Added cipher programs

2023-02-14 20:44:42 +01:00
parent ca033aa57d
commit 79bb71732b
4 changed files with 272 additions and 0 deletions
@@ -0,0 +1,39 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+void encode(char message[], int shift) {
+    char alphabet[52] = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'};
+
+    for (int i = 0; i < strlen(message); i++) {
+        for (int j = 0; j < 26; j++) {
+            if (alphabet[j] == message[i]) {
+                message[i] = alphabet[j+shift];
+                break;
+            }
+        }
+    }
+}
+
+void decode(char message[], int shift) {
+    char alphabet[52] = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'};
+
+    for (int i = 0; i < strlen(message); i++) {
+        for (int j = 26; j < 52; j++) {
+            if (alphabet[j] == message[i]) {
+                message[i] = alphabet[j-shift];
+                break;
+            }
+        }
+    }
+}
+
+int main() {
+    char ar[1000];
+    scanf("%[^\n]", &ar);
+    encode(ar, 25);
+    printf("Encoded: %s\n", ar);
+
+    decode(ar, 25);
+    printf("\nDecoded: %s\n", ar);
+}