Knowledge point:
1. system. Math. Pi
2. system. Math. truncate () // get the integerProblem:
You need to find the integer part of a decimal or double number.Solution
If a decimal or double number is truncated to the number closest to 0, the integer

1. Discard the fractional part, preserving the integer partparseint (23.56);Results: 232. Rounding up, with decimals on the integer part plus 1Math.ceil (23.56)Results: 243, rounded.Math.Round (23.56)Results: 244, rounding downMath.floor

Let's test how many weeks (integers) I want to get, how many days (remainder)1. Gets the number of days between the specified date and the current dateFirst, use the DateDiff () function to get the number of days from the specified date to the

SQRT (x)
Original title link sqrt (x)Re-implement the root operation.
Because the required root operation only needs to return the integer part, first consider the number of N to be returned.n is the root result of a given x must satisfy n * n x

Adding a method to Object.prototype makes the method available to all objects in such a way that the function, array, string, number, regular expression, and Boolean value are equally applicable. For example, add a method for Function.prototype to

1. Floor () function.Select Floor (3.44), 3.44-floor (3.44)Show:3 0.44For negative and positive numbers this function does not handle the same.No rounding is done for positive numbers. Rounding for negative numbers.2.Select CAST (12.3 as int),

Conversion between decimal places and binary decimal places1. Convert binary to decimalThe basic practice of converting a binary number into a decimal number is to first write the binary number as an expansion of the weighting coefficient, and then

one or two binary number converted to decimal numberThe basic practice of converting a binary number to a decimal number is to first write the binary number as the weighted coefficient expansion, and then sum it by the decimal addition rule. This

Floating point numbers are the ones with decimals, and they are not just numbers. when I use the payment interface, I have encountered the problem of floating point loss. let's take a look at the solution. let's take a look at the following code: $

The floating point value in php is used to control the output of the floating point. it can be understood as the number of digits of the output. the output results may vary depending on the precision value. note:
The floating point value in php is

In the world of Calculators 2 is the mainstream, and in the natural world of human 10 is the mainstream, then there will inevitably exist in the transformation of the problem. In this chapter we will talk about the transformation of the system, but

This article to give you a brief introduction of the PHP floating point precision value of the instance program, I hope there is a need to understand the accuracy of floating point number of friends can enter the reference.
The precision value of

Explanation: mutual conversion of binary, octal, decimal, and hexadecimal values: in addition to the remainder of 2, the integers are arranged in reverse order, that is, each time an integer is divided by 2, and the remainder is the number on the

Introduction
As we all know, a computer system uses a binary number system, and the machine code and command code it can recognize are all sequences composed of 0 and 1. In our daily life, we use a decimal number system. Why can't computers only use

Binary, octal, decimal, hexadecimal conversion between decimal and binary conversions (1) Decimal conversion to binary, divided into integral part and fractional part ① Integer part method: Except 2 take the remainder method, that is, each time

Let's take a look at the following code:$ F = 0.57;Echo intval ($ f * 100); // 56The result may be a little unexpected. PHP follows IEEE 754 dual precision:Floating point number, expressed in 64-bit dual precision, with one-bit sign bit (E), 11

The precision value of a floating-point number in PHP is used to control the output of the floating-point number. Can be understood as the control of the output of the number of digits, the difference in precision, see the output may also be

Binary, octal, decimal, and hexadecimal are commonly used.
Binary: It is composed of two natural numbers, 0 and 1. The calculation rule is to combine them into one.
Octal ratio: from 0 ~ Seven or eight natural numbers, and the calculation rule is

In Oracle, The String Conversion format of the to_char () function is summarized as follows: to_char (var [, format]) Function Conversion format description: 1. [format] '000000' N indicates the number of numbers in the converted format.If the

one or 10 conversion between binary and binary(1) Decimal conversion to binary, divided into integers and fractional parts① Integer PartMethods: In addition to the 2 method, that is, each time the integer part divided by 2, the remainder is the

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