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Generally, we use header files in C/C++ languages to access the built-in functions like int, char, string functions. The function printf() is also a built-in function which is declared in “stdio.h” header file and it is used to print any kind of data on console.Here is an example to print without header files in C language, Exampleint printf(const char *text, ...); int main() { printf( "Hello World" ); return 0; }OutputHello WorldIn the above program, we printed “Hello World” without using any header file in the program by declaring the printf() function. The declaration of printf() is as ... Read More
For GregorianCalendar class, import the following package.import java.util.GregorianCalendar;Create an object.GregorianCalendar cal = (GregorianCalendar) GregorianCalendar.getInstance();Now, use the following field and add() method with a negative one (-1) to display the previous day.cal.add((GregorianCalendar.DATE), -1)Example Live Demoimport java.util.Calendar; import java.util.GregorianCalendar; public class Demo { public static void main(String[] a) { GregorianCalendar cal = (GregorianCalendar) GregorianCalendar.getInstance(); System.out.println("Current date: " + cal.getTime()); // past date cal.add((GregorianCalendar.DATE), -1); System.out.println("Modified date (Previous Day): " + cal.getTime()); } }OutputCurrent date: Mon Nov 19 18:12:53 UTC 2018 Modified date (Previous Day): Sun Nov ... Read More
The function strftime() is used to format the time and date as a string. It is declared in “time.h” header file in C language. It returns the total number of characters copied to the string, if string fits in less than size characters otherwise, returns zero.Here is the syntax of strftime() in C language, size_t strftime(char *string, size_t size, const char *format, const struct tm *time_pointer)Here, string − Pointer to the destination array.size − Maximum number of characters to be copied.format − Some special format specifiers to represent the time in tm.time_pointer − Pointer to tm structure that contains the ... Read More
To work with the GregorianCalendar class, import the following package −import java.util.GregorianCalendar;To get the day of week in month, use the following field −cal.get(Calendar.DAY_OF_WEEK_IN_MONTH)Above, cal is the GregorianCalendar object we created before −GregorianCalendar cal = new GregorianCalendar();The following is an example −Example Live Demoimport java.util.GregorianCalendar; import java.util.Calendar; import java.util.Date; public class Demo { public static void main(String[] args) { GregorianCalendar cal = new GregorianCalendar(); // date information System.out.println("Date Information.........."); System.out.println("Year = " + cal.get(Calendar.YEAR)); System.out.println("Month = " + (cal.get(Calendar.MONTH) + 1)); System.out.println("Date ... Read More
A static function in C is a function that has a scope that is limited to its object file. This means that the static function is only visible in its object file. A function can be declared as static function by placing the static keyword before the function name.An example that demonstrates this is given as follows −There are two files first_file.c and second_file.c. The contents of these files are given as follows −Contents of first_file.cstatic void staticFunc(void) { printf("Inside the static function staticFunc() "); }Contents of second_file.cint main() { staticFunc(); return 0; }Now, if the above ... Read More
To display weekday names in Java, use the getWeekdays() method.For that, firstly import the following package.import java.text.DateFormatSymbols;Now, create a string array and get all the weekday names using the getWeekdays() method.String[] weekDays = new DateFormatSymbols().getWeekdays();Example Live Demoimport java.text.DateFormatSymbols; public class Demo { public static void main(String[] args) { String[] weekDays = new DateFormatSymbols().getWeekdays(); System.out.println("Weekday names..."); for(String days: weekDays){ System.out.println(days); } } }OutputWeekday names... Sunday Monday Tuesday Wednesday Thursday Friday Saturday
To format a date in Java, firstly import the following package.import java.text.DateFormat;Now, create DateFormat object.DateFormat shortFormat = DateFormat.getDateInstance(DateFormat.SHORT); DateFormat longFormat = DateFormat.getDateInstance(DateFormat.LONG);Use the format() method to format the above dates.System.out.println(shortFormat.format(new Date())); System.out.println(longFormat.format(new Date()));To parse the dates, use the parse() method.Example Live Demoimport java.text.DateFormat; import java.text.ParseException; import java.util.Date; public class Demo { public static void main(String[] args) throws Exception { // format date DateFormat shortFormat = DateFormat.getDateInstance(DateFormat.SHORT); DateFormat longFormat = DateFormat.getDateInstance(DateFormat.LONG); System.out.println("Format Date..."); System.out.println(shortFormat.format(new Date())); System.out.println(longFormat.format(new Date())); // parse date ... Read More
The function pow() is used to calculate the power raised to the base value. It takes two arguments. It returns the power raised to the base value. It is declared in “math.h” header file.Here is the syntax of pow() in C language, double pow(double val1, double val2);Here, val1 − The base value whose power is to be calculated.val2 − The power value.Here is an example of pow() in C language, Example#include #include int main() { double x = 5.5; double y = 4.0; double p; p = pow(x, y); printf("The value : %lf", p); ... Read More
When static keyword is used, variable or data members or functions can not be modified again. It is allocated for the lifetime of program. Static functions can be called directly by using class name.Static variables are initialized only once. Compiler persist the variable till the end of the program. Static variable can be defined inside or outside the function. They are local to the block. The default value of static variable is zero. The static variables are alive till the execution of the program.Here is the syntax of static variables in C language, static datatype variable_name;Here, datatype − The datatype ... Read More
Details about getchar(), fgetc() and getc() functions in C programming are given as follows −The getchar() functionThe getchar() function obtains a character from stdin. It returns the character that was read in the form of an integer or EOF if an error occurs.A program that demonstrates this is as follows −Example Live Demo#include int main (){ int i; printf("Enter a character: "); i = getchar(); printf("The character entered is: "); putchar(i); return(0); }OutputThe output of the above program is as follows −Enter a character: G The character entered is: GNow ... Read More