all done, just adding tests for redundancy

CMakeLists.txt

@@ -20,6 +20,7 @@ add_compile_options(
 
 add_executable(main_exec
     src/main.cpp
+    src/utils.cpp
 )
 
 target_include_directories(main_exec

include/stack.h

@@ -39,11 +39,9 @@ public:
 template <typename T>
 requires std::formattable<T, char>
 Stack<T>::Stack() {
-    Stack<T> new_stack;
-    new_stack.data = new T[DEFAULT_STACK_SIZE];
-    new_stack.cap = 0;
-    new_stack.len = 0;
-    return new_stack;
+    this->data = new T[DEFAULT_STACK_SIZE];
+    this->cap = DEFAULT_STACK_SIZE;
+    this->len = 0;
 }
 
 template <typename T>
@@ -109,7 +107,7 @@ std::expected<T, StackErr> Stack<T>::pop() {
         this->cap = new_capacity;
     }
 
-    return std::expected(return_val);
+    return return_val;
 }
 
 template <typename T>
@@ -119,7 +117,7 @@ std::expected<T, StackErr> Stack<T>::peek() {
         return std::unexpected(StackErr::empty);
     }
 
-    return std::expected(this->data[this->len - 1]);
+    return this->data[this->len - 1];
 }
 
 template <typename T>
@@ -129,15 +127,15 @@ void Stack<T>::print() {
     std::println("Length: {}.", this->len);
     std::println("Capacity: {}.", this->cap);
     
-    std::println("{:^20}", "Datos");
-    std::println("{:^20}", "|");
-    std::println("{:^20}", "v");
+    std::println("{:^22}", "Datos");
+    std::println("{:^22}", "|");
+    std::println("{:^22}", "v");
 
-    for (int i = 0; i < this->cap; i++) {
+    for (uint64_t i = 0; i < this->cap; i++) {
         if (i < this->len) {
-            std::println("{:^20}", this->data[i]);
+            std::println("[{:^20}]", this->data[i]);
         } else {
-            std::println("{:^20}", "NULL");
+            std::println("[{:^20}]", "EMPTY");
         }
     }
 }

include/utils.h

@@ -0,0 +1,14 @@
+#ifndef UTILS_H
+#define UTILS_H
+
+#include <stddef.h>
+#include <stdio.h>
+
+void clear_screen();
+void wait_enter();
+void sleep_seconds(size_t s);
+void read_string(const char *message, char **dest);
+int read_int(const char *message, int *dest);
+int read_double(const char *message, double *dest);
+
+#endif // !

src/main.cpp

@@ -1,7 +1,92 @@
-#include "stack"
+#include "stack.h"
+#include "utils.h"
+#include <cstdlib>
 #include <print>
 
+void menu(Stack<int> stack);
+
 int main(void) {
-    std::print("hola");
+    Stack<int> stack = {};
+    menu(stack);
     return 0;
 }
+
+void menu(Stack<int> stack) {
+    while (true) {
+        clear_screen();
+        std::println("--Stack Manager--");
+        std::println("1) Pop.");
+        std::println("2) Peek.");
+        std::println("3) Push.");
+        std::println("4) Print.");
+        std::println("5) Exit");
+        int choice;
+        if (!read_int("", &choice)) {
+            std::print("Invalid input, try again.");
+            wait_enter();
+            clear_screen();
+            continue;
+        }
+
+        clear_screen();
+        switch (choice) {
+            case 1: {
+                auto pop_val = stack.pop();
+
+                if (pop_val.has_value()) {
+                    std::println("The value at the top of the stack was {}.", pop_val.value());
+                } else if (pop_val.error() == StackErr::empty) {
+                    std::println("The stack is empty.");
+                } else {
+                    std::println("The system couldn't allocate memory fo the stack.");
+                }
+
+                wait_enter();
+                clear_screen();
+                break;
+                }
+            case 2: {
+                auto peek_val = stack.peek();
+
+                if (peek_val.has_value()) {
+                    std::println("The value at the top of the stack is {}.", peek_val.value());
+                } else {
+                    std::println("The stack is empty.");
+                }
+
+                wait_enter();
+                clear_screen();
+                break;
+                }
+            case 3: {
+                int val;
+                if (!read_int("Enter a number to push into the stack.\n", &val)) {
+                    std::println("Invalid input.");
+                    continue;
+                }
+
+                stack.push(val);
+                std::println("The value {} was correclty pushed into the stack.", val);
+                wait_enter();
+                break;
+                }
+            case 4: {
+                stack.print();
+                wait_enter();
+                break;
+                }
+            case 5: {
+                std::println("Goodbye :)");
+                wait_enter();
+                clear_screen();
+                exit(1);
+                }
+            default: {
+                std::println("Invalid option.");
+                wait_enter();
+                break;
+                }
+        }
+
+    }
+}

src/utils.cpp

@@ -0,0 +1,129 @@
+#include "utils.h"
+#include <limits.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+
+void clear_screen() {
+    printf("\033[2J\033[H");
+    fflush(stdout);
+}
+
+void wait_enter() {
+    int c;
+    printf("Press Enter to continue...");
+    fflush(stdout);
+
+    while ((c = getchar()) != '\n' && c != EOF) {
+        ;
+    }
+}
+
+void sleep_seconds(size_t s) {
+    #ifdef _WIN32
+        #include <windows.h>
+        Sleep(s * 1000);
+    #else 
+        // #include <unistd.h>
+        // sleep(s); 
+    #endif /* ifdef _WIN32
+         */
+}
+
+void read_string(const char *message, char **dest) {
+    if (!dest) {
+        return;
+    }
+
+    printf("%s", message);
+
+    char buffer[256]; // I mean, should be enough
+    if (!fgets(buffer, sizeof(buffer), stdin))
+        return;
+
+    buffer[strcspn(buffer, "\n")] = '\0';
+
+    char *tmp = static_cast<char *>(malloc(strlen(buffer) + 1));
+    if (!tmp) {
+        return;
+    }
+
+    strcpy(tmp, buffer);
+
+    free(*dest);
+    *dest = tmp;
+}
+
+int read_int(const char *message, int *dest) {
+    char buffer[64];
+    char *end;
+    long value;
+
+    printf("%s", message);
+    fflush(stdout);
+
+    if (!fgets(buffer, sizeof(buffer), stdin)) {
+        return 0;
+    }
+
+    errno = 0;
+    value = strtol(buffer, &end, 10);
+
+    if (errno != 0) {
+        return 0;
+    }
+
+    if (end == buffer) {
+        return 0;
+    }
+
+    if (*end != '\n' && *end != '\0') {
+        return 0;
+    }
+
+    if (value < INT_MIN || value > INT_MAX) {
+        return 0;
+    }
+
+    *dest = (int)value;
+    return 1;
+}
+
+int read_double(const char *message, double *dest) {
+    char buffer[64];
+    char *end;
+    double value;
+
+    printf("%s", message);
+    fflush(stdout);
+
+    if (!fgets(buffer, sizeof(buffer), stdin)) {
+        return 0;
+    }
+
+    errno = 0;
+    value = strtod(buffer, &end);
+
+    if (errno != 0) {
+        return 0;
+    }
+
+    if (end == buffer) {
+        return 0;
+    }
+
+    if (*end != '\n' && *end != '\0') {
+        return 0;
+    }
+
+    if (!isfinite(value)) {
+        return 0;
+    }
+
+    *dest = value;
+    return 1;
+}