Compilare: user.c: In function ‘main’: user.c:16:9: warning: implicit declaration of function ‘sqrt’ [-Wimplicit-function-declaration] a=sqrt(n); ^ user.c:16:11: warning: incompatible implicit declaration of built-in function ‘sqrt’ [enabled by default] a=sqrt(n); ^ user.c:11:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%ld",&t); ^ user.c:15:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%ld",&n); ^