Question

In: Computer Science

Use Math.random function to generate a number between 20 and 100 and then use the ngSwitch...

Use Math.random function to generate a number between 20 and 100 and then use the ngSwitch directive to display a letter grade based on this class grading policy.
1. add implements OnInit to the AppComponent class
2. add variable x in the AppComponent class
3. add ngOnInit(){ this.x = Math.floor(Math.random()*10);}
4. add {{x}} in the app.components.html file
5. You should see numbers from 1-9 when you refresh the page
6. Change formula in #c to generate numbers from 20 to 100.
7. Change {{x}} in #d to ngSwitch directive

Use attribute directives to display credit card logo based on the credit card number

4 visa

5 mastercard

34 and 37 amex

30, 36, 38, 39 diners

60, 64, 65 discover

Expert Solution

import { Component, OnInit } from 'angular/core';

@Component({

selector: 'app-root',

templateUrl: '.app.component.html',

styleUrls: ['./app.component.css']

})

export class AppComponent implements onInit {

title = 'title';

x: number;

ngOnInit(){

this.x = Math.floor(Math.random()*10);

}

Here is the app.component.html file:

<head>
<meta charset="utf-8">
<title>Angular</title>
<base href="/">

<body>
<app-root></app-root>
<div style="text-align:center">
<h1>
Welcome to {{x}}.
</h1>
</div>

</body>
</html>

f.As C does not have an inbuilt function for generating a number in the range, but it does have rand function which generate a random number from 0 to RAND_MAX. With the help of rand () a number in range can be generated as num = (rand() % (upper – lower + 1)) + lower

// C program for generating a

// random number in a given range.

#include <stdio.h>

#include <stdlib.h>

#include <time.h>

// Generates and prints 'count' random

// numbers in range [lower, upper].

void printRandoms(int lower, int upper,

int count)

{

int i;

for (i = 0; i < count; i++) {

int num = (rand() %

(upper - lower + 1)) + lower;

printf("%d ", num);

}

// Driver code

int main()

{

int lower = 5, upper = 7, count = 1;

// Use current time as

// seed for random generator

srand(time(0));

printRandoms(lower, upper, count);

return 0;

}

Output:

7

11

Three things to keep in mind ngSwitch, ngSwitchCase and ngSwitchDefault.

ngSwitch - set the property value of model. For example - viewMode, which is a property in your component.

ngSwitchCase - Defines what to render when the value of the property defined in ngSwitchChanges. For ex. when viewMode = 'map'

ngSwitchDefault - Defines what to render if the value doesn't match. For ex. when viewMode=undefined. The default will be rendered.

Another important point is that we need to set the [ngSwitchCase] within a <template></template> HTML element otherwise it will not work. Angularwill automatically convert it into a <div> tag.

Map View Content...

</template>

List View Content...

</template>

</div>

venereology answered 1 month ago

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