Commit with the first 3 excercises done

.vscode/c_cpp_properties.json

@@ -0,0 +1,21 @@
+{
+    "configurations": [
+        {
+            "name": "Win32",
+            "includePath": [
+                "${workspaceFolder}/**"
+            ],
+            "defines": [
+                "_DEBUG",
+                "UNICODE",
+                "_UNICODE"
+            ],
+            "windowsSdkVersion": "10.0.22621.0",
+            "compilerPath": "cl.exe",
+            "cStandard": "c17",
+            "cppStandard": "c++17",
+            "intelliSenseMode": "windows-msvc-x64"
+        }
+    ],
+    "version": 4
+}

.vscode/tasks.json

@@ -0,0 +1,28 @@
+{
+    "tasks": [
+        {
+            "type": "cppbuild",
+            "label": "C/C++: gcc.exe build active file",
+            "command": "C:\\msys64\\mingw64\\bin\\gcc.exe",
+            "args": [
+                "-fdiagnostics-color=always",
+                "-g",
+                "${file}",
+                "-o",
+                "${fileDirname}\\${fileBasenameNoExtension}.exe"
+            ],
+            "options": {
+                "cwd": "${fileDirname}"
+            },
+            "problemMatcher": [
+                "$gcc"
+            ],
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            },
+            "detail": "Task generated by Debugger."
+        }
+    ],
+    "version": "2.0.0"
+}

excercise_1/banking.c

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+/*
+1. Create an online banking system with the following features:
+	* Users must be able to log in with a username and password.
+	* If the user enters the wrong credentials three times, the system must lock them out.
+	* The initial balance in the bank account is $2000.
+	* The system must allow users to deposit, withdraw, view, and transfer money.
+	* The system must display a menu for users to perform transactions.2.
+*/
+
+// Libraries used for this excercise
+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+#include <conio.h>
+
+struct user
+{
+	char username[30];
+	char password[30];
+	int balance;
+	int failedAttempts;
+};
+
+// Global Variables
+// Convertion based on the usd exchange rate
+struct user users[2] = {{"roger", "12345", 2000, 0}, {"maria", "12345", 2000, 0}};
+int size = sizeof(users) / sizeof(users[0]);
+bool logedIn = false;
+int currentUser;
+int menuOpt;
+char auxUser[30];
+char auxPassword[30];
+char anyK;
+
+// Function that returns user position in the users array.
+int getID(char *usr)
+{
+	int val = -1;
+	for (int i = 0; i < size; i++)
+	{
+		if (strcmp(users[i].username, usr) == 0)
+		{
+			val = i;
+		};
+	};
+	return val;
+};
+
+// Function that compares if password for the user is correct.
+bool login(int id, char *passw)
+{
+	if (strcmp(users[id].password, passw) == 0)
+	{
+		return true;
+	}
+	else
+	{
+		users[id].failedAttempts++;
+		return false;
+	}
+}
+
+int main()
+{
+	printf("Welcome to the RBank banking system\n");
+	printf("-----------------------------------\n");
+	while (1)
+	{
+		// Login section
+		if (!logedIn)
+		{
+			printf("Please input username: ");
+			fflush(stdin);
+			scanf("%s", auxUser);
+			currentUser = getID(auxUser);
+			if (currentUser > -1)
+			{
+				printf("Please input password: ");
+				fflush(stdin);
+				scanf("%s", auxPassword);
+				if (users[currentUser].failedAttempts < 3)
+				{
+					bool log = login(currentUser, auxPassword);
+					if (log)
+					{
+						logedIn = true;
+						printf("-----------------------------------\n");
+						printf("Login Succesfull\n");
+						printf("-----------------------------------\n");
+					}
+					else
+					{
+						printf("-----------------------------------\n");
+						printf("Wrong Password!!!\n");
+						printf("-----------------------------------\n");
+					}
+				}
+				else
+				{
+					printf("-----------------------------------\n");
+					printf("User is blocked, please go to your nearest RBank office!\n");
+					printf("-----------------------------------\n");
+				}
+			}
+			else
+			{
+				printf("-----------------------------------\n");
+				printf("Error, invalid user!\n");
+				printf("-----------------------------------\n");
+			};
+		}
+		else
+		{
+			// Once loged in you can select an operation in the menu.
+			menuOpt = -1;
+			printf("-> Input 1 to deposit to your account:\n");
+			printf("-> Input 2 to withdraw from your account:\n");
+			printf("-> Input 3 to view your current balance:\n");
+			printf("-> Input 4 to transfer to Another account:\n");
+			printf("-> Input 5 to logout:\n");
+			printf("-> Input 6 to exit the banking system:\n");
+			printf("Select transaction: ");
+			fflush(stdin);
+			scanf("%d", &menuOpt);
+			switch (menuOpt)
+			{
+			case 1:
+				int deposit;
+				printf("-> Please input amount you wish to deposit: ");
+				fflush(stdin);
+				scanf("%d", &deposit);
+				users[currentUser].balance += deposit;
+				break;
+			case 2:
+				int withdraw;
+				printf("-> Please input amount you wish to withdraw: ");
+				fflush(stdin);
+				scanf("%d", &withdraw);
+				users[currentUser].balance -= withdraw;
+				break;
+			case 3:
+				printf("-----------------------------------\n");
+				printf("-> The current balance of your account is: %d\n", users[currentUser].balance);
+				printf("-> Press any key to continue ....\n");
+				printf("-----------------------------------\n");
+				fflush(stdin);
+				getch();
+				break;
+			case 4:
+				int amount;
+				char recipient[30];
+				int recipientID;
+				printf("-----------------------------------\n");
+				while (true)
+				{
+					printf("-> Input the username you wish to transfer to: ");
+					fflush(stdin);
+					scanf("%s", recipient);
+					recipientID = getID(recipient);
+					if (recipientID > -1)
+					{
+						printf("-> Input the amount you wish to transfer: ");
+						fflush(stdin);
+						scanf("%d", &amount);
+						if (users[currentUser].balance >= amount)
+						{
+							users[currentUser].balance -= amount;
+							users[recipientID].balance += amount;
+						}
+						else
+						{
+							printf("-----------------------------------\n");
+							printf("You dont have enough funds, transference aborted!\n");
+							printf("-----------------------------------\n");
+						}
+						break;
+					}
+					else
+					{
+						printf("Recipient for transfer doesnt exist. Do you want to try again Y/N: ");
+						char try = ' ';
+						fflush(stdin);
+						scanf("%c", &try);
+						if (try == 'N' || try == 'n')
+						{
+							break;
+						}
+					}
+				}
+				printf("-----------------------------------\n");
+				break;
+			case 5:
+				logedIn = false;
+				currentUser = -1;
+				printf("-----------------------------------\n");
+				printf("Please Login again:\n");
+				printf("-----------------------------------\n");
+				break;
+			case 6:
+				printf("-----------------------------------\n");
+				printf("Thanks for using the RBank banking system:\n");
+				printf("-----------------------------------\n");
+				goto exit;
+				break;
+			}
+		}
+	}
+exit:
+	return 0;
+}