added a js program

2022-Oct/24 Oct 2022/index.js

@@ -0,0 +1,38 @@
+// program to solve quadratic equation
+let root1, root2;
+
+// take input from the user
+let a = prompt("Enter the first number: ");
+let b = prompt("Enter the second number: ");
+let c = prompt("Enter the third number: ");
+
+// calculate discriminant
+let discriminant = b * b - 4 * a * c;
+
+// condition for real and different roots
+if (discriminant > 0) {
+  root1 = (-b + Math.sqrt(discriminant)) / (2 * a);
+  root2 = (-b - Math.sqrt(discriminant)) / (2 * a);
+
+  // result
+  console.log(`The roots of quadratic equation are ${root1} and ${root2}`);
+}
+
+// condition for real and equal roots
+else if (discriminant == 0) {
+  root1 = root2 = -b / (2 * a);
+
+  // result
+  console.log(`The roots of quadratic equation are ${root1} and ${root2}`);
+}
+
+// if roots are not real
+else {
+  let realPart = (-b / (2 * a)).toFixed(2);
+  let imagPart = (Math.sqrt(-discriminant) / (2 * a)).toFixed(2);
+
+  // result
+  console.log(
+    `The roots of quadratic equation are ${realPart} + ${imagPart}i and ${realPart} - ${imagPart}i`
+  );
+}