JavaScript: Compute the average and grade of the students

Last update on May 30 2022 10:05:38 (UTC/GMT +8 hours)

JavaScript Conditional Statement and loops: Exercise-6 with Solution

Write a JavaScript program which compute, the average marks of the following students Then, this average is used to determine the corresponding grade.

Student Name	Marks
David	80
Vinoth	77
Divya	88
Ishitha	95
Thomas	68

The grades are computed as follows:

Range	Grade
<60	F
<70	D
<80	C
<90	B
<100	A

Pictorial Presentation:

JavaScript: Compute the average and grade of the students

Sample Solution:-

HTML Code:

<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Compute the average marks and grade</title>
</head>
<body>
  
</body>
</html>

JavaScript Code:

var students = [['David', 80], ['Vinoth', 77], ['Divya', 88], ['Ishitha', 95], ['Thomas', 68]];

var Avgmarks = 0;

for (var i=0; i < students.length; i++) {
        Avgmarks += students[i][1];
        var avg = (Avgmarks/students.length);
}

console.log("Average grade: " + (Avgmarks)/students.length);

        if (avg < 60){
          console.log("Grade : F");      
          } 
        else if (avg < 70) {
                console.log("Grade : D"); 
                  } 
        else if (avg < 80) 
             {
                console.log("Grade : C"); 
        } else if (avg < 90) {
                console.log("Grade : B"); 
        } else if (avg < 100) {
                console.log("Grade : A"); 
}

Sample Output:

Average grade: 81.6
Grade : B

Flowchart:

Live Demo:

See the Pen javascript-conditional-statements-and-loops-exercise-6 by w3resource (@w3resource) on CodePen.

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JavaScript: Tips of the Day

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = []; arr[0] = "Jani"; arr[1] = "Hege"; arr[2] = "Stale"; arr[3] = "Kai Jim"; arr[4] = "Borge"; console.log(arr.join()); arr.splice(2, 0, "Lene"); console.log(arr.join());

Ref: https://bit.ly/2BXbp04