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C question about 0s

post #1 of 18
Thread Starter 
Ok, i have a program right now im working on and its a grader using strings,arrays,and conditional logic. Im trying to scan in the IDs of the students but every time i scan in a ID into an array. with a 0 as first number(i.e. 0990). The first 0 disappears.
I tried using a for loop with a counter and a nested if function like this below

Quote:
for(z=0;z<j;z++)
{
if(nameid[z]<1000)
{

}
}

but i don't know what would i be using to get it to add an extra '0' in front of the id. Any help guys?
post #2 of 18
001234 is no different than 1234 if you store it in an integer or float. How are you storing the number? What type is your array? (e.g. char[], int[]?)
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post #3 of 18
Quote:
Originally Posted by Hokin View Post
Ok, i have a program right now im working on and its a grader using strings,arrays,and conditional logic. Im trying to scan in the IDs of the students but every time i scan in a ID into an array. with a 0 as first number(i.e. 0990). The first 0 disappears.
Are the preceeding zeros required?
If yes, then you actually don't have a number but have a string comprised of numbers.
If no, then why does it matter?
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post #4 of 18
Thread Starter 
Quote:
Originally Posted by lordikon View Post
001234 is no different than 1234 if you store it in an integer or float. How are you storing the number? What type is your array? (e.g. char[], int[]?)
Im using an int array to store the number.
post #5 of 18
Thread Starter 
Quote:
Originally Posted by DuckieHo View Post
Are the preceeding zeros required?
If yes, then you actually don't have a number but have a string comprised of numbers.
If no, then why does it matter?
Yes, i do need the preceding number since its the student id which has to match exacting from the input file.
No im not using a string to store number but just an array.
My array is "int nameid[100];"


Sorry for double post.
post #6 of 18
Quote:
Originally Posted by Hokin View Post
Yes, i do need the preceding number since its the student id which has to match exacting from the input file.


Sorry for double post.
You are attempting to compare two different types of variables. String != Integer.

You need to either:
1) Convert the input file ID strings to integers.
2) Create/Convert program generated IDs to string

Quote:
Originally Posted by Hokin View Post
No im not using a string to store number but just an array.
This statement is ambiguous.

Array is a construct of a variable type. You can have an array of strings or an array of integers.
Edited by DuckieHo - 5/9/11 at 12:17pm
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post #7 of 18
If you're storing the IDs in the array as ints, those zeros lost. You will need to store the IDs as a string like DuckieHo said.
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post #8 of 18
Thread Starter 
I the only way for me to get the preceding 0 is to scan the id as a string and not a int. correct?
post #9 of 18
Quote:
Originally Posted by Hokin View Post
I the only way for me to get the preceding 0 is to scan the id as a string and not a int. correct?

If all IDs will always be numbers.... you are better off performance-wise converting the input values to integer. It is faster to compare integers than strings.
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post #10 of 18
Quote:
Originally Posted by Hokin View Post
I the only way for me to get the preceding 0 is to scan the id as a string and not a int. correct?
Yes, you'll need a string, or if you're using C instead of C++, you'll need a char[]
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