/in/foo.cc: In function 'int main()':
/in/foo.cc:16:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   16 |     for(i=1;i<lena+lenb;i++)
      |     ^~~
/in/foo.cc:22:9: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   22 |         len=lena+lenb;//需要对c数组进行进位操作
      |         ^~~