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how to convert str to double

how to convert str to double# Programming - 葵花宝典

L*a2009-01-22 08:01

1 楼

做了个胃镜, 收到一个帐单, 总数是$3000, 自己要 copay $400, 有人有类似经历吗?
总觉得不太合理啊, 问了别人说只 copay $20 .

b*d2009-01-22 08:01

2 楼

in c++. i've used sstream, atof, strtod, none of them give me good precision
eg. 112.84375->112.844
haven't try sprintf but i guess it's the same.
i've also tried >>std::setprecios(20) and it doesn't help. the output
container is declared to double.
any idea how to keep the precision in the string? perhaps i have to use
boost lexical cast...

s*i2009-01-22 08:01

3 楼

depends on your insurance. some insurance doesn't have copay,
while some may have high deductible so you may need to pay
whole amount.

y*g2009-01-22 08:01

4 楼

precision
try <<

【在 b*d 的大作中提到】

: in c++. i've used sstream, atof, strtod, none of them give me good precision
: eg. 112.84375->112.844
: haven't try sprintf but i guess it's the same.
: i've also tried >>std::setprecios(20) and it doesn't help. the output
: container is declared to double.
: any idea how to keep the precision in the string? perhaps i have to use
: boost lexical cast...