Loop output slight error

[maureen22]

Hello I have a slight error in my code

int sum=0, lastValue, num=1;

cout <<"Enter a number for the last value: ";
cin >> lastValue;

do
{
cout <<num<<"+";
sum+=num;
num++;

}while( num<=lastValue );

cout << endl;
cout <<"Sum: "<<sum;

The output is this:
Enter a number for the last value: 20
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+
Sum: 210
And the problem is it adds the plus sign at the end of the last number.
What can I do so that the plus sign won't appear on the last number?

[Ganado]

Don't print out a plus sign before you know if there will be another number.

You can do while (num < lastValue) instead of (num <= lastValue), and then at the end, just cout << lastValue. And then just handle edge cases like if the user enters 0.

[maureen22]

It works but the last value won't be added to the sum,
the sum of the output is 190 instead of 210

[maureen22]

And I haven't heard of edge cases

[maureen22]

Ohh I figured it out, thanks for the help sir