression(const char* postfixEntry, int* errorCode)
+{
+    Stack* head = NULL;
+    int counter = 0; 
+    int error = 0;
+    while (postfixEntry[counter] != '\0')
+    {
+        if (postfixEntry[counter] >= '0' && postfixEntry[counter] <= '9')
+        {
+            push(&head, (float)postfixEntry[counter] - '0');
+            counter++;
+            continue;
+        }
+        else if (postfixEntry[counter] == ' ')
+        {
+            counter++;
+            continue;
+        }
+        float secondNumber = pop(&head, &error);
+        if (error == 1)
+        {
+            *errorCode = error;
+            return 0;
+        }
+        float firstNumber = pop(&head, &error);
+        if (error == 1)
+        {
+            *errorCode = error;
+            return 0;
+        }
+        if (postfixEntry[counter] == '-')
+        {
+            push(&head, (firstNumber - secondNumber));
+        }
+        else if (postfixEntry[counter] == '+')
+        {
+            push(&head, firstNumber + secondNumber);
+        }
+        else if (postfixEntry[counter] == '*')
+        {
+            push(&head, firstNumber * secondNumber);
+        }
+        else if (postfixEntry[counter] == '/') 
+        {
+            if (secondNumber == 0)
+            {
+                *errorCode = 3;
+                return 0;
+            }
+            push(&head, firstNumber / secondNumber);
+        }
+        else
+        {
+            deleteStack(&head);
+            *errorCode = 2;
+            return 0;
+        }     
+        counter++;
+    }
+    const float answer = pop(&head, &error);
+    if (error == 1)
+    {
+        *errorCode = error;
+        return 0;
+    }
+    if (!isEmpty(head))
+    {
+        deleteStack(&head);
+        *errorCode = 1;
+        return 0;
+    }
+    return answer;
+}
diff --git a/Postfixform/Postfixform/Postfix.h b/Postfixform/Postfixform/Postfix.h
@@ -0,0 +1,4 @@
+#pragma once
+
+// Function for calculating the value of an expression in postfix form
+float countTheExpression(const char* postfixEntry, int* errorCode);
diff --git a/Postfixform/Postfixform/PostfixFormTest.c b/Postfixform/Postfixform/PostfixFormTest.c
@@ -0,0 +1,31 @@
+#include "PostfixFormTest.h"
+#include "Postfix.h"
+
+bool areTestPassingPostfixForm()
+{
+    const char firstCorrectPostfixEntry[250] = "3 2 - 4 5 * + 2 9 - *";
+    const char secondCorrectPostfixEntry[250] = "2 3 - 4 5 * +";
+    const char thirdCorrectPostfixEntry[250] = "9 6 - 1 2 + *";
+    const char fourthCorrectPostfixEntry[250] = "9 6 - 5 2 / +";
+    const char fifthCorrectPostfixEntry[250] = "9 6 - 3 -";
+
+    const char firstIncorrectPostfixEntry[250] = "3 5 a";
+    const char secondIncorrectPostfixEntry[250] = "4 0 /";
+    const char thirdIncorrectPostfixEntry[250] = "34 - 345";
+    const char fourthIncorrectPostfixEntry[250] = "12 - 34 + 4";
+    const char fifthIncorrectPostfixEntry[250] = "1234 - 12";
+
+    int errorCode[10] = {0};
+
+    return countTheExpression(firstCorrectPostfixEntry, &errorCode[0]) == -147 && errorCode[0] == 0
+        && countTheExpression(secondCorrectPostfixEntry, &errorCode[1])  == 19 && errorCode[1] == 0
+        && countTheExpression(thirdCorrectPostfixEntry, &errorCode[2]) == 9 && errorCode[2] == 0
+        && countTheExpression(fourthCorrectPostfixEntry, &errorCode[3]) == 5.5 && errorCode[3] == 0
+        && countTheExpression(fifthCorrectPostfixEntry, &errorCode[4]) == 0 && errorCode[4] == 0
+
+        && countTheExpression(firstIncorrectPostfixEntry, &errorCode[5]) == 0 && errorCode[5] == 2
+        && countTheExpression(secondIncorrectPostfixEntry, &errorCode[6]) == 0 && errorCode[6] == 3
+        && countTheExpression(thirdIncorrectPostfixEntry, &errorCode[7]) == 0 && errorCode[7] == 1
+        && countTheExpression(fourthIncorrectPostfixEntry, &errorCode[8]) == 0 && errorCode[8] == 1
+        && countTheExpression(fifthIncorrectPostfixEntry, &errorCode[9]) == 0 && errorCode[9] == 1;
+}
diff --git a/Postfixform/Postfixform/PostfixFormTest.h b/Postfixform/Postfixform/PostfixFormTest.h
@@ -0,0 +1,5 @@
+#pragma once
+#include <stdbool.h>
+
+// Function for testing a function that translates an expression from a postfix form
+bool areTestPassingPostfixForm();
diff --git a/Postfixform/Postfixform/Postfixform.vcxproj b/Postfixform/Postfixform/Postfixform.vcxproj
@@ -0,0 +1,170 @@
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