/in/foo.c: In function 'main':
/in/foo.c:6:14: warning: unused variable 'x' [-Wunused-variable]
  int m,n,i,j,x;
              ^
/in/foo.c:6:12: warning: unused variable 'j' [-Wunused-variable]
  int m,n,i,j,x;
            ^
/in/foo.c:27:5: warning: 'amin' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if(a[i]>amin && a[i]<0)
     ^
/in/foo.c:19:8: note: 'amin' was declared here
  int i,amin;
        ^~~~
/in/foo.c:27:5: warning: 'amin' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if(a[i]>amin && a[i]<0)
     ^
/in/foo.c:19:8: note: 'amin' was declared here
  int i,amin;
        ^~~~
/in/foo.c: In function 'A':
/in/foo.c:27:5: warning: 'amin' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if(a[i]>amin && a[i]<0)
     ^