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ulong UInt64 8
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inta, b=10, c=int.Parse(355), d=b+c, e=short.MaxValue;
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float Single 4 7 ≈|10-45|÷≈|1038|
double Double 8 15 ≈|10-324|÷≈|10308|
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0.5 => 0,5.5 => 0,5 2.5 E2 => 2,5*102 => 250,0
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a=10;
b=5;
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inta =10;
a +=3; // a = a +3; a =13
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