Compilare: user.c: In function ‘suma’: user.c:5:9: warning: implicit declaration of function ‘abs’ [-Wimplicit-function-declaration] *s=(abs(x*x%p-x%p))%p; ^ user.c: In function ‘main’: user.c:19:5: warning: format ‘%d’ expects argument of type ‘int *’, but argument 3 has type ‘long int *’ [-Wformat=] fscanf(fp,"%d",&n); ^ user.c:19:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fp,"%d",&n); ^ user.c:20:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fp,"%d",&p); ^