Compilare: main.cpp: In function 'int rec(long long int, long long int)': main.cpp:14:37: warning: unused variable 'x' [-Wunused-variable] long long cmmdc = gcd(a , b) , x , y,cmmmc; ^ main.cpp:14:41: warning: unused variable 'y' [-Wunused-variable] long long cmmdc = gcd(a , b) , x , y,cmmmc; ^ main.cpp:14:43: warning: unused variable 'cmmmc' [-Wunused-variable] long long cmmdc = gcd(a , b) , x , y,cmmmc; ^~~~~ main.cpp: In function 'int main()': main.cpp:53:23: warning: unused variable 'x' [-Wunused-variable] long long a , b , x , y , cmmdc; ^ main.cpp:53:27: warning: unused variable 'y' [-Wunused-variable] long long a , b , x , y , cmmdc; ^ main.cpp:53:31: warning: unused variable 'cmmdc' [-Wunused-variable] long long a , b , x , y , cmmdc; ^~~~~ main.cpp:54:25: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&t); ^ main.cpp:56:38: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%lld%lld",&a,&b); ^