Converting float value to string without decimal separator

Question

I have float values from 00.00 to 99.99 range. I am trying to convert the float value to a string along with the conversion should remove decimal separator.

flaot a = 00.17;
float b = 08.56;

To remove decimal separator I am multiplying with *100 and converting to string using ftoa() function.

a = a*100;
b = b*100;

ftoa(a, 0, temp_string);
puts(temp_string); 
ftoa(b, 0, temp_string);

output is: 17, 856, 2898

My output string should look like this

output: 0017,0856,2898

I can add 0's to string with a condition whether the number is below 99 add two zero's and if above 99 and below 999 add one zero.

Is there any best method to do this work?

I suggest to use a a printf that adds leading 0. See stackoverflow.com/questions/153890/printing-leading-0s-in-c — Jonny Schubert
– Jonny Schubert, Commented Jan 8, 2019 at 13:34
Will float values always be near xx.yy000..., in which case this good answer suffices. But if you want the best answer for values near ``xx.yy5000...`, additional work is needed. — chux
– chux, Commented Feb 22, 2019 at 7:56

mr_Alex_Nok_ · Accepted Answer · 2019-01-08 14:28:02Z

3

Using printf/sprintf you can state the width of a number you wish to print and therefore have leading 0s.

a = a*100;
b = b*100;
c = c*100;
printf ("a=%04.0f b=%04.0f", a, b);

gives:

a=0017 b=0856

See http://www.cplusplus.com/reference/cstdio/printf/ for more

sprintf will format a string instead of printing to stdout so you can then output this how you wish.

edited Jan 8, 2019 at 14:28

answered Jan 8, 2019 at 13:41

mr_Alex_Nok_

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4 Comments

chux Over a year ago

mr_Alex_Nok_, To @Sourav Ghosh point, this answer could indicate the multiplication. e.g. printf ("a=%04.0f", a*100.0);. Note that *100 vs *100.0 could make a difference with values near xx.xx5. I recommend *100.0 for correctness in those edge cases.

verendra Over a year ago

sprintf(mystring, "%05d", myInt); is to lead zeros for integer. if i use same with sprintf(mystring, "%05s", tempString); then it only adding spaces not zeors?? not working for string

verendra Over a year ago

i am trying to build bigger string so i have to convert float to string and add lead zeros and then build string.

mr_Alex_Nok_ Over a year ago

@verendra - you can do this easily with sprintf. Either as separate strings which you can then concatenate or as one long string. Be careful of string terminators '\0' or course

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