# What is the precision of float in C?

## What is the precision of float in C?

float is a 32 bit IEEE 754 single precision Floating Point Number1 bit for the sign, (8 bits for the exponent, and 23* for the value), i.e. float has 7 decimal digits of precision.

What is the limit of float in C?

Floating-Point Types

Type Storage size Value range
float 4 byte 1.2E-38 to 3.4E+38
double 8 byte 2.3E-308 to 1.7E+308
long double 10 byte 3.4E-4932 to 1.1E+4932

### Is %f for float in C?

7 Answers. 3.00 is interpreted as a double , as opposed to 3.00f which is seen by the compiler as a float . The f suffix simply tells the compiler which is a float and which is a double .

What is the difference between %F and LF?

For scanf , you should use %f for float and %lf for double . More detail for the language lawyers among us below: There is no difference between %f and %lf in the printf family.

## What is the limit of float?

Range of Floating-Point Types

Type Minimum value Maximum value
float 1.175494351 E – 38 3.402823466 E + 38
double 2.2250738585072014 E – 308 1.7976931348623158 E + 308

How to printf a float value in C?

If I just use printf (“%f”, myFloat) I’m getting a truncated value. I don’t know if this always happens in C, or it’s just because I’m using C for microcontrollers (CCS to be exact), but at the reference it tells that %f get just that: a truncated float. If my float is 44.556677, I’m printing out “44.55”, only the first two decimal digits.

### How to print a truncated float in C?

I want to print a float value which has 2 integer digits and 6 decimal digits after the comma. If I just use printf (“%f”, myFloat) I’m getting a truncated value. I don’t know if this always happens in C, or it’s just because I’m using C for microcontrollers (CCS to be exact), but at the reference it tells that %f get just that: a truncated float.

How to print float as hex bytes format?

Using a union still is not endian correct as endian of of a float and an int may differ – though that is uncommon. Additional issues exist for rare platforms that have more than 8 bits to a char. The easy alternative is to use “%a” @user2357112 which will print the mantissa/significand in hexadecimal and the exponent in decimal powers-of-2.

## Is there union between float and unsigned pointers?

To do that while avoiding violating the strict aliasing rule (type punning pointers), you can use a union between float and unsigned (or better uint32_t for exact width type), e.g.