1#include2#include3usingnamespacestd;4stringstr;5charline;6stringnum;7strings;8intflag=0;910stringkey[]={"main","if","else","for","while","int"};1112intmain()13{14while(cin.get(line))15{16str+=line;17}18for(inti=0;i)19{20//运算符：=+-*/>===!=21//判断加减乘除22if(str[i]=='+'||str[i]=='-'||str[i]=='*'||str[i]=