코딩/C언어
암호화(시저암호)
런던전통손만두
2019. 9. 17. 17:50
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#include <stdio.h>
#include <ctype.h>
#include <string.h>
void printCode(char code[])
{
int i;
printf("--------------------------------------------------------\n");
printf("alphabet:\tABCDEFGHIJKLMNOPQRSTUVWXYZ\n");
printf("encoded:\t");
for (i = 0; i < 26; i++)
printf("%c", code[i]);
printf("\n--------------------------------------------------------\n");
}
void makeCode(char code[], int distance)
{
int i, j = 0;
for (i = 26 - distance; j < 26; i++, j++)
{
code[i] = 'A' + j;
if (i >= 25)
i = -1;
}
}
void encode(char code[], char sentence[], char encodedSentence[])
{
int i, index;
for (i = 0; sentence[i] != '\0'; i++)
{
if (isalpha(sentence[i]) != 0)
{
index = (int)(sentence[i] - 'A');
encodedSentence[i] = code[index];
}
else
encodedSentence[i] = sentence[i];
}
encodedSentence[i] = '\0';
}
void clear_stdin()
{
int ch;
while ((ch = getchar()) != EOF && ch != '\n') {};
}
int main(void)
{
char code[26];
int distance;
char sentence[80], encodedSentence[80];
printf("Enter a distance for encoding: ");
scanf("%d", &distance);
makeCode(code, distance);
printCode(code);
//fflush(stdin) 버퍼 비우는 코드인데, 동작을 안한다
//while (getchar() != '\0'); 오류!
clear_stdin();
printf("Enter a sentence to encode: ");
gets(sentence);
printf("original sentence:\t");
puts(sentence);
encode(code, sentence, encodedSentence);
printf("encoded sentence:\t");
puts(encodedSentence);
}
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cs |
결과:
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