foo.c: In function 'main':
foo.c:5:19: warning: variable 't' set but not used [-Wunused-but-set-variable]
    5 |   int n,i,m,x,y,z,t=0;
      |                   ^
foo.c:7:8: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
    7 |   { n=a+b+c;
      |       ~^~
foo.c:7:8: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized]

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