I have a question and also i have a code..just wanna ask how could I insert the error code using Cpp

Question

//How could I insert the error message if the user would have
// enter a alphabet or special characters

#include <iostream>

using namespace std;

int main()
{
int evensum =0;
int oddsum =0;
int num=0;
char error;

for (int i = 1;i < 5; i++)
{
cout <<" Please enter a number: ";
cin >> num;

if (i% 2==0)
{
evensum = evensum+num;
}

else{
oddsum = oddsum+num;
}
else if{
cout << you enter an error<<endl;
}
}
cout <<"total of all the entered numbers is: " << evensum<< endl;
cout <<"total of all the entered numbers is: " << oddsum<< endl;
return 0;
}

Answer 1

You can use try/catch block
https://www.sololearn.com/learn/CPlusPlus/1918/

Answer 2

what do you want to happen if input is not a number
,....input until It is a number or exit out?

Answer 3

all i want to know is to give a message that error please enter a number