foo.c: In function 'main':
foo.c:8:7: warning: statement with no effect [-Wunused-value]
    8 |  for(k<1;k<100;k++)
      |      ~^~
foo.c:5:9: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized]
    5 |     int k;
      |         ^

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