foo.c: In function 'main':
foo.c:6:19: warning: variable 'xx1' set but not used [-Wunused-but-set-variable]
    6 |         int xx,yy,xx1,yy1;
      |                   ^~~
foo.c:6:13: warning: variable 'xx' set but not used [-Wunused-but-set-variable]
    6 |         int xx,yy,xx1,yy1;
      |             ^~
foo.c:5:25: warning: unused variable 'z1' [-Wunused-variable]
    5 |         int x,y,z,x1,y1,z1,a,m,n,p,q,t=0;
      |                         ^~

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