foo.c: In function 'main':
foo.c:24:16: warning: unused variable 'lcm1' [-Wunused-variable]
  int gcd1 = x, lcm1 = x;
                ^~~~
foo.c:21:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &t);
  ^~~~~~~~~~~~~~~
foo.c:23:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &x);
  ^~~~~~~~~~~~~~~
foo.c:26:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &y);
   ^~~~~~~~~~~~~~~

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