1.tostring()方法?
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doubled=12345678.2334;
console.writeline(d.tostring("f2"));
console.writeline(d.tostring("###,###.00"));//12,345,678.23
2.math.round()方法?
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math.round(3.44, 1);//returns 3.4.
math.round(3.45, 1);//returns 3.4.
math.round(3.46, 1);//returns 3.5.
math.round(3.445, 1);//returns 3.4.
math.round(3.455, 1);//returns 3.5.
math.round(3.465, 1);//returns 3.5.
math.round(3.450, 1);//returns 3.4.(補0是無效的)
math.round(3.4452, 2);//returns 3.45.
math.round(3.4552, 2);//returns 3.46.
math.round(3.4652, 2);//returns 3.47.
"四捨六入五考慮，五後非零就進一，五後皆零看奇偶，五前為偶應捨 去，五前為奇要進一"
短一點的口訣叫「四捨、六入、五湊偶」
3.double.parse()方法?
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doubled=1.12345;
d=double.parse(d.tostring("0.00"));
4.輸出百分號?
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system.globalization.numberformatinfo provider =newsystem.globalization.numberformatinfo();
provider.percentdecimaldigits = 2;//小數點保留幾位數.
provider.percentpositivepattern = 1;//百分號出現在何處.
doubleresult = (double)1 / 3;//一定要用double型別.
console.writeline(result.tostring("p", provider));
//或
console.writeline((result*100).tostring("#0.#0")+"%");
5.string.format()方法?
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stringstr1 = string.format("",56789);//result: 56,789.0
stringstr2 = string.format("",56789);//result: 56,789.00
stringstr3 = string.format("",56789);//result: 56,789.000
stringstr8 = string.format("",56789);//result: 56789.0
stringstr9 = string.format("",56789);//result: 56789.00
stringstr11 =(56789 / 100.0).tostring("#.##");//result: 567.89
stringstr12 =(56789 / 100).tostring("#.##");//result: 567
C 小數點格式化
1.tostring 方法 double d 12345678.2334 console.writeline d.tostring f2 1234.23 console.writeline d.tostring 00 12,345,678.23 2.math.round 方法 math.round ...
C 小數點格式化
1.tostring 方法 double d 12345678.2334 console.writeline d.tostring f2 console.writeline d.tostring 00 12,345,678.23 2.math.round 方法 math.round 3.44,1 r...
C 小數點格式化
1.tostring 方法 double d 12345678.2334 console.writeline d.tostring f2 console.writeline d.tostring 00 12,345,678.23 2.math.round 方法 math.round 3.44,1 r...