I have been asked to make an algorithm in Python to know the number of digits in a number, is there a way to do it without the manipulation of strings ?
def achaTamanho(x):
a = str(x)
if len(a) > 1:
if a[0] == '0':
return len(a) - 1
else:
return len(a)
return len(a)
num = int(input("Digite um número: "))
print(achaTamanho(num))
It's always better to do math. I made one use ready mathematical function and another without needing any module. It could simplify doing division, but division costs more than multiplication.
import math
def achaTamanho(numero):
numero = abs(int(numero))
if numero < 2:
return 1
count = 0
valor = 1
while valor <= numero:
valor *= 10
count += 1
return count
def achaTamanho2(numero):
numero = abs(int(numero))
return (1 if numero == 0 else math.floor(math.log10(numero)) + 1)
print(achaTamanho(0))
print(achaTamanho(1))
print(achaTamanho(2))
print(achaTamanho(123))
print(achaTamanho(1000))
print(achaTamanho(-1))
print(achaTamanho(-23))
print(achaTamanho(45678))
print(achaTamanho(9999))
print ("")
print(achaTamanho2(0))
print(achaTamanho2(1))
print(achaTamanho2(2))
print(achaTamanho2(123))
print(achaTamanho2(1000))
print(achaTamanho2(-1))
print(achaTamanho2(-23))
print(achaTamanho2(45678))
print(achaTamanho2(9999))
len (), is not a string manipulation, so the simplest way is: n = int (input ('Enter a number:')) print (n, 'tem', len (str (n)) , 'numbers')