Programming in C
4th Edition
ISBN: 9780321776419
Author: Stephen G. Kochan
Publisher: Addison-Wesley
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Chapter 8, Problem 2E
In certain applications, particularly in the financial area, it is often necessary to calculate the number of elapsed days between two dates. For example, the number of days between July 2, 2015, and July 16, 2015, is obviously 14. But how many days are there between August 8. 2014, and February 22, 2015? This calculation requires a bit more thought.
Luckily, a formula can be used to calculate the number of days between two dates. This is affected by computing the value of .N for each of the two dates and then taking the difference, where N is calculated as follows:
N
where:
f if month <= 2
otherwise
g if month <= 2
otherwise
As an example of applying the formula, to calculate the number of days between August 8, 2004, and February 22, 2005, you can calculate the values of N1 and N2 by substituting the appropriate values into the preceding formula as shown:
N1
N2
Number of elapsed days = N2 – N1
= 732,441 – 732,239
= 202
So the number of days between the two dates is shown to be 202. The preceding formula is applicable for any dates after March 1, 1900 (1 must be added to N for dates from March 1, 1800, to February 28, 1900,and 2 must be added for dates between March 1, 1700, and February 28, 1800).
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Chapter 8 Solutions
Programming in C
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