找下列代码中的问题

#include <iostream>
using namespace std;
char c;
unsigned long long x,n=0,point=1,tp,yn;
string s,q,t = "0123456789ABCDEF";
int main(){
	cin >> q;
	cout<<'{';
	if(q[1]=='}'){
		cout<<'}';
		return 0;
	}
	while(point<q.length()){
		s="";
		tp=point;
		while(q[point]>='0'){//||q[point]!='}'
			n*=10;
			n+=q[point]-'0';
			point++;
		}
		yn=n;
			while(n != 0){
				x = n % 16;
			if(x < 10){
				c = x + '0';
			}else{
				c = x + 'A' - 10;
			}
			s = c + s;
			n = n / 16;
		}
		if(s.length()+2>point-tp) {cout<<yn;}
		else {cout<<"0x"<<s;}
		point++;
		if(q[point-1]=='}') break;
		cout<<',';
	}
	cout<<'}';
	return 0;
}

——————————答案——————————

有没有一种可能

‘}’的ASCLL码值是125

而‘9’只有57

所以第18行的条件判断一无是处……