app.component.ts

import {Component } from '@angular/core';

@Component({
    selector: 'my-app',
    template: `<h1>Hello {{pmessage}}</h1>
  <appchild [message]="cmessage"></appchild>
  `
})
export class AppComponent  { 
  
        pmessage : string = "I am Parent";
        cmessage : string = "I came from Parent to child";
    }