凯撒密码的c语言编写

#include "stdafx.h" void main() { char M[100],C[100]; int K=3,i; printf("**************凯撒密码**************\n"); printf("请输入明文:\n"); gets(M); for (i=0;M[i]!='\0';i++) C[i]=(M[i]-'a'+K)%26+'a'; C[i]='\0'; printf("密文是:\n%s\n",C); }