foo.c: In function 'main':
foo.c:6:9: warning: implicit declaration of function 'scanf_s'; did you mean 'scanf'? [-Wimplicit-function-declaration]
    6 |         scanf_s("%d",&i);
      |         ^~~~~~~
      |         scanf
foo.c:14:11: warning: 'j' may be used uninitialized [-Wmaybe-uninitialized]
   14 |         if(j==a)
      |           ^
foo.c:5:11: note: 'j' was declared here
    5 |     int i,j;
      |           ^
/nix/store/j2gmfdd29cp3rcvghmn1a5kgcnmf8myp-binutils-2.40/bin/ld: /tmp/ccH9duoS.o: in function `main':
foo.c:(.text.startup+0x12): undefined reference to `scanf_s'
collect2: error: ld returned 1 exit status

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