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Change the expression of number

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Quynh tran
Quynh tran 2017-5-24
评论： Quynh tran 2017-5-25
Dear all,
I have this number
A=0.1235689745654
but when I need to show it, just only 4 number after dot "." was shown like this.
A =0.1236
But I want it's shown like this
A=0.1235689745654
Could you help me to fix it. Thanks

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Walter Roberson
Walter Roberson 2017-5-24
format long g
and then display the number
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Quynh tran
Quynh tran 2017-5-25
Thank you so much @Walter Roberson

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