Tag：Floating point number
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Time：2020-1-18
What capabilities do you have All bindings can be performed in onchange by introducing modules without additional initializationData rule = “rule”The form element of the property triggers validation. In addition to the built-in rules (URL, email, integer and floating-point numbers, etc.), it allows users to register new “rules” (see register method). It allows users to […]
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Time：2020-1-18
It’s really unpleasant to learn Java and py again. The previous ones are OK. I’ve started to learn them directly, but I’d better record them. After all, I won’t have to go to college hello #include int main() { printf(“hello,world”); return 0; } 1、 Variable definition The form of variable definition is generally as follows:Type […]
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Time：2019-12-6
1. Direct conversion float k = 1.6; int a = (int)k; NSLog(@”a = %d”,a); The output is 1, (int) is a forced type conversion, which directly discards the decimal part of the floating-point number. 2. Rounding of floor function (rounding down) float k = 1.6; int a = floor(k); NSLog(@”a = %d”,a); The output result […]
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Time：2019-12-2
I. expression of verification number Number: ^ [0-9]$ N digits: ^ \ D {n}$ At least n digits: ^ \ D {n,}$ M-N digits: ^ \ D {m, n}$ Zero and non-zero digits: ^ (0| [1-9] [0-9])$ The number with two decimals at most at the beginning of non-zero: ^ ([1-9] [0-9]) + (. [0-9] […]
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Time：2019-11-2
Basically, a simple variable is a data unit, which can be a number or a string.I. integer1, integerPerl is the most commonly used simple variable. Because it is basically the same as other languages, it will not be repeated.Example: $x = 12345; if (1217 + 116 == 1333) { # statement block goes here }Limit […]
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Time：2019-10-28
Computer completes the relevant representation of floating point number Introduction: Binary decimal It can be imagined that the decimal weight becomes 2. The left side of the decimal point is the weight model of increasing from zero and decreasing from – 1 on the right side. The basic composition of floating point number representation
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Time：2019-6-3
Combine the examples on the Internet $num = 10.4567; // First: Round () is used to round floating-point numbers, but this would not be “two-precision” without two decimal numbers. echo ($num,2); //10.46 echo round(‘1.1’,2); //1.1 // Second: Format strings with sprintf and round them $format_num = (“%.2f”,$num); 2 echo $format_num; //10.46 // The third […]
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Time：2019-3-4
Suppose there is a simple guessing game, in which the user bets big or small, after deducting 3% of the fee, all the money is put into the pool, and the winner divides the pool equally according to the proportion of the betting. Using MySQL as the database, the accuracy of the system is up […]
