How to use If...Else statement to compare struct's

[vead]

Hello everyone

I want to compare current date with Alarm dates which is in dd/MM/YYYY string format

This is the data structure that is used to store the current date

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Code C - [expand]
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typedef struct  {
    int day;
    int month;
    int year;
} Date ;

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This is the data structure that is used to store the Alarm date

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Code C - [expand]
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typedef struct  {
    int day;
    int month;
    int year;
} Alarm_Date ;

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Start function

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Code C - [expand]
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int main ()
 
{
 
}

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Current date : 01/10/2015

Alarm dates :02/10/2015, 04/10/2015, 06/10/2015

Compare current date with alarm date
If current date match with Alarm date 02/10/2015, than compare next Alarm date

If current date match with Alarm date 04/10/2015, than compare next Alarm date

If current date match with Alarm date 06/10/2015, than compare next Alarm date

How to use If...Else statement to compare current date with Alarm date ?

 

[Easyrider83]

Re: How to use If...Else statement to perform the comparison.

Structure is an array of bytes in memory. So, easiest way is to compare them like a string.

 

[ec_nisarg]

Re: How to use If...Else statement to perform the comparison.

your both typedef have same members so no need to define them twice..
rather....

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Code C - [expand]
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typedef struct
{
uint8_t day,
uint8_t month,
uint8_t year,
}_tdt;
 
_tdt Date,AlarmDate;

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- - - Updated - - -

there is a library function (if your compiler supports) memcmp...
search about it...

 

[betwixt]

Re: How to use If...Else statement to perform the comparison.

Use the 'strcmp(first string,second string)' command, it returns zero when the two strings are the same.

Brian.

 

[FvM]

Re: How to use If...Else statement to perform the comparison.

Use the 'strcmp(first string,second string)' command, it returns zero when the two strings are the same

I presume, the code author has a reason to use binary records rather than strings to represent the date information, I would also do so. In this case you can use memcmp() to compare the complete records.