Sorting station

Stack/Stack.sln

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+
+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}") = "Stack", "Stack\Stack.vcxproj", "{A4F19B27-54C9-4841-98B0-728EDCD283D2}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
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+		{A4F19B27-54C9-4841-98B0-728EDCD283D2}.Release|x64.Build.0 = Release|x64
+		{A4F19B27-54C9-4841-98B0-728EDCD283D2}.Release|x86.ActiveCfg = Release|Win32
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+		SolutionGuid = {5B7E38AF-1E89-49D4-95EB-B55DB0F7ADDF}
+	EndGlobalSection
+EndGlobal

Stack/Stack/Main.c

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+#include "StackTest.h"
+#include <stdio.h>
+
+int main()
+{
+    if (!pushTest() || !popTest() || !deleteStackTest() || !topTest())
+    {
+        printf("Test failed");
+        return -1;
+    }
+}

Stack/Stack/Stack.c

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+#include "Stack.h"
+#include <malloc.h>
+
+bool isEmpty(Stack* head)
+{
+    return head == NULL;
+}
+
+void push(Stack** head, char element)
+{
+    Stack* newStack = (Stack*)calloc(1, sizeof(Stack));
+    if (newStack == NULL)
+    {
+        return;
+    }
+    newStack->value = element;
+    newStack->next = *head;
+    *head = newStack;
+}
+
+char pop(Stack** head, int* error)
+{
+    *error = 0;
+    if (*head != NULL)
+    {
+        const char element = (*head)->value;
+        Stack* temporary = *head;
+        *head = (*head)->next;
+        free(temporary);
+        return element;
+    }
+    *error = 1;
+    return 0;
+}
+
+void deleteStack(Stack** head)
+{
+    int error = 0;
+    while (!isEmpty(*head))
+    {
+        pop(head, &error);
+    }
+}
+
+char top(Stack** head, int* error)
+{
+    *error =  0;
+    if (!isEmpty(*head))
+    {
+        return (*head)->value;
+    }
+    *error = 1;
+    return 0;
+}

Stack/Stack/Stack.h

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+#pragma once
+#include <stdbool.h>
+
+// Structure for implementing a stack consisting of a value and a pointer to the next element
+typedef struct Stack
+{
+    char value;
+    struct Stack* next;
+} Stack;
+
+// Function for testing if stack is empty
+bool isEmpty(Stack* head);
+
+// Function for adding an element to the top of the stack
+void push(Stack** head, char element);
+
+// Function to remove an element from the top of the stack that returns the value of that element
+char pop(Stack** head, int* error);
+
+// Function for deleting all stack elements
+void deleteStack(Stack** head);
+
+// Function that returns the value of an element from the top of the stack
+char top(Stack** head, int* error);

Stack/Stack/Stack.vcxproj

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Stack/Stack/Stack.vcxproj.filters

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Stack/Stack/StackTest.c

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+#include "StackTest.h"
+#include "Stack.h"
+#include <stdio.h>
+
+bool pushTest()
+{
+    Stack* head = NULL;
+    push(&head, '[');
+    const char firstResult = head->value;
+    push(&head, ')');
+    const char secondResult = head->value;
+    deleteStack(&head);
+    return firstResult == '[' && secondResult == ')';
+}
+
+bool popTest()
+{
+    Stack* head = NULL;
+    push(&head, 'a');
+    push(&head, '^');
+    push(&head, '1');
+    int error = 0;
+    const char firstPopResult = pop(&head, &error);
+    if (error == 1)
+    {
+        return false;
+    }
+    const char firstUpperElement = head->value;
+    const char secondPopResult = pop(&head, &error);
+    if (error == 1)
+    {
+        return false;
+    }
+    const char secondUpperElement = head->value;
+    deleteStack(&head);
+    return firstPopResult == '1' && firstUpperElement == '^' && secondPopResult == '^' && secondUpperElement == 'a';
+}
+
+bool deleteStackTest()
+{
+    Stack* head = NULL;
+    push(&head, 'a');
+    push(&head, 'b');
+    push(&head, 'c');
+    deleteStack(&head);
+    return head == NULL;
+}
+
+bool topTest()
+{
+    Stack* head = NULL;
+    push(&head, 'a');
+    int error = 0;
+    const char firstTopResult = top(&head, &error);
+    if (error == 1)
+    {
+        return false;
+    }
+    push(&head, '^');
+    const char secondTopResult = top(&head, &error);
+    if (error == 1)
+    {
+        return false;
+    }
+    push(&head, '1');
+    const char thirdTopResult = top(&head, &error);
+    if (error == 1)
+    {
+        return false;
+    }
+    deleteStack(&head);
+    return firstTopResult == 'a' && secondTopResult == '^' && thirdTopResult == '1';
+}