View Compilation Error

0_0_39651082_1179.cpp: In function 'int read()':
0_0_39651082_1179.cpp:57:33: error: 'gerchar' was not declared in this scope; did you mean 'getchar'?
   57 |         while (!isdigit(ch)) ch=gerchar();
      |                                 ^~~~~~~
      |                                 getchar