/in/foo.c: In function 'main':
/in/foo.c:5:16: warning: unused variable 'x' [-Wunused-variable]
  int m,n,o,i,j,x;
                ^
/in/foo.c:5:14: warning: unused variable 'j' [-Wunused-variable]
  int m,n,o,i,j,x;
              ^
/in/foo.c: In function 'B':
/in/foo.c:30:12: warning: unused variable 'k' [-Wunused-variable]
  int i,j=0,k=0;
            ^