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cfloating-point
Roman Rdgz
Roman Rdgz

Reputation: 13244

C: printf a float value

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.

If my float is 44.556677, I'm printing out "44.55", only the first two decimal digits.

So the question is... how can I print my 6 digits (and just the six of them, just in case I'm having zeros after that or something)?

Upvotes: 128

Views: 904447

Answers (7)

Ihor Shubin
Ihor Shubin

Reputation: 10726

printf("%.<number>f", myFloat) //where <number> - digit after comma

https://cplusplus.com/reference/cstdio/printf/

Upvotes: 10

Roberto A. Foglietta
Roberto A. Foglietta

Reputation: 61

Try these to clarify the issue of right alignment in float point printing

printf(" 4|%4.1lf\n", 8.9);
printf("04|%04.1lf\n", 8.9);

the output is

 4| 8.9
04|08.9

Upvotes: 6

Roman Byshko
Roman Byshko

Reputation: 9002

You can do it like this:

printf("%.6f", myFloat);

6 represents the number of digits after the decimal separator.

Upvotes: 224

Charlie Brown
Charlie Brown

Reputation: 144

Use %.6f. This will print 6 decimals.

Upvotes: 2

rohit
rohit

Reputation: 330

printf("%0k.yf" float_variable_name)

Here k is the total number of characters you want to get printed. k = x + 1 + y (+ 1 for the dot) and float_variable_name is the float variable that you want to get printed.

Suppose you want to print x digits before the decimal point and y digits after it. Now, if the number of digits before float_variable_name is less than x, then it will automatically prepend that many zeroes before it.

Upvotes: 10

Sergey Kalinichenko
Sergey Kalinichenko

Reputation: 726479

printf("%9.6f", myFloat) specifies a format with 9 total characters: 2 digits before the dot, the dot itself, and six digits after the dot.

Upvotes: 42

Shankar Raju
Shankar Raju

Reputation: 4546

You need to use %2.6f instead of %f in your printf statement

Upvotes: 0

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