foo.c: In function 'main':
foo.c:5:17: warning: unused variable 'p' [-Wunused-variable]
    5 |         int n,m,p;
      |                 ^
foo.c:8:18: warning: 'm' is used uninitialized [-Wuninitialized]
    8 |                 n=m*m;
      |                 ~^~~~
foo.c:5:15: note: 'm' was declared here
    5 |         int n,m,p;
      |               ^

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