Compilare: user.c: In function ‘main’: user.c:23:9: warning: pointer targets in passing argument 1 of ‘strlen’ differ in signedness [-Wpointer-sign] short int lnr=strlen(nr); ^ In file included from user.c:3:0: /usr/include/string.h:399:15: note: expected ‘const char *’ but argument is of type ‘unsigned char *’ extern size_t strlen (__const char *__s) ^ user.c:11:26: warning: unused variable ‘k’ [-Wunused-variable] int uc[10][4], i, j, k; ^ user.c:19:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&t); ^ user.c:22:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%s",nr); ^