/in/foo.c: In function 'main':
/in/foo.c:7:1: error: 'i' undeclared (first use in this function)
 i=a;
 ^
/in/foo.c:7:1: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:3:13: warning: unused variable 'h' [-Wunused-variable]
 { int a,b,c,h;
             ^