/in/foo.c: In function 'main':
/in/foo.c:6:9: error: 'cin' undeclared (first use in this function)
    6 |         cin>>a>>b;
      |         ^~~
/in/foo.c:6:9: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:7:21: error: invalid operands to binary + (have 'int *' and 'int *')
    7 |     printf("%d%d",&a+&b);
      |                   ~~^~~
      |                   |  |
      |                   |  int *
      |                   int *