60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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void encode(char message[]) {
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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'};
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for (int k = 1; k < 26; k++) {
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for (int i = 0; i < strlen(message); i++) {
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for (int j = 0; j < 26; j++) {
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if (alphabet[j] == message[i]) {
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message[i] = alphabet[j+k];
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break;
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}
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}
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}
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printf("\nEncoded with shift %d: %s\n", k, message);
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}
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}
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void decode(char message[]) {
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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'};
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for (int k = 1; k < 26; k++) {
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for (int i = 0; i < strlen(message); i++) {
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for (int j = 26; j < 52; j++) {
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if (alphabet[j] == message[i]) {
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message[i] = alphabet[j-k];
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break;
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}
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}
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}
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printf("\nDecoded with shift %d: %s\n", k, message);
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}
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}
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int main() {
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char ar[1000];
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printf("Enter the message\n");
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scanf("%[^\n]", &ar);
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int option = -1;
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printf("Encode or decode? 0 or 1\n");
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scanf("%d", &option);
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while (option == 0 || option == 1) {
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switch (option) {
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case 0:
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encode(ar);
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option = -1;
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break;
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case 1:
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decode(ar);
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option = -1;
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break;
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default:
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printf("Please enter a valid number.\n");
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}
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}
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} |