%c",c);}}【源程序二】#include void main(){char c;while((c=getchar())!='\n'){if(c>='a' && c<='z')c='a'+(c-'a'+4)%26;else if(c>='A' && c<='Z')c='A'+(c-'A'+4)%26;}printf("%c",c);}}习题6.1【6.1】输入两个正整数m和n,求其最...