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Taking the months out of a string that is within a vector of pairs

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1

I have a vector pair of dates and payments that looks like this:

std::vector<std::pair<std::string, double>> payments = "8/18", 0.0, "7/18", 771.98, "6/18", 0.0, "5/18", 771.98,
 "4/18", 771.98, "3/18", 771.98, "2/18", 0.0, "1/18", 3859.90,
 "12/17", 771.98, "11/17", 0.0, "10/17", 1543.96, "9/17", 771.98 ;

I want to take the months out of each first element and put it into a vector of ints i.e.

 payment_months = [8,7,6,5,4,3,2,1,12,11,10,9]

I tried doing this:

std::vector<int> paymentMonths;
for (auto it : payments)

 paymentMonths.push_back(it.first[0] - '0');

This gives me

8 7 6 5 4 3 2 1 1 1 1 9

So the problem is when I get to the the months of December, November, and October. Does anyone know how to fix this?

c++ vector std-pair

share|improve this question

edited Mar 7 at 21:53

Brian Tompsett - 汤莱恩

4,2421339102

asked Nov 19 '18 at 18:43

SnorrlaxxxSnorrlaxxx

13611

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Can you be more specific about your problem please. Post a Minimal, Complete, and Verifiable example that reproduces the problem you're stuck with as required here.
  
  – πάντα ῥεῖ
  Nov 19 '18 at 18:46
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @πάνταῥεῖ Edited with an example
  
  – Snorrlaxxx
  Nov 19 '18 at 18:48
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Why are you storing dates as a string rather than a Date/Time class that can deal with all the nitty-gritty of time?
  
  – Jesper Juhl
  Nov 19 '18 at 18:51
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Break the problem down. The issue is not with vector, as you already are getting the string correctly. The issue is one of taking a string delimited by a slash and getting the first token.
  
  – PaulMcKenzie
  Nov 19 '18 at 18:52
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Why not using a map to get a month-int from a month-string ?
  
  – Damien
  Nov 19 '18 at 18:53
  

  
  
  
  

add a comment | 

1

I have a vector pair of dates and payments that looks like this:

std::vector<std::pair<std::string, double>> payments = "8/18", 0.0, "7/18", 771.98, "6/18", 0.0, "5/18", 771.98,
 "4/18", 771.98, "3/18", 771.98, "2/18", 0.0, "1/18", 3859.90,
 "12/17", 771.98, "11/17", 0.0, "10/17", 1543.96, "9/17", 771.98 ;

I want to take the months out of each first element and put it into a vector of ints i.e.

 payment_months = [8,7,6,5,4,3,2,1,12,11,10,9]

I tried doing this:

std::vector<int> paymentMonths;
for (auto it : payments)

 paymentMonths.push_back(it.first[0] - '0');

This gives me

8 7 6 5 4 3 2 1 1 1 1 9

So the problem is when I get to the the months of December, November, and October. Does anyone know how to fix this?

c++ vector std-pair

share|improve this question

edited Mar 7 at 21:53

Brian Tompsett - 汤莱恩

4,2421339102

asked Nov 19 '18 at 18:43

SnorrlaxxxSnorrlaxxx

13611

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Can you be more specific about your problem please. Post a Minimal, Complete, and Verifiable example that reproduces the problem you're stuck with as required here.
  
  – πάντα ῥεῖ
  Nov 19 '18 at 18:46
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @πάνταῥεῖ Edited with an example
  
  – Snorrlaxxx
  Nov 19 '18 at 18:48
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Why are you storing dates as a string rather than a Date/Time class that can deal with all the nitty-gritty of time?
  
  – Jesper Juhl
  Nov 19 '18 at 18:51
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Break the problem down. The issue is not with vector, as you already are getting the string correctly. The issue is one of taking a string delimited by a slash and getting the first token.
  
  – PaulMcKenzie
  Nov 19 '18 at 18:52
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Why not using a map to get a month-int from a month-string ?
  
  – Damien
  Nov 19 '18 at 18:53
  

  
  
  
  

add a comment | 

I have a vector pair of dates and payments that looks like this:

std::vector<std::pair<std::string, double>> payments = "8/18", 0.0, "7/18", 771.98, "6/18", 0.0, "5/18", 771.98,
 "4/18", 771.98, "3/18", 771.98, "2/18", 0.0, "1/18", 3859.90,
 "12/17", 771.98, "11/17", 0.0, "10/17", 1543.96, "9/17", 771.98 ;

I want to take the months out of each first element and put it into a vector of ints i.e.

 payment_months = [8,7,6,5,4,3,2,1,12,11,10,9]

I tried doing this:

std::vector<int> paymentMonths;
for (auto it : payments)

 paymentMonths.push_back(it.first[0] - '0');

This gives me

8 7 6 5 4 3 2 1 1 1 1 9

So the problem is when I get to the the months of December, November, and October. Does anyone know how to fix this?

c++ vector std-pair

share|improve this question

edited Mar 7 at 21:53

Brian Tompsett - 汤莱恩

4,2421339102

asked Nov 19 '18 at 18:43

SnorrlaxxxSnorrlaxxx

13611

std::vector<std::pair<std::string, double>> payments = "8/18", 0.0, "7/18", 771.98, "6/18", 0.0, "5/18", 771.98,
 "4/18", 771.98, "3/18", 771.98, "2/18", 0.0, "1/18", 3859.90,
 "12/17", 771.98, "11/17", 0.0, "10/17", 1543.96, "9/17", 771.98 ;

 payment_months = [8,7,6,5,4,3,2,1,12,11,10,9]

std::vector<int> paymentMonths;
for (auto it : payments)

 paymentMonths.push_back(it.first[0] - '0');

8 7 6 5 4 3 2 1 1 1 1 9

share|improve this question

edited Mar 7 at 21:53

Brian Tompsett - 汤莱恩

4,2421339102

asked Nov 19 '18 at 18:43

SnorrlaxxxSnorrlaxxx

13611

share|improve this question

edited Mar 7 at 21:53

Brian Tompsett - 汤莱恩

4,2421339102

asked Nov 19 '18 at 18:43

SnorrlaxxxSnorrlaxxx

13611

edited Mar 7 at 21:53

Brian Tompsett - 汤莱恩

4,2421339102

edited Mar 7 at 21:53

Brian Tompsett - 汤莱恩

4,2421339102

asked Nov 19 '18 at 18:43

SnorrlaxxxSnorrlaxxx

13611

asked Nov 19 '18 at 18:43

SnorrlaxxxSnorrlaxxx

13611

1 Answer
1

active

oldest

votes

2

Because some of your months have more than one digit representing them what you need to do is get the sub string of the date string that just has the month part, and then you can convert that to a integer using stoi. That would make you loo look like

std::vector<int> paymentMonths;
for (auto it : payments)

 paymentMonths.push_back(std::stoi(it.first.substr(0, it.first.find("/"))));

share|improve this answer

answered Nov 19 '18 at 18:49

NathanOliverNathanOliver

95.8k16135208

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Very nice thank you
  
  – Snorrlaxxx
  Nov 19 '18 at 18:50
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @Snorrlaxxx Your welcome. Do note that I did not include error checking in this. If your strings might not be in the form of "xx/yy" then this could cause an issue.
  
  – NathanOliver
  Nov 19 '18 at 18:56
  
  

  
  
  
  

add a comment | 

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2

Because some of your months have more than one digit representing them what you need to do is get the sub string of the date string that just has the month part, and then you can convert that to a integer using stoi. That would make you loo look like

std::vector<int> paymentMonths;
for (auto it : payments)

 paymentMonths.push_back(std::stoi(it.first.substr(0, it.first.find("/"))));

share|improve this answer

answered Nov 19 '18 at 18:49

NathanOliverNathanOliver

95.8k16135208

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Very nice thank you
  
  – Snorrlaxxx
  Nov 19 '18 at 18:50
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @Snorrlaxxx Your welcome. Do note that I did not include error checking in this. If your strings might not be in the form of "xx/yy" then this could cause an issue.
  
  – NathanOliver
  Nov 19 '18 at 18:56
  
  

  
  
  
  

add a comment | 

2

Because some of your months have more than one digit representing them what you need to do is get the sub string of the date string that just has the month part, and then you can convert that to a integer using stoi. That would make you loo look like

std::vector<int> paymentMonths;
for (auto it : payments)

 paymentMonths.push_back(std::stoi(it.first.substr(0, it.first.find("/"))));

share|improve this answer

answered Nov 19 '18 at 18:49

NathanOliverNathanOliver

95.8k16135208

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Very nice thank you
  
  – Snorrlaxxx
  Nov 19 '18 at 18:50
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @Snorrlaxxx Your welcome. Do note that I did not include error checking in this. If your strings might not be in the form of "xx/yy" then this could cause an issue.
  
  – NathanOliver
  Nov 19 '18 at 18:56
  
  

  
  
  
  

add a comment | 

Because some of your months have more than one digit representing them what you need to do is get the sub string of the date string that just has the month part, and then you can convert that to a integer using stoi. That would make you loo look like

std::vector<int> paymentMonths;
for (auto it : payments)

 paymentMonths.push_back(std::stoi(it.first.substr(0, it.first.find("/"))));

share|improve this answer

answered Nov 19 '18 at 18:49

NathanOliverNathanOliver

95.8k16135208

std::vector<int> paymentMonths;
for (auto it : payments)

 paymentMonths.push_back(std::stoi(it.first.substr(0, it.first.find("/"))));

share|improve this answer

answered Nov 19 '18 at 18:49

NathanOliverNathanOliver

95.8k16135208

answered Nov 19 '18 at 18:49

NathanOliverNathanOliver

95.8k16135208

answered Nov 19 '18 at 18:49

NathanOliverNathanOliver

95.8k16135208