Difference between revisions of "Practice Everyday"

Practice Everyday (view source)

949 bytes added , 11:02, 26 May 2023

326

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 *自己给自己写了一篇日记，研究研究能不能私密发布，公开发布不好。
+--- Joe version ---
+'''真正的私密'''
+<syntaxhighlight lang="c" line style="border: 1px dashed red;">
+#include <stdio.h>
+#include <string.h>
+// encrypt
+void encrypt(char *str, int key)
+{
+    int len = strlen(str);
+    for (int i = 0; i < len; i++)
+    {
+        str[i] += key;
+    }
+}
+// decrypt
+void decrypt(char *str, int key)
+{
+    int len = strlen(str);
+    for (int i = 0; i < len; i++)
+    {
+        str[i] -= key;
+    }
+}
+int main()
+{
+    char str[100];
+    int key;
+    // what do you want encrypt
+    printf("请输入要加密的字符串：");
+    fgets(str, sizeof(str), stdin);
+    printf("请输入密钥："); //Remeber it, it's important
+    scanf("%d", &key);
+    // encrypt what do you input
+    encrypt(str, key);
+    printf("加密后的字符串为：%s\n", str);
+    // decrypt what do you encrypted
+    decrypt(str, key);
+    printf("解密后的字符串为：%s\n", str);
+    return 0;
+}
+</syntaxhighlight>
 == Day 92 ==