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ProblemFor given number try to find the range in which that number exists.SolutionHere, we are learning how to find the ranges of a number.The logic that we apply to find range is −lower= (n/10) * 10; /*the arithmetic operators work from left to right*/ upper = lower+10;ExplanationLet number n=45Lower=(42/10)*10 // division returns quotient =4*10 =40Upper=40+10=50Range − lower-upper − 40-50ExampleFollowing is the C program for printing the range of numbers −#include main(){ int n, lower, upper; printf("Enter a number:"); scanf("%d", &n); lower= (n/10) * 10; /*the arithmetic operators work from left to right*/ upper ... Read More
ProblemWhat is the C program to obtain the sum of the first and last digit of the number, if a four-digit number is input through the keyboard?SolutionIn this program, we are taking a four-digit number at run time and trying to find the sum of first and last digit of that four-digit number by using the logic −a=n%10; b=n/1000; result = a + b;Let’s apply this logic to find sum of first and last digit of four-digit number −ExampleFollowing is the C program for finding sum of first and last digit by using divide and modulo operator −#include main(){ ... Read More
ProblemHow the C compiler detect that the file was reached the end for while reading? Explain with a program.Solutionfeof() is a file handling function in C language, which is used to find end of a file.The logic we used for finding end of file is as follows −fp = fopen ("number.txt", "r"); //open a file printf ("file content is"); for (i=0;i
In the older versions of PHP, we faced an inconsistency problem. For example: ${$first [‘name’]}. This syntax may create confusion or we can say that the syntax is not consistent. To overcome the inconsistency problem, PHP 7 added the new syntax called “Uniform variable syntax”.The uniform variable syntax evaluates the variables from left to right.We need to add the curly brackets to use the uniform variable syntax. For example, echo ${$first[‘name’]};The uniform variable syntax allows the combinations of operators and also it can break the backward compatibility in some expressions wherever older evaluations are used.ExampleLive DemoOutputOutput for the above PHP ... Read More
PHP 7 takes a Unicode codepoint in hexadecimal form as input and produces the outputs in UTF-8 character format within a double-quoted string. It could be any combination of hexadecimal digits, 2, 4, 6, and above. We can write Unicode characters by using a double-quoted or here docstring, without calling a function. Leading zero is optional in any hexadecimal form. UTF-8 Character Note: We can construct the full Unicode characters using “\u{xxx}” syntax.Some languages, for example, Hebrew and Arabic are read from right to left instead of left to right. We can reverse the text using the ... Read More
An array in PHP is a type of data structure that can store multiple elements of similar data type under a single variable.To display array structure and values in PHP, we can use two functions. We can use var_dump() or print_r() to display the values of an array in human-readable format or to see the output value of the program array.Difference between print_r and var_dumpprint_r: It is used to display the variable information in a human-readable format. Array values will be present in a format so that keys and elements can show. print_r also shows protected and private properties of ... Read More
In the earlier versions of PHP, we could handle only exceptions. It was not possible to handle errors. In the case of a Fatal Error, it used to halt the complete application or some part of the application. To overcome this problem, PHP 7 added the throwableinterface to handle both exceptions and errors.Exception: Wherever a fatal and recoverable error occurs, PHP 7 throws an exception instead of halting the complete application or script execution.Error: PHP 7 throwsTypeError, ArithmeticError, ParserError, and AssertionError, but the warnings and notice errors remain unchanged. Using the try/catch block, error instance can be caught, and now, the ... Read More
Preg_replace_callback_array() function in PHP 7 represents a regular expression and replaces the use of callbacks. This function returns a string or an array of strings to match a set of regular expressions and replaces them using a callback function.Syntaxpreg_replace_callback_array(patterns, input, limit, count)Parameter Values:pattern − It requires an associate array to associate the regular expression patterns to callback functions.input/subject −It requires an array of strings to perform replacements.limit −It is optional. -1 is used for default, which means it is unlimited. It sets a limit to how many replacements can be done in each string.count −It is also optional like the ... Read More
The concept of generator is not new to PHP 7, because it was available in the earlier versions too. With generators, implementation becomes easy without the overhead of implementing a class that implements the iterator interface. With the help of a generator, we can write foreach code without using an array in memory. It also helps to eliminate the “exceed memory limit errors”.With the help of generator delegation in PHP 7, we can delegate to another generator automatically. It also allows arrays and objects that implement the traversable interface.Generator delegation Example 1Live Demo PHP 7 : Tutorialpoint ... Read More
In the previous versions of PHP, generator functions were not able to return expressions, but from the PHP 5.5, generator return expression is added in the existing one. By using generator return expressions, it is easy to use the return statement within a generator and, it also returns the value of the final expression.By using the generator return expression, we can only return the value of the expression but cannot return the reference. By using the new Generator::getReturn() method, we can fetch the value which can be used once the generator function has finished yielding the defined values.Using PHP 7 ... Read More