Compilare: user.c: In function ‘main’: user.c:14:1: warning: implicit declaration of function ‘sqrt’ [-Wimplicit-function-declaration] if (sqrt(n)==(int)(sqrt(n))) ^ user.c:14:5: warning: incompatible implicit declaration of built-in function ‘sqrt’ [enabled by default] if (sqrt(n)==(int)(sqrt(n))) ^ user.c:15:5: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘double’ [-Wformat=] fprintf(f2,"%d\n",(sqrt(n)*4)); ^ user.c:10:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"%d",&T); ^ user.c:13:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"%d",&n); ^