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The full form of OpenCv is Open Source Computer Vision, using this library we can perform different operations on images, videos.Application areas of OpenCVFacial recognition systemMotion trackingArtificial neural networkDeep neural networkVideo streaming etc.For installing on Windows we can use this command linepip install opencv-pythonFor Linux −sudo apt-get install python-opencvTo complete our task we have to follow some steps −Step 1: We import OpenCv library named cv2. Step 2: Take a video as input data. Step 3: First we break the video into a number of frames and store all these frames in a list. Step 4: When we are getting ... Read More
To compute the elapsed time of an operation in Java, we use the System.currentTimeMillis() method. The java.lang.System.currentTimeMillis() returns the current time in milliseconds.Declaration −The java.lang.System.currentTimeMillis() is declared as follows −public static long currentTimeMillis()The method returns time difference in milliseconds between the current time and midnight, January 1, 1970 (UTC or epoch time).Let us see a program to compute the elapsed time of an operation in Java −Example Live Demopublic class Example { public static void main(String[] args) throws Exception { // finding the time before the operation is executed long start = System.currentTimeMillis(); ... Read More
To get the elapsed time of an operation in minutes in Java, we use the System.currentTimeMillis() method. The java.lang.System.currentTimeMillis() returns the current time in milliseconds.Declaration −The java.lang.System.currentTimeMillis() is declared as follows −public static long currentTimeMillis()The method returns time difference in milliseconds between the current time and midnight, January 1, 1970 (UTC or epoch time).Let us see a program to compute the elapsed time of an operation in minutes in Java −Example Live Demopublic class Example { public static void main(String[] args) throws Exception { // finding the time before the operation is executed long ... Read More
Use the + Integer.toHexString() method in Java to convert integer to hexadecimal.Let’s say the following is our integer.int val = 768;Let us convert it to a hexadecimal value.Integer.toHexString(val)The following is the final example with the output.Example Live Demopublic class Demo { public static void main(String[] args) { int val = 768; // integer System.out.println("Integer: "+val); // hex System.out.println("Hex String = " + Integer.toHexString(val)); } }OutputInteger: 768 Hex String = 300
To get the elapsed time of an operation in hours in Java, we use the System.currentTimeMillis() method. The java.lang.System.currentTimeMillis() returns the current time in milliseconds.Declaration −The java.lang.System.currentTimeMillis() is declared as follows −public static long currentTimeMillis()The method returns time difference in milliseconds between the current time and midnight, January 1, 1970 (UTC or epoch time).Let us see a program to compute the elapsed time of an operation in hours in Java −Example Live Demopublic class Example { public static void main(String[] args) throws Exception { // finding the time before the operation is executed long ... Read More
Static variables are variables that remain in memory while the program is running i.e. their lifetime is the entire program run. This is different than automatic variables as they remain in memory only when their function is running and are destroyed when the function is over.The static variables are stored in the data segment of the memory. The data segment is a part of the virtual address space of a program.All the static variables that do not have an explicit initialization or are initialized to zero are stored in the uninitialized data segment( also known as the BSS segment). Compared ... Read More
Use the Trim() method to remove leading and trailing whitespace from a string. Let’s say the following is our string with white spaces in the beginning and the end.String str = " a ";Now, use the trim() method.str.trim()The following is the final example with output.Example Live Demopublic class Demo { public static void main(String[] args) { String str = " a "; System.out.println("Text = "+str); System.out.println("Text after using trim() method = " + str.trim()); } }OutputText = a Text after using trim() method = a
To get the elapsed time of an operation in days in Java, we use the System.currentTimeMillis() method. The java.lang.System.currentTimeMillis() returns the current time in milliseconds.Declaration −The java.lang.System.currentTimeMillis() is declared as follows −public static long currentTimeMillis()The method returns time difference in milliseconds between the current time and midnight, January 1, 1970 (UTC or epoch time).Let us see a program to compute the elapsed time of an operation in days in Java −Example Live Demopublic class Example { public static void main(String[] args) throws Exception { // finding the time before the operation is executed long ... Read More
g++GNU C++ Compiler ( g++ ) is a compiler in Linux which is used to compile C++ programs. It compiles both files with extension .c and .cpp as C++ files.The following is the compiler command to compile C++ program.g++ program.cpp -o filenameHere,filename − The name of file with .c or .cpp extension.The following is an example of using g++ compiler.Example Live Demo#include using namespace std; int main() { int a = 20; cout
intThe datatype int is used to store the integer values. It could be signed or unsigned. The datatype int is of 32-bit or 4 bytes. It requires less memory area than long to store a value. The keyword “int” is used to declare an integer variable.The following is the syntax of int datatype.int variable_name;Here,variable_name − The name of variable given by user.The following is an example of int datatype.Example Live Demo#include using namespace std; int main() { int a = 8; int b = 10; int c = a+b; cout