C Programming Exercises, Practice, Solution : Date Time
C Date Time [10 exercises with solution]
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1. Write a program in C to print the current date and time.
Expected Output :
The Current date and time is : Thu Aug 03 13:38:58 2017
2. Write a program in C to compute the number of seconds passed since the beginning of the month.
Expected Output :
222084 seconds passed since the beginning of the month.
3. Write a program in C to convert a time_t object to a textual representation.
Expected Output :
Thu Aug 03 13:44:49 2017
4. Write a program in C to convert a tm object to a custom textual representation.
Expected 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
5. Write a program in C to convert a tm object to a custom wide string textual representation.
Expected Output :
The textual representation of specified date and time : Sunday 09/02/16 17:51:10 Sunday 09/02/16 17:51:10
6. Write a program in C to convert a time_t object to calendar time expressed as Coordinated Universal Time.
Expected Output :
The calendar time expressed as Coordinated Universal Time is : UTC: Thu Aug 03 10:53:03 2017 local: Thu Aug 03 16:23:03 2017
7. Write a program in C to convert a time_t object to calendar time expressed as local time.
Expected Output :
The calendar time expressed as a local Time is : UTC: Thu Aug 03 11:15:59 2017 local: Thu Aug 03 16:45:59 2017
8. Write a program in C to print the date and time before 24 months.
Expected Output :
Today is : Thu Aug 3 17:27:16 2017
(DST is not in effect)
24 months ago the date was : Mon Aug 3 17:27:16 2015
(DST was not in effect)
9. Write a program in C to show the first of calendar time.
Expected Output :
Sun Jan 01 00:00:00 1900
10. Write a program in C to show the start of the epoch.
Note : epoch means the beginning of a period in the history of someone.
Expected Output :
0 seconds since the epoch began Thu Jan 01 00:00:00 1970
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C Programming: Tips of the Day
Returning an array using C
You can't return arrays from functions in C. You also can't (shouldn't) do this:
char *returnArray(char array []){
char returned [10];
//methods to pull values from array, interpret them, and then create new array
return &(returned[0]); //is this correct?
}
returned is created with automatic storage duration and references to it will become invalid once it leaves its declaring scope, i.e., when the function returns.
You will need to dynamically allocate the memory inside of the function or fill a preallocated buffer provided by the caller.
Dynamically allocate the memory inside of the function (caller responsible for deallocating ret)
char *foo(int count) {
char *ret = malloc(count);
if(!ret)
return NULL;
for(int i = 0; i < count; ++i)
ret[i] = i;
return ret;
}
Call it like so:
int main() {
char *p = foo(10);
if(p) {
// do stuff with p
free(p);
}
return 0;
}
Ref : https://bit.ly/3yFIeao
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