Main.cc: In function 'int main()':
Main.cc:6:9: error: conflicting declaration 'double c'
double c=(a+b+c)/3;
^
Main.cc:4:10: note: previous declaration as 'int c'
int a,b,c;
^
Main.cc:7:17: warning: format '%f' expects argument of type 'double', but argument 2 has type 'int' [-Wformat=]
printf("%.2f",c);
^