Answer Posted / sachin

package abc;

public class Sachin {

int n=4;
public static void main(String... args){
Sachin s=new Sachin();
for (int i=0;i<s.n;i++){
if(i%2==0){
for(int a=0; a<i+1;a++){
System.out.print("@");
}
}else{
for(int a=0; a<i+1;a++){
System.out.print(a+1);
}
}
System.out.println();
}
}
}

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