/in/hw4.c: In function 'dec':
/in/hw4.c:7:12: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
     return y;
            ^
/in/hw4.c: In function 'hex':
/in/hw4.c:13:12: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
     return y;
            ^
/in/hw4.c: In function 'main':
/in/hw4.c:43:25: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
         e[i]=hex(p);f[i]=hex(q);
                     ~~~~^~~~~~~
/in/hw4.c:43:13: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
         e[i]=hex(p);f[i]=hex(q);
         ~~~~^~~~~~~
/in/hw4.c:32:10: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
         q=dec(a[i])-dec(b[i])-dec(d[i]);
         ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/in/hw4.c:32:20: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
         q=dec(a[i])-dec(b[i])-dec(d[i]);
           ~~~~~~~~~^~~~~~~~~~
/in/hw4.c:32:20: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
/in/hw4.c:31:10: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
         p=dec(a[i])+dec(b[i])+dec(c[i]);
         ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/in/hw4.c:31:20: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
         p=dec(a[i])+dec(b[i])+dec(c[i]);
           ~~~~~~~~~^~~~~~~~~~
/in/hw4.c:31:20: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]