/in/foo.c: In function 'main':
/in/foo.c:39:8: error: 'q' undeclared (first use in this function)
    for(q=g-1; q>=0; q--)
        ^
/in/foo.c:39:8: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c: In function 'plus1':
/in/foo.c:70:7: error: 'm' undeclared (first use in this function)
  if(a[m]!=0)
       ^
/in/foo.c: In function 'plus2':
/in/foo.c:83:7: error: 'm' undeclared (first use in this function)
  if(b[m]!=0)
       ^
/in/foo.c: In function 'plus1':
/in/foo.c:73:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
/in/foo.c: In function 'plus2':
/in/foo.c:87:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^