Define an algorithm that converts a string to an integer without using a built in method like int()

Question

DVD · Accepted Answer

in Java:

String f = "2456";
int length = f.length();
		
double result = 0;
		
for (int i = 0; i < length; i++) {
	char c = f.charAt(i);
	int x = c - 48;
	double exp = Math.pow(10,length-1-i);
	result = result + (exp*x);		
}

int myInt = (int)result;

userisyo · Answer

Complete python program to convert from string to int.

Complexity: o(n), where n is the number of digits of s.

----
s = '2456'
n = 0
p10 = 1
for d in reversed(s):
    n += p10 * (ord(d) - ord('0'))
    p10 *= 10

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