All Questions
Tagged with printf floating-point
220 questions
-2
votes
2
answers
69
views
How to print a list of float64 with justified decimal point in Go
I would like to print a slice of float64 values line by line having all decimal points at the same position in each line. I could print the integer part right justified, the decimal point and then the ...
5
votes
1
answer
264
views
How do I convert a `float` to a `_Float16`, or even initialize a `_Float16`? (And/or print with printf?)
I'm developing a library which uses _Float16s for many of the constants to save space when passing them around. However, just testing, it seems that telling GCC to just "set it to 1" isn't ...
1
vote
2
answers
96
views
How to combine significant figures, column width, and alignment specifiers?
I would like to print doubles with consistent column width. Theses numbers represent dollar values so I would also like to have no more than two digits after the decimal print.
Here I'm intending to ...
- 19
1
vote
1
answer
132
views
bash printf broken for floats
I have a bash script that gets battery information.
Here's part of it:
#!/bin/bash
if [ -f /sys/class/power_supply/BAT0/energy_full ]; then
EF=$( echo $(cat /sys/class/power_supply/BAT0/energy_full)...
- 13
1
vote
1
answer
112
views
Why isn't printf printing a float passed by a variable? [duplicate]
Why is the following:
int main(void)
{
double b = 11/2;
double a = 2;
printf("%lf\n", a + b);
printf("%lf\n", b);
}
printing, respectively, 7.000000 and 5.000000
I ...
2
votes
1
answer
111
views
How do you support both doubles and long doubles without changing format specifiers?
I was able to compile xnec2c with long double's by simply search-replacing double with long double. It calculates correctly, except anywhere that a format specifier is used because it wants %Lf... ...
- 1,951
1
vote
1
answer
87
views
Trouble with getting a function to calculate and loop correctly in C
I am needing to make a program to take user input of iterations to the formula : PI=4(1/1 -(1/3)+(1/5) ... repeating a number of times. MY problems so far is that it is not taking my input accurately.
...
- 43
0
votes
2
answers
223
views
Using %f but get "format %f expects type double"
Unless I'm tired I do not understand the following warning. I am not sure what the compiler is based on (it's MPLAB X 6 using XC16 from Microchip for a dsPIC33 microcontroller).
float test=5.5;
printf(...
- 2,591
2
votes
3
answers
586
views
What is the maximum string length for %g float representation?
How big does a stack allocated string need to be in order to store any float/double in %g format?
int main()
{
float f;
double d;
char f_str[ ?? ];
char d_str[ ?? ];
...
1
vote
2
answers
95
views
How to compute precision for conversion specification %.*f to maintain precision of floating-point value?
Note: this question originated from this answer.
How to compute precision for conversion specification %.*f to maintain precision of floating-point value?
Note: Here the "maintain precision" ...
- 6,530
6
votes
2
answers
203
views
Interpreting the format specifier in printf("%# 01.1g",9.8)
Consider the following printf instruction:
printf("%# 01.1g", 9.8);
what should it print?
I'm reading the description of the g specifier on cppreference.com, which says (text for G removed):...
- 133k
5
votes
0
answers
169
views
How to round float numbers in Haskell just like in C using printf?
I have a simple code to read a float number and print it with six decimal places.
I have my C code working and I want to make an equal one to Haskell language without installing any extra library.
My ...
- 1,447
2
votes
1
answer
509
views
How to use scanf to read a floating point value in nasm x86 64?
I'm trying to simply read a floating point value and print it using assembly x86 64. So, the value for the variable price, which I'm using as the buffer for the c function scanf doesn't change when I ...
- 454
2
votes
3
answers
273
views
Longest possible %a string for floats and doubles?
When using the %a specifier with the printf family of functions, what is the longest possible string that results for a float and for a double?
Assume that float and double are IEEE-754 32-bit and 64-...
- 401
1
vote
1
answer
232
views
How can I printf() a float in hexadecimal form?
In C we can produce hexadecimal floating point literals and we can also use printf() to output them in decimal string form:
printf("%f\n", 0x1.0p8); // Prints 256.00000
How can I output a ...
- 4,941
