Compilare: user.c: In function ‘main’: user.c:16:1: warning: implicit declaration of function ‘memset’ [-Wimplicit-function-declaration] memset(digits, 0, 10 * sizeof(int)); ^ user.c:16:1: warning: incompatible implicit declaration of built-in function ‘memset’ [enabled by default] user.c:9:16: warning: unused variable ‘p’ [-Wunused-variable] int sigma = 0, p = 1; ^ user.c:8:14: warning: unused variable ‘v’ [-Wunused-variable] int i, a, b, v, absLength; ^ user.c:15:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%d", &length); ^ user.c:57:8: warning: ‘smen’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(file2, "%c", smen); ^