Compilare: user.c:4:1: warning: return type defaults to ‘int’ [enabled by default] main() ^ user.c: In function ‘main’: user.c:20:2: warning: implicit declaration of function ‘calculx’ [-Wimplicit-function-declaration] nr = calculx(n); ^ user.c:17:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&n); ^ user.c:19:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&sir[i]); ^