gotoagain;if(ch=='Y'||ch=='y'#defineLEFT260

C语言~main( ) { char ch; ch=getchar( ); if (ch>='A' && ch CH3-CH=CH-CH=CH-CH3是否存在? CH3-CH=CH-C≡CH 如何命名? CH2=CH-CH=CH2 CH3CH=CH-CH=CH2 + Br2? CH3-CH=CH-CH3命名 CH2=CH-CH(CH3)-CH2OH是什么? 关于有机物HOOC-CH=CH-CH2OH HOOC-CH=CH-CH2OH是什么 char a=0,ch; while((ch=getchar())!='\n') { if(a%2!=0&&(ch>=' 3． 如果有变量定义：char ch,*p=&ch; 要将'y'赋值给ch,要求通过指针变量p实现,请写出表达式. while(ch!='\r')