how can i count the digits of number given by the user

[bettina top]

how can i count the digits of number given by the user

[Meetee]

how can i count the digits of number given by the user

You can take the value in string and can count by counting each char of that string until the end of the string. Search google for more. And if doubt, paste your efforts in the next post.

Regards

[mohammadazim]

You can take the value in string and can count by counting each char of that string until the end of the string. Search google for more. And if doubt, paste your efforts in the next post.

Regards

Above solution is good. But if you some computing you can do as following pseudo code

number = user input
numberDigits = 1
place = 10
while number >= place
{
numberDigits++
place *= 10
}
 

output number

[mailavi]

Above solution is good. But if you some computing you can do as following pseudo code

number = user input
numberDigits = 1
place = 10
while number >= place
{
numberDigits++
place *= 10
}

output number

there is another way....... first u take the number from the user into a variable then divide the number with 10 u would get the unit's place digit the so on to get the individual number and add them........

[MarshMallow]

Ciao Bettina,
please prompt, the user for a string ,not an integer;and then take a look to the ANSI C header <string.h> ,there is the function strlen wich counts the number of characters in a string,that could be useful!

[oler1s]

Simpler method:

Take input into a string. Convert that string into a number. Then number of digits is log(number)+1.

[Ganon11]

Simpler method:

Take input into a string. Convert that string into a number. Then number of digits is log(number)+1.

Just to clarify, this is log with base 10. I'm not sure if the log function in cmath evaluates log base 10, log base 2, or natural log (log base e). To make sure, use log(number)/log(desired base). No matter what base the log function is, dividing by log(desired base) results in the same answer as a log to the correct base of number.

[oler1s]

There's a both a log (natural log) and log10 (base 10 log) function in the math library.

[MarshMallow]

according to compilers,there can be different implementation of the logarithm function;but basically log is computed dividing the input iteratively by ten,checking if it is >0 and incrementing a counter;we know that a microprocessor performs division through a series of right shifts;so computing the logarithm consist basically of shifting,compar ing and incrementing registers;strle n only perfrom a comparison and increment a counter,without stressing ALU with shifts;though strlen algorithm has linear complexity,so it is not a big advantage to use it when the string is "long"