Why it is not executing ??

Question

what's wrong here
#include <iostream>
using namespace std;
class series
{
int n,i,sum;
public:
int read();
int compute();
int display();
};
int read()
{
std::cout<<"Enter the value of n:";
cin>>n;
}
int compute()
{
for (i=1,sum=0;i<=n;i++)
{
sum = sum+ i*i;
}
int display();
{
std:: cout<<"value of the series:"<<sum;
}

};
int main()
{
series s
s.read();
s.compute();
s.display();
return(0);
}

Answer 1

to declare the bodies of class members, you either declare them in the class itself, or write the function name as "class_name::method_name".

eg - instead of writing int read() when you write the body of the method outside the class, write it as
int series::read(){
// method body
}

Answer 2

Dear Ashish,

Since you are defining member functions outside the class body, make following corrections in your code and it will work

sing namespace std;
class series{

int n,i,sum;
public:
int read();
int compute();
int display();
};

int series :: read(){
std::cout<<"Enter the value of n:";
cin>>n;
}

int series :: compute(){

for (i=1,sum=0;i<=n;i++){
sum = sum+ i*i;
}

int series :: display(){
cout<<"value of the series:"<<sum;
}

Answer 3

write
int series::read ()
int series::compute()
int series::display ()

use classifier if you are defining function outside of class else if you want to write like this then define functions inside class itself.