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C Exercises: Convert a tm object to custom textual representation

C Date Time: Exercise-4 with Solution

Write a program in C to convert a tm object to custom textual representation.

Sample Solution:

C Code:

#include <stdio.h> 
#include <time.h>
#include <locale.h>
 
int main(void)
{
    char time_buff[70];
    struct tm mytime = { .tm_year=116, // = year 2016
                          .tm_mon=8,    // = 9th month
                          .tm_mday=2,   // = 2nd day
                          .tm_hour=16,   // = 16 hours
                          .tm_min=30,   // = 30 minutes
                          .tm_sec=32    // = 32 secs
    };
    printf("\n The textual representation of specified date and time :\n"); 
    if (strftime(time_buff, sizeof time_buff, "%B %c %P" , &mytime)) 
    {
        puts(time_buff);
    } else {
        puts("strftime failed");
    }
    setlocale(LC_TIME, "el_GR.utf8");
 
    if (strftime(time_buff, sizeof time_buff, "%B %c %P", &mytime)) {
        puts(time_buff);
    } else {
        puts("strftime failed");
    }
    printf("\n");     
}

Sample Output: 

 The textual representation of specified date and time :                                                                      
September Sun Sep  2 16:30:32 2016 pm                                                                                         
September Sun Sep  2 16:30:32 2016 pm

Flowchart:

Flowchart: Convert a tm object to custom textual representation

C Programming Code Editor:

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C Programming: Tips of the Day

Static variable inside of a function in C

The scope of variable is where the variable name can be seen. Here, x is visible only inside function foo().

The lifetime of a variable is the period over which it exists. If x were defined without the keyword static, the lifetime would be from the entry into foo() to the return from foo(); so it would be re-initialized to 5 on every call.

The keyword static acts to extend the lifetime of a variable to the lifetime of the programme; e.g. initialization occurs once and once only and then the variable retains its value - whatever it has come to be - over all future calls to foo().

Ref : https://bit.ly/3fOq7XP