View Compilation Error

0_0_39832441_3005.cpp: In function 'int read()':
0_0_39832441_3005.cpp:6:17: error: invalid conversion from 'int (*)()' to 'char' [-fpermissive]
    6 |         char ch=getchar;
      |                 ^~~~~~~
      |                 |
      |                 int (*)()
0_0_39832441_3005.cpp:7:31: error: invalid conversion from 'int (*)()' to 'char' [-fpermissive]
    7 |         while(ch<48||ch>57)ch=getchar;
      |                               ^~~~~~~
      |                               |
      |                               int (*)()
0_0_39832441_3005.cpp:8:55: error: invalid conversion from 'int (*)()' to 'char' [-fpermissive]
    8 |         while(ch>=48&&ch<=57)x=(x<<1)+(x<<3)+ch-48,ch=getchar;
      |                                                       ^~~~~~~
      |                                                       |
      |                                                       int (*)()