Optional Values

[benjamin0]

I have a .csv file with data that looks like the following:

a,b,c
1,2,3
1,,3
1,2,3

I'd like to know that there's no b value for the second line (rather than interpreting it as 0). Is it possible to do this?

[ben-strasser]

Hi, does the following code work for you? int a, b, c; char*b_str; while(in.read_row(a,b_str,c)){ if(*b_str == '\0'){ // No b } else { b = atoi(b_str); // there is a b } } Best Regards Ben Strasser

…

On 07/11/2017 12:22 AM, Ben Segal wrote: I have a |.csv| file with data that looks like the following: |a,b,c 1,2,3 1,,3 1,2,3 | I'd like to know that there's no |b| value for the second line (rather than interpreting it as |0|). Is it possible to do this? — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#47>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ALaAj7AmzL663O_LoRGakYDmwkJpVpFaks5sMqQ-gaJpZM4OTflq>.

[DonaldTrump88]

I would like to know what will happen in case of 'b' value is not present.

1. Will the library throw error or issue just warning?
2. Is there any option to enable or disable these behaviours?

[ben-strasser]

As stated in the top comment: The default is interpret an empty field as zero value. If you want something else you must read a char* and do the parsing yourself.