Compilare: main.c: In function 'main': main.c:13:16: warning: passing argument 1 of 'sscanf' makes pointer from integer without a cast [-Wint-conversion] sscanf(a[i],fptr,"%d"); ^ In file included from /usr/include/features.h:367:0, from /usr/include/stdio.h:27, from main.c:1: /usr/include/stdio.h:448:12: note: expected 'const char * restrict' but argument is of type 'int' extern int __REDIRECT_NTH (sscanf, (const char *__restrict __s, ^ main.c:13:21: warning: passing argument 2 of 'sscanf' from incompatible pointer type [-Wincompatible-pointer-types] sscanf(a[i],fptr,"%d"); ^~~~ In file included from /usr/include/features.h:367:0, from /usr/include/stdio.h:27, from main.c:1: /usr/include/stdio.h:448:12: note: expected 'const char * restrict' but argument is of type 'FILE * {aka struct _IO_FILE *}' extern int __REDIRECT_NTH (sscanf, (const char *__restrict __s, ^ main.c:13:17: warning: 'a[0]' is used uninitialized in this function [-Wuninitialized] sscanf(a[i],fptr,"%d"); ~^~~ main.c:13:17: warning: 'a[1]' is used uninitialized in this function [-Wuninitialized]