C Questions and Answers – Date and Time Function – 3

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Date and Time Function – 3”.

Pre-requisite for this C MCQ set: Advanced C Programming Video Tutorial.

1. What will be the output of the following C code, if the system date is 6/23/2017?

#include<stdio.h>
#include<time.h>
int main()
{
    struct tm *local;
    time_t t;
    t=time(NULL);
    local=localtime(&t);
    printf("%d",local->tm_mday);
    return 0;
}

a) 6
b) 22
c) 23
d) error
View Answer

2. What will be the output of the following C code, if the system date is 6/24/2017?

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
int main()
{
    time_t ct;
    time(&ct);
    printf("%s\n",(&ct));
}

a) Error
b) Junk value
c) 6
d) June
View Answer

3. What is the meaning of the following C code if output is 0?

#include<stdio.h>
#include<time.h>
int main()
{
    struct tm *local;
    time_t t;
    t=time(NULL);
    local=localtime(&t);
    printf("%d",local->tm_isdst);
    return 0;
}

a) DST is in effect
b) DST status is unknown
c) DST is not in effect
d) DST is corresponding with local time
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4. The following C code results in an error. State whether true or false.

#include<stdio.h>
#include<time.h>
int main()
{
    struct tm *local;
    time_t t;
    t=time(NULL);
    local=asctime(localtime(&t));
    printf("%d",local->tm_wday);
    return 0;
}

a) True
b) False
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5. Which of the following format specifiers is used to specify whether the given time is in AM or PM?
a) %P
b) %I
c) %X
d) %p
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6. What will be the output of the following C code if the system time is 1:52 PM (Sunday)?

#include<stdio.h>
#include<time.h>
int main()
{
    struct tm *ptr;
    time_t t;
    char str[100];
    t = time(NULL);
    ptr = localtime(&t);
    strftime(str,100,"%I",ptr);
    puts(str);
    return 0;
}

a) 13
b) 01
c) 1
d) error
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7. Which of the following format specifiers is used to represent the hours in the 24 hour clock (0-23) format?
a) %I
b) %H
c) %i
d) %h
View Answer

8. What will be the output of the following C code?

#include <stdio.h>
#include <time.h>
int main ()
{
	double d;
	d = difftime (5,17);
	printf ("%.2f\n", d );
	return 0;
}

a) 12.00
b) -12.00
c) Error
d) 12
View Answer

9. The value returned by the library function mktime(), on failure is _________
a) -1
b) 0
c) 1
d) -2
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10. Which of the following is defined under the header file time.h?
a) strnct()
b) fabs()
c) iscntrl()
d) null
View Answer

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