password-read-write

.vscode/tasks.json

@@ -0,0 +1,28 @@
+{
+    "tasks": [
+        {
+            "type": "cppbuild",
+            "label": "C/C++: g++.exe build active file",
+            "command": "C:\\msys64\\ucrt64\\bin\\g++.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"
+}

pass.dat

@@ -0,0 +1 @@
+errr

pswd.cpp

@@ -0,0 +1,51 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <conio.h>
+
+int main()
+{
+    char k1,k2,k3,k4;
+    char c1,c2,c3,c4;
+    char sel;
+
+    FILE*fp;
+    fp=fopen(".\\pass.dat","r");
+    printf("選擇您的動作: (a.修改系統內建密碼) (b.測試輸入密碼),不分大小寫: ");
+    scanf("%c",&sel);
+    if(sel=='a'||sel=='A'){
+        printf("請輸入新密碼\n");
+        c1=getch();
+        printf("x");
+        c2=getch();
+        printf("x");
+        c3=getch();
+        printf("x");
+        c4=getch();
+        printf("x\n");
+        fp=fopen(".\\pass.dat","w");
+        fprintf(fp,"%c%c%c%c",c1,c2,c3,c4);
+        fclose(fp);
+        printf("密碼修改完成\n");
+        return 0;
+    }else if(sel=='b'||sel=='B'){
+        printf("請輸入密碼\n");
+        c1=getch();
+        printf("x");
+        c2=getch();
+        printf("x");
+        c3=getch();
+        printf("x");
+        c4=getch();
+        printf("x\n");
+        fp=fopen(".\\pass.dat","r");
+        fscanf(fp,"%c%c%c%c",&k1,&k2,&k3,&k4);
+        if(c1==k1&c2==k2&c3==k3&c4==k4){
+            printf("恭喜你，輸入正確\n");
+        }else{
+            printf("輸入錯誤，請重新輸入!\n");
+        }
+        fclose(fp);
+        return 0;
+
+}
+}