Magic number

 Magic number

Problem Statement

A magic number is a natural number that contains both the digits 7 and 9 in it. For eg:- 79, 879, 53729 etc.
Given a number N, your task is to find the closest Magic number from the given number N.

static boolean check(int n){

boolean s=false;

boolean p=false;

while(n>0){

if(n%10==7){s=true;}

if(n%10==9){p=true;}

n/=10;

}

if(s && p){return false;}

return true;

}

static int MagicNumber(int n){

int i=0;

while(check(n-i)==true && check(n+i)==true){

i++;

}

if(check(n-i)==false){return n-i;}

else{

return n+i;}

}