c - 'float' vs. 'double' precision - Stack Overflow
The 53 bits of double s give about 16 digits of precision. The 24 bits of float s give about 7 digits of precision.

What is the difference between float and double? - Stack Overflow
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...

Correct format specifier for double in printf - Stack Overflow
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.

c++ - double and accuracy - Stack Overflow
A double which is usually implemented with IEEE 754 will be accurate to between 15 and 17 decimal digits. Anything past that can't be trusted, even if you can make the compiler display it.

How do I print a double value with full precision using cout?
In my earlier question I was printing a double using cout that got rounded when I wasn't expecting it. How can I make cout print a double using full precision?

c++ - Double precision - decimal places - Stack Overflow
From what I have read, a value of data type double has an approximate precision of 15 decimal places. However, when I use a number whose decimal representation repeats, such as 1.0/7.0, I find tha...

Difference between long double and double in C and C++
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?

Integer division: How do you produce a double? - Stack Overflow
double d = ((double) num) / denom; But is there another way to get the correct double result? I don't like casting primitives, who knows what may happen.

What's the difference between LONG float and double in C++?
Promise. But, in C++, when calling scanf and printf, the notation used to specify a double is "%lf", and that stands for long float, right? So while a float is less precise than a double, a LONG float (presumedly called long float because it can be "longer" by having more terms) is the same accuracy and therefore essentially the same thing?

What's the difference between a single precision and double precision ...
The term double precision is something of a misnomer because the precision is not really double. The word double derives from the fact that a double-precision number uses twice as many bits as a regular floating-point number. For example, if a single-precision number requires 32 bits, its double-precision counterpart will be 64 bits long.