Compilare: user.c: In function ‘creare_prefix’: user.c:24:9: warning: suggest parentheses around assignment used as truth value [-Wparentheses] if (N[k+1]=N[i]) ^ user.c: In function ‘main’: user.c:76:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.in", "r", stdin); ^ user.c:77:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.out", "w", stdout); ^ user.c:79:10: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(N, sizeof(N), stdin); ^ user.c:80:10: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(M, sizeof(M), stdin); ^