Number system conversion (function)

Title Description

Write function long change(char s[]), Its function is to convert the hexadecimal number represented by the parameter to the corresponding decimal integer

Input

Number of test data

The first hexadecimal number

The second hexadecimal number

.........

Output

The first decimal number

Second decimal number

........

sample input 1

3
1234
F8
AB12

sample output 1

4660
248
43794

Code

#include<iostream>
using namespace std;
long long change(char s[])
{
	long long sum=0;
	int i;
	for(i=0;s[i];i++)
	{
		if(isdigit(s[i]))
		sum=sum*16+s[i]-'0';
		else
		sum=sum*16+s[i]-'A'+10;
	}
	return sum;
}
int main()
{
	int t;
	cin>>t;
	while(t--)
	{
		char num[20];
		cin>>num;
		cout<<change(num)<<endl;
	}
}