C :

#include<stdio.h>

void main(){
	int i,g,s,b;
	
	for(i=100;i<=999;i++){
		g=i%10;
		s=i/10%10;
		b=i/100;
		if(g==b&&i%2==0){
			printf("%d\n",i);
		} 
	} 
}

C++ :

#include <bits/stdc++.h>
using namespace std;

int main(){
	int i,g,s,b;
	for(i = 100;i <= 999;i++){
		b = i / 100;
		s = i / 10 % 10;
		g = i % 10;
		if(b == g && i % 2 == 0){
			cout<<i<<endl;
		}
	}
    return 0;
}

Python :

for n in range(100,1000):
    a=n//100
    b=n//10%10
    c=n%10
    if a==c and c%2==0:
        print(n)