Question

how would i write this into at least one function using what i have already

Answer 1

#include<iostream>
using namespace std;
int main()
{
int original, temp1, temp2, sum, remainder;
int first, second, third, fourth;
cout<<"enter an 8 digit number"<<endl;
cin>>original;
temp1=original/100;
first=original%100;
temp2=temp1/100;
second=temp1%100;
fourth=temp2/100;
third=temp2%100;
sum=first+second+third+fourth;
remainder=sum%26;
cout<<"the first number is "<<first<<endl;
cout<<"the second number is "<<second<<endl;
cout<<"the third number is "<<third<<endl;
cout<<"the fourth number is "<<fourth<<endl;
cout<<"when the numbers are added it is "<<sum<<endl;
cout<<"the remandier is "<<remainder<<endl;
cout<<"adding character is : "<<(char)(remainder+65);
return 0;

}

Answer 2

Functions are great for repetitive tasks, take any one of the steps you are repeating and turn it into a function. For example,
int get_six(int x){
return x/100;
}
temp1= get_six(original);
temp2=get_six(temp1);

Answer 3

Another metric for creating functions, is after you comment your code, if you read down through it, you see "paragraphs" or "stanzas" of code, they'd be candidates for a function.