Compilare: user.c: In function ‘main’: user.c:28:5: warning: implicit declaration of function ‘malloc’ [-Wimplicit-function-declaration] string = (char *)malloc(SIZE); ^ user.c:28:22: warning: incompatible implicit declaration of built-in function ‘malloc’ [enabled by default] string = (char *)malloc(SIZE); ^ user.c:26:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d\n", &N); ^ user.c:29:10: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(string, SIZE - 1, in); ^