c语言课后习题将“China”译成密码

#include <stdio.h>int main(){    char c1='C',c2='h',c3='i',c4='n',c5='a';    c1=c1+4;    c2=c2+4;    c3=c3+4;    c4=c4+4;    c5=c5+4;    putchar(c1);    putchar(c2);    putchar(c3);    putchar(c4);    putchar(c5);    printf("\n");    printf("%c,%c,%c,%c,%c\n",c1,c2,c3,c4,c5);    return 0;}