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6.8

truncting float point in JAVA and C++

Asked by lily1102 in C++ Programming Language, Java Programming Language

Deal experts,

I have two programs; one is written in JAVA and another in C++. They have exactly the same functionality. In the program, there are some values computed and then sorted. However, the two program sometimes get different results. The reason is because of the precision. For example,
in Java, a = 0.1234567891234567230001
b = 0.1234567891234567230000
a>b
in C++, a = 0.1234567891234567230001
b = 0.1234567891234567240002
a<b
If there are sorted, C++ will get difference results from JAVA.
I am thinking that truncting the values to the 12 dicimal places and then using the truncated values to sort.
How I can do this kind of truncation to make sure they are all zeros after the 12 dicimal places. For example, a=b=0.123456789123 in java and also in C++ after applying the trunction.
Thanks so much.

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truncting float point in JAVA and C++

Asked by lily1102 in C++ Programming Language, Java Programming Language

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