Borderou de evaluare (job #36400)

Eroare de compilare: user.c: In function ‘main’: user.c:4:32: error: ‘a’ undeclared (first use in this function) user.c:4:32: note: each undeclared identifier is reported only once for each function it appears in user.c:5:1: error: expected ‘;’ before ‘a’ user.c:15:1: warning: comparisons like ‘X<=Y<=Z’ do not have their mathematical meaning [-Wparentheses] user.c:15:1: warning: comparisons like ‘X<=Y<=Z’ do not have their mathematical meaning [-Wparentheses] user.c:15:1: warning: comparisons like ‘X<=Y<=Z’ do not have their mathematical meaning [-Wparentheses] user.c:17:1: error: ‘else’ without a previous ‘if’