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Programming Articles
Page 1549 of 2547
frexp() in C++
The function frexp() is used to break the floating point number into its binary significand and integral exponent for 2. It returns the binary significand and its range is (0.5, 1). If we pass value zero, its significand and exponent value will be zero.Here is the mathematical expression of frexp(), x = significand * (2^exponent)Here is the syntax of frexp() in C++ language, float frexp(float variable_name, int* exponent);Here, variable_name − Any name of variable which has floating number to be decomposed into binary significant.exponent − It is a pointer to int where value of exponent is stored.Here is an example ...
Read MoreAccess to the Group Database in Python
To access the UNIX group database, we should use the grp module. The shadow password database entries are like tuple like object.To use the grp module, we should import it using −import grpThe attributes of the grp database are −IndexAttribute & Description0gr_nameThe Name of the groups1gr_passwdThe Encrypted password for the group. (Generally empty)2gr_gidThe group id (Numeric)3gr_memA list of group usersIn the group object, the gid is an integer. The group name and the password are strings. The Member list is a list of strings.Some methods of this module are −Method grp.getgrgid(gid)This method will return group database entry from the given ...
Read MoreGet byte array from BigInteger in Java
First, set the BigInteger object with binary.BigInteger val = new BigInteger("100000000110001100000", 2);Now, use the toByteArray() method.byte[] byteArr = val.toByteArray();The following is an example −Exampleimport java.math.BigInteger; public class Demo { public static void main(String[] argv) throws Exception { BigInteger val = new BigInteger("100000000110001100000", 2); byte[] byteArr = val.toByteArray(); for (int i = 0; i < byteArr.length; i++) { System.out.format("0x%02X", byteArr[i]); } } }Output0x10 0x0C 0x60
Read Morelog1p() in C++
The function log1p() is used to calculate the natural logarithm (base e logarithm) of (a+1) where a is any number. It returns the value of natural logarithm of (a+1). It returns Not a number(Nan) when we pass a value which is less than -1.Here is the mathematical expression of log1p(), log1p(a) = base-e log(a+1)Here is the syntax of log1p() in C++ language, float log1p(float variable_name);Here, variable_name − Any name given to the variable whose logarithmic value is calculated.Here is an example of log1p() in C++ language, Example#include #include using namespace std; int main() { int x ...
Read MoreJava Program to return a Date set to the last possible millisecond of the day before midnight
Let us first set the calendar object.Calendar calendar = Calendar.getInstance();Use the getMaximum() method in Java to returns the maximum value for the given calendar field. We will use it to set the minute, hours second and milliseconds.For hour and minute.calendar.set(Calendar.HOUR_OF_DAY, calendar.getMaximum(Calendar.HOUR_OF_DAY)); calendar.set(Calendar.MINUTE, calendar.getMaximum(Calendar.MINUTE));For second and milliseconds.// second calendar.set(Calendar.SECOND, calendar.getMaximum(Calendar.SECOND)); // millisecond calendar.set(Calendar.MILLISECOND, calendar.getMaximum(Calendar.MILLISECOND));The following is an example that returns a Date set to the last possible millisecond of the day before midnight.Exampleimport java.util.Calendar; import java.util.GregorianCalendar; public class Demo { public static void main(String[] argv) throws Exception { Calendar calendar = Calendar.getInstance(); // hour ...
Read MoreBigInteger.isProbablePrime() method in Java
TheBigInteger.isProbablePrime(int certainty) returns true if this BigInteger is probably prime, false if it's definitely composite. If certainty is ≤ 0, true is returned.Here, the “certainty” parameter is a measure of the uncertainty that the caller is willing to tolerate: if the call returns true the probability that this BigInteger is prime exceeds (1 - 1/2certainty). The execution time of this method is proportional to the value of this parameter.The following is an example −Exampleimport java.math.BigInteger; public class Demo { public static void main(String[] argv) throws Exception { // create 3 BigInteger ...
Read Moreexpm1() in C++
The function expm1() is used to calculate the exponential raised to the power of any number minus one. It returns the value of (exponential raised to the power of a) - 1.Here is the mathematical expression of expm1(),expm1(a) = (e^a) - 1Here is the syntax of expm1() in C++ language,float expm1(variable_name);Here,variable_name − Any name given to the variable whose value is calculated.Here is an example of expm1() in C++ language,Example#include #include using namespace std; int main() { int x = 10; float y = 8.28; cout
Read MoreJava Program to return a Date set to the first possible millisecond of the day after midnight
Let us first set the calendar object.Calendar calendar = Calendar.getInstance();Use the getMinimum() method in Java to return the minimum value for the given calendar field. We will use it to set the minute, hours second and milliseconds.For hour and minute.calendar.set(Calendar.HOUR_OF_DAY, calendar.getMinimum(Calendar.HOUR_OF_DAY)); calendar.set(Calendar.MINUTE, calendar.getMinimum(Calendar.MINUTE));For second and milliseconds.// second calendar.set(Calendar.SECOND, calendar.getMinimum(Calendar.SECOND)); // millisecond calendar.set(Calendar.MILLISECOND, calendar.getMinimum(Calendar.MILLISECOND));The following is an example that returns a Date set to the first possible millisecond of the day after midnight.Exampleimport java.util.Calendar; import java.util.GregorianCalendar; public class Demo { public static void main(String[] argv) throws Exception { Calendar calendar = Calendar.getInstance(); // hour ...
Read MoreLine Separator in Java
Strings have no newlines. We can form them into two lines by concatenating a newline string. Use System lineSeparator to get a platform-dependent newline string.The following is an example.Examplepublic class Demo { public static void main(String[] args) { String str = "one" + System.lineSeparator() + "two"; System.out.println(str); } }Outputone twoLet us see another example. On Linux based system, the program will work correctly.Examplepublic class Demo { public static void main(String[] args) { String str = System.lineSeparator(); System.out.println((int) str.charAt(0)); } }Output10
Read Moreremquo() in C++
The function remquo() is used to calculate the floating point remainder of numerator or denominator and stores the quotient to the passed pointer. It returns Nan(Not a number) when denominator is zero.Here is the syntax of remquo() in C++ language, float remquo(float var1, float var2, int* var3);Here, var1 − The variable which stores the value of numerator.var2 − The variable which stores the value of denominator.var3 − The pointer variable which stores the quotient.Here is an example of remquo() in C++ language, Example#include #include using namespace std; int main() { float x = 28.8; ...
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