foo.cc: In function ‘int fact(int)’:
foo.cc:6:17: error: ‘ans’ was not declared in this scope; did you mean ‘abs’?
    6 |                 ans=1;
      |                 ^~~
      |                 abs
foo.cc:7:9: error: ‘ans’ was not declared in this scope; did you mean ‘abs’?
    7 |         ans=n*fact(n-1);
      |         ^~~
      |         abs