/in/foo.c: In function 'main':
/in/foo.c:5:6: error: redeclaration of 'i' with no linkage
  int i,j=0,t,h=0,k;
      ^
/in/foo.c:4:6: note: previous declaration of 'i' was here
  int i,S[i],c[5],A[5];
      ^