Compilare: user.cpp: In function ‘int cmmdc(int, int)’: user.cpp:5:9: warning: unused variable ‘co’ [-Wunused-variable] { int r,co=a,cob=b; ^ user.cpp:5:14: warning: unused variable ‘cob’ [-Wunused-variable] { int r,co=a,cob=b; ^ user.cpp: In function ‘int main()’: user.cpp:24:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&a,&b); ^