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Help with removing an element of a string :(
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Hey guys.
This is really frustrating because it seems easy but I can't seem to find the correct function to remove this element of my string.
At the moment it will output something similar to this:
{1,2,3,} --> notice the , after the last digit?
It needs to be this:
{1,2,3} --> no ',' after the last digit.
Any help would be appreciated,
Regards.
This is really frustrating because it seems easy but I can't seem to find the correct function to remove this element of my string.
C++ Syntax (Toggle Plain Text)
At the moment it will output something similar to this:
{1,2,3,} --> notice the , after the last digit?
It needs to be this:
{1,2,3} --> no ',' after the last digit.
Any help would be appreciated,
Regards.
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#2 Oct 11th, 2009
Well at the end can't you just do an string erase on the last but one element?
string p = "{1,2,3,24,}";
p.erase(p.length()-2,1);
string p = "{1,2,3,24,}";
p.erase(p.length()-2,1);
Last edited by iamthwee; Oct 11th, 2009 at 9:31 am.
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#3 Oct 11th, 2009
That's true, but how will I be able to declare string p? Because there is a for loop present.. so it would have to store the output as a string somehow which I'm not too sure how to go about 
EDIT: The display() function is different every time because setlist is having elements added to it.. so the digits between the brackets will always be different.
EDIT: The display() function is different every time because setlist is having elements added to it.. so the digits between the brackets will always be different.
Last edited by scantraXx-; Oct 11th, 2009 at 9:40 am.
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#4 Oct 11th, 2009
I think your easiest answer would be
vector<int>setlist;
setlist.push_back(3);
setlist.push_back(12);
setlist.push_back(4);
string s1 = ",";
cout << "{";
for (int i = 0; i < setlist.size(); i++)
{
cout << setlist[i];
if (i!=setlist.size()-1)
{
cout << s1;
}
}
cout << "}";
cin.get();
vector<int>setlist;
setlist.push_back(3);
setlist.push_back(12);
setlist.push_back(4);
string s1 = ",";
cout << "{";
for (int i = 0; i < setlist.size(); i++)
{
cout << setlist[i];
if (i!=setlist.size()-1)
{
cout << s1;
}
}
cout << "}";
cin.get();
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#5 Oct 11th, 2009
oops i meant
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1.
vector<bool>setlist;
2.
setlist.push_back(true);
3.
setlist.push_back(false);
4.
setlist.push_back(true);
5.
setlist.push_back(true);
6.
7.
int i
8.
string s1 = ",";
9.
cout << "{";
10.
for (i = 0; i < setlist.size(); i++)
11.
{
12.
13.
if (setlist.at(i) == true)
14.
{
15.
cout << i;
16.
17.
}
18.
19.
if (i!=setlist.size()-1)
20.
{
21.
22.
cout << s1;
23.
}
24.
}
25.
i--;
cout << "}";
26.
27.
cin.get();
vector<bool>setlist;
2.
setlist.push_back(true);
3.
setlist.push_back(false);
4.
setlist.push_back(true);
5.
setlist.push_back(true);
6.
7.
int i
8.
string s1 = ",";
9.
cout << "{";
10.
for (i = 0; i < setlist.size(); i++)
11.
{
12.
13.
if (setlist.at(i) == true)
14.
{
15.
cout << i;
16.
17.
}
18.
19.
if (i!=setlist.size()-1)
20.
{
21.
22.
cout << s1;
23.
}
24.
}
25.
i--;
cout << "}";
26.
27.
cin.get();
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#7 Oct 11th, 2009
I'd switch the order of printing around. First print a comma, then print the number.
This does require you to find the first number beforehand, though.
This does require you to find the first number beforehand, though.
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Last edited by BeyondTheEye; Oct 11th, 2009 at 4:16 pm.
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#8 Oct 11th, 2009
Easy way out, just put a condition to check if "i" is at .size() - 1;
if not then print or else not print.
if not then print or else not print.
I give up! 1) What word becomes shorter if you add a letter to it? [ Solved by : niek_e ] 2) What does this sequence equal to : (.5u - .5a)(.5u-.5b)(.5u-.5c) ... 3) What is the 123456789 prime numer? Ask4Answer
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#9 Oct 11th, 2009
1. void set::display() const
2. // pre : none
3. // post : displays the elements of this set enclosed in braces and
4. // separated by commas eg {1,2,3} or {} (do not use backspace, delete etc)
5. {
6. string s1 = "";
7. cout << "{";
8. for (int i = 0; i < setlist.size(); i++, s1 = ",")
9. {
10. if (setlist.at(i) == true)
11. {
12. cout << s1;
13. cout << i;
14. }
15. }
16. cout << "}";
17. }
2. // pre : none
3. // post : displays the elements of this set enclosed in braces and
4. // separated by commas eg {1,2,3} or {} (do not use backspace, delete etc)
5. {
6. string s1 = "";
7. cout << "{";
8. for (int i = 0; i < setlist.size(); i++, s1 = ",")
9. {
10. if (setlist.at(i) == true)
11. {
12. cout << s1;
13. cout << i;
14. }
15. }
16. cout << "}";
17. }
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