Answer wrong is given by this code

#1

#include
#include
using namespace std;

int main() {

int n,N,s=0,p,x=0;
cin>>N;

for(int i=0;i<N;i++){
	cin>>n;
	while(n>0){
		
		n=n%10;
		p=pow(2,x);
		x++;
		s=s+p*n;
		n=n/10;
		
	}
		cout<<s<<endl;;
		
	
}



return 0;

}

this code giving wrong answer

#2

hi @yashtripathi6969_0cd127807d833066 refer

#include <iostream>

using namespace std;
int bintodec(int nos){
    int base = 1;
	int decval =0;
	while(nos){
		int lastdig = nos%10;
		nos=nos/10;
		decval+= lastdig*base;
		base*=2;
	}
	return decval;
    
}
int main(){
    int N,nos;
    cin>>N;
    for (int i = 1;i<=N;i++){
        cin>>nos;
    	cout<<bintodec(nos)<<endl;
    }
}
#3

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