for后面多个不同的else if怎么加{}?答:int main(){ char str[]="Room C209, Petroleum Science and Technology Building, 1 Daxue Road, Caidian District, Wuhan, Hubei 430100, China";int a=0,b=0,c=0,d=0,e=0;char ch;for(int i=0;(ch=str[i]!='\0';i ){ if(ch=' '){ a++ ;} else if((ch>='0')&&(...