/in/foo.cc: In function 'int main()':
/in/foo.cc:18:18: warning: 'z' may be used uninitialized in this function [-Wmaybe-uninitialized]
  int i,a,b,c,x,y,z;
                  ^
/in/foo.cc:45:6: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
  s2=b/y;
     ~^~
/in/foo.cc:44:6: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
  s1=a/x;
     ~^~
/in/foo.cc:46:6: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
  s3=c/z;
     ~^~