Compilare: user.c: In function ‘test’: user.c:4:5: warning: implicit declaration of function ‘sqrt’ [-Wimplicit-function-declaration] int i, sqrtN = sqrt(n); ^ user.c:4:20: warning: incompatible implicit declaration of built-in function ‘sqrt’ [enabled by default] int i, sqrtN = sqrt(n); ^ user.c: In function ‘main’: user.c:16:17: warning: unused variable ‘i’ [-Wunused-variable] int N, Ai, max, i; ^ user.c:21:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%d", &N); ^ user.c:24:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%d", &Ai); ^ user.c:27:4: warning: ‘max’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(!(max%2)) max+=1; ^