C++ help!!!!!!!!!!!!!!!!!!!!!!!!!!...

Q1 write a program to enter the radius of a circle and display the area. use constant pi=3.14





Q2write a program to enter 3 numbers and dispaly the largest





Q3


write a program to enter the roll no. , name %26amp;marks in 3 subjects





Please help me

C++ help!!!!!!!!!!!!!!!!!!!!!!!!!!...
#include%26lt;iostream%26gt;


using namespace std;


int main()


{


double r,A;


cout%26lt;%26lt;"enter the radius\n"


cin%26gt;%26gt;r;


A=2*(3.14)(r);


cout%26lt;%26lt;A;


return 0;


}





q2:


#include%26lt;iostream%26gt;


using namespace std;


int main()


{


cin%26gt;%26gt;a;


cin%26gt;%26gt;b;


cin%26gt;%26gt;c;


if (a%26gt;b %26amp;%26amp; a%26gt;c)


cout%26lt;%26lt;"a isthe largest \n ";


else if(b%26gt;a %26amp;%26amp; b%26gt;c)


cout%26lt;%26lt;"b is the largest\n";


else


cout%26lt;%26lt;"c is the largest";


return 0;


}

wedding