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Possible Duplicate: long double vs double I am unable to understand the difference between between long double and double in C and C++. Can anyone help? En double se pueden almacenar números más grandes y también más decimales.
Understanding the Context
Con los números que has probado no se ve diferencia porque cout << redondea la representación interna para mostrar pocos decimales, y lo que ves en ambos casos es lo mismo, pero internamente no son iguales. I've read about the difference between double precision and single precision. However, in most cases, float and double seem to be interchangeable, i.e. using one or the other does not seem to affec...
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A Double in Java is the class version of the double basic type - you can use doubles but, if you want to do something with them that requires them to be an object (such as put them in a collection), you'll need to box them up in a Double object. 20 Format %lf is a perfectly correct printf format for double, exactly as you used it. There's nothing wrong with your code. Format %lf in printf was not supported in old (pre-C99) versions of C language, which created superficial "inconsistency" between format specifiers for double in printf and scanf. From what I have read, a value of data type double has an approximate precision of 15 decimal places.
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However, when I use a number whose decimal representation repeats, such as 1.0/7.0, I find tha... Using long double I get 18/19 = 0.947368421052631578..., and 947368421052631578 is the repeating decimal. Using double I get 0.947368421052631526... However, the former is correct. Why such an inco...