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 @@
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diff --git a/Postfixform/Postfixform/Main.c b/Postfixform/Postfixform/Main.c
@@ -0,0 +1,27 @@
+#include "../../Stack/Stack/Stack.h"
+#include "../../Stack/Stack/StackTest.h"
+#include  "Postfix.h"
-#include  "Postfix.h"
+#include "Postfix.h"
-#include  "Postfix.h"
+#include "Postfix.h"
+#include "postfixFormTest.h"
+#include <stdio.h>
+#include <stdbool.h>
+#include <stdlib.h>
+
+int main()
+{
+    if (!pushTest() || !popTest() || !deleteStackTest() || !postfixFormTest())
+    {
+        printf("Test failed");
+        return -1;
+    }
+    char postfixEntry[250] = { '\0' };
+    printf("enter the expression in postfix form\n");
+    scanf_s("%[^\n]s", postfixEntry, (unsigned)_countof(postfixEntry));
+    bool check = true;
+    const int answer = countTheExpression(postfixEntry, &check);
+    if (!check)
+    {
+        printf("Incorrect input");
+        return 0;
+    }
+    printf("%d", answer);
+}
diff --git a/Postfixform/Postfixform/Postfix.c b/Postfixform/Postfixform/Postfix.c
@@ -0,0 +1,70 @@
+#include "../../Stack/Stack/Stack.h"
+#include "../../Stack/Stack/StackTest.h"
+#include "Postfix.h"
+#include <stdlib.h>
+#include <stdbool.h>
+
+int countTheExpression(char* postfixEntry, bool* check)
+{
+    bool copy = *check;
+    Stack* head = NULL;
+    int counter = 0; 
+    while (postfixEntry[counter] != '\0')
+    {
+        if (postfixEntry[counter] >= '0' && postfixEntry[counter] <= '9')
+        {
+            push(&head, (postfixEntry[counter] - '0'));
-            push(&head, (postfixEntry[counter] - '0'));
+            push(&head, postfixEntry[counter] - '0');
-            push(&head, (postfixEntry[counter] - '0'));
+            push(&head, postfixEntry[counter] - '0');
+            counter++;
+            continue;
+        }
+        else if (postfixEntry[counter] == ' ')
+        {
+            counter++;
+            continue;
+        }
+        int secondNumber = 0;
+        int firstNumber = 0;
+        secondNumber = pop(&head, &copy);
+        if (!copy)
+        {
+            *check = false;
+            return 0;
+        }
+        firstNumber = pop(&head, &copy);
+        if (!copy)
+        {
+            *check = false;
+            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] == '/') 
+        {
+            push(&head, firstNumber / secondNumber);
+        }
+        else
+        {
+            *check = false;
+            return 0;
+        }     
+        counter++;
+    }
+    const int answer = pop(&head, &copy);
+    if (!isEmpty(head))
+    {
+        *check = false;
+        return 0;
+    }
+    deleteStack(&head);
+    return answer;
+}
diff --git a/Postfixform/Postfixform/Postfix.h b/Postfixform/Postfixform/Postfix.h
@@ -0,0 +1,5 @@
+#pragma once
+#include <stdbool.h>
+
+// Function that translates an expression from a postfix form
+int countTheExpression(char* postfixEntry, bool *check);
diff --git a/Postfixform/Postfixform/PostfixFormTest.c b/Postfixform/Postfixform/PostfixFormTest.c
@@ -0,0 +1,19 @@
+#include "PostfixFormTest.h"
+#include "Postfix.h"
+#include <stdlib.h>
+
+bool postfixFormTest()
+{
+    char firstPostfixEntry[250] = "32-45*+29-*";
+    char secondPostfixEntry[250] = "26---";
+    char thirdPostfixEntry[250] = "9 6 - 1 2 + *";
+    char fourthPostfixEntry[250] = "34=+12";
+    bool firstCheck = true;
+    bool secondCheck = true;
+    bool thirdCheck = true;
+    bool fourthcheck = true;
+    return countTheExpression(firstPostfixEntry, &firstCheck) == -147 && firstCheck
+        && countTheExpression(secondPostfixEntry, &secondCheck)  == 0 && !secondCheck
+        && countTheExpression(thirdPostfixEntry, &thirdCheck) == 9 && thirdCheck
+        && countTheExpression(fourthPostfixEntry, &fourthcheck) == 0 && !fourthcheck;
+}
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 postfixFormTest();
diff --git a/Postfixform/Postfixform/Postfixform.vcxproj b/Postfixform/Postfixform/Postfixform.vcxproj
@@ -0,0 +1,172 @@
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diff --git a/Postfixform/Postfixform/Postfixform.vcxproj.filters b/Postfixform/Postfixform/Postfixform.vcxproj.filters
@@ -0,0 +1,48 @@
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