foo.cc: In function 'int main()':
foo.cc:12:17: error: 'buffer' was not declared in this scope
         memmove(buffer,text+a,sizeof(int)*len);//待粘贴数字
                 ^~~~~~
foo.cc:12:17: note: suggested alternative: 'setbuffer'
         memmove(buffer,text+a,sizeof(int)*len);//待粘贴数字
                 ^~~~~~
                 setbuffer

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