index.ts

#! /usr/bin/env node
import inquirer from "inquirer"
// Asking for roll number
let roll = await inquirer.prompt({
    type: "number",
    name: "num1",
    message: "Please enter your roll number:"
});
// rollnumber
let rollNumber:number = roll.num1
// checking rollnumber
if(rollNumber === 456789) {
// Asking for marks
let marks = await inquirer.prompt([
    {
        name : "typescript",
        type: "number",
        message: "Please enter your typescript number:",
    },
    {
        name : "python",
        type: "number",
        message: "Please enter your python number:",
    },
    {
        name : "csharp",
        type: "number",
        message: "Please enter your csharp number:",   
    }
])
// extract marks
let ts:number = marks.typescript
let pyth:number = marks.python
let c_sharp:number = marks.csharp

// percentage
let totalMarks : number = 300
let obtainMarks : number = ts + pyth + c_sharp
let percentage = ((obtainMarks / totalMarks)*100)
// Answer
console.log("Name: Ali")
console.log("Father Name: Hassan")
console.log(`Typescript Marks = ${ts}out of 100`)
console.log(`python Marks = ${pyth}out of 100`)
console.log(`csharp Marks = ${c_sharp}out of 100`)
console.log(`Obtain Marks = ${obtainMarks} Total Marks = ${totalMarks}`)
console.log(`Percentage = ${percentage}%`)

if (percentage >=80){
    console.log("Grade A+");
}else if (percentage >=70){
    console.log("Grade A");
}else if (percentage >=60){
    console.log("Grade B");
}else if (percentage >=50){
    console.log("Grade C");
}else if (percentage >=45){
    console.log("Grade D");
} else {console.log("You are Fail!!");
    
}
}
else{
    console.log(`Invalid Wrong Number`)
}