/in/foo.cc:1:9: error: #include expects "FILENAME" or <FILENAME>
 #include
         ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:5:15: error: 'scanf' was not declared in this scope
 scanf("%c",&c1);
               ^
/in/foo.cc:7:85: error: 'printf' was not declared in this scope
 printf("大写字符%c对应的小写字母是%c,小写字符的ASCII是%d",c1,c2,c2);
                                                                                     ^