Compilare: user.c: In function ‘main’: user.c:11:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.in" , "r" , stdin ); ^ user.c:12:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.out" , "w" , stdout ); ^ user.c:14:7: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s%s" , A+1 , B+1); ^