【c语言】译密码。将字母变成其后的第4个字母，非字母不变

// 译密码。将字母变成其后的第4个字母，非字母不变#include <stdio.h>int main(){char c;c = getchar();while( c != '\n' ){if( ( c >= 'a' && c <= 'z' ) || ( c >= 'A' && c <= 'Z' ) ){if( ( c >= 'w' && c <= 'z' ) || ( c >= 'W' && c <= 'Z' ) ){c = c - 22;}elsec = c + 4;}printf("%c",c);c = getchar();}printf("\n");return 0;}<img src="http://img.blog.csdn.net/20150424153229200?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvemhhb3lhcWlhbjU1Mg==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />