从整数获取浮点值 [英] Getting float value from integers

问题描述

如何从整数除法中得到浮点数或实数?例如:

How can I get a float or real value from integer division? For example:

double result = 30/233;

产生零.我想要带小数位的值.

yields zero. I'd like the value with decimal places.

然后如何格式化，以便与字符串一起使用时仅显示两位小数?

How can I then format so only two decimal places display when used with a string?

推荐答案

您可以在分子或分母中添加一个小数:

You could just add a decimal to either the numerator or the denominator:

double result = 30.0 / 233;
double result = 30 / 233.0;

对两个数字之一进行类型转换也可以.

Typecasting either of the two numbers also works.

对于问题的第二部分，如果您使用printf样式的格式字符串，则可以执行以下操作:

As for the second part of the question, if you use printf-style format strings, you can do something like this:

sprintf(str, "result = %.2f", result);

基本上，.2"代表小数点后要输出的位数.

Bascially, the ".2" represents how many digits to output after the decimal point.

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