JavaScript If-Condition Programs

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Here are 20 JavaScript programs with solutions covering:
✔ if
✔ if-else
✔ if-else if
✔ nested if
✔ one-line (ternary) conditions

🔹 1. Positive number (if)

let num = 5;if (num > 0) {
  console.log("Positive");
}

🔹 2. Even or odd (if-else)

let num = 4;if (num % 2 === 0) {
  console.log("Even");
} else {
  console.log("Odd");
}

🔹 3. Voting eligibility (if-else)

let age = 16;if (age >= 18) {
  console.log("Eligible");
} else {
  console.log("Not eligible");
}

🔹 4. Largest of two numbers (if-else)

let a = 10, b = 20;if (a > b) {
  console.log("a is greater");
} else {
  console.log("b is greater");
}

🔹 5. Divisible by 3 (if)

let num = 9;if (num % 3 === 0) {
  console.log("Divisible by 3");
}

🔹 6. Grade system (if-else if)

let marks = 85;if (marks >= 90) {
  console.log("A");
} else if (marks >= 70) {
  console.log("B");
} else if (marks >= 50) {
  console.log("C");
} else {
  console.log("Fail");
}

🔹 7. Largest of three numbers (if-else if)

let a = 5, b = 8, c = 3;if (a > b && a > c) {
  console.log("a is largest");
} else if (b > c) {
  console.log("b is largest");
} else {
  console.log("c is largest");
}

🔹 8. Leap year (if-else)

let year = 2024;if ((year % 4 === 0 && year % 100 !== 0) || year % 400 === 0) {
  console.log("Leap year");
} else {
  console.log("Not leap year");
}

🔹 9. Check number range (if)

let num = 25;if (num >= 10 && num <= 50) {
  console.log("Within range");
}

🔹 10. Character type (if-else if)

let ch = 'A';if (ch >= 'A' && ch <= 'Z') {
  console.log("Uppercase");
} else if (ch >= 'a' && ch <= 'z') {
  console.log("Lowercase");
} else {
  console.log("Other");
}

🔹 11. Nested if (positive & even)

let num = 8;if (num > 0) {
  if (num % 2 === 0) {
    console.log("Positive and Even");
  }
}

🔹 12. Nested if (login system)

let username = "admin";
let password = "1234";if (username === "admin") {
  if (password === "1234") {
    console.log("Login successful");
  } else {
    console.log("Wrong password");
  }
} else {
  console.log("User not found");
}

🔹 13. Nested if (marks & distinction)

let marks = 75;if (marks >= 40) {
  if (marks >= 75) {
    console.log("Distinction");
  } else {
    console.log("Pass");
  }
} else {
  console.log("Fail");
}

🔹 14. One-line if (ternary)

let num = 10;console.log(num > 0 ? "Positive" : "Not positive");

🔹 15. One-line even/odd

let num = 7;console.log(num % 2 === 0 ? "Even" : "Odd");

🔹 16. One-line pass/fail

let marks = 35;console.log(marks >= 40 ? "Pass" : "Fail");

🔹 17. Multiple conditions (if)

let num = 15;if (num % 3 === 0 && num % 5 === 0) {
  console.log("Divisible by 3 and 5");
}

🔹 18. Temperature check (if-else if)

let temp = 30;if (temp > 40) {
  console.log("Hot");
} else if (temp > 20) {
  console.log("Warm");
} else {
  console.log("Cold");
}

🔹 19. Triangle validity (if)

let a = 3, b = 4, c = 5;if (a + b > c && a + c > b && b + c > a) {
  console.log("Valid triangle");
}

🔹 20. Simple calculator (if-else if)

let a = 10, b = 5;
let op = "+";if (op === "+") {
  console.log(a + b);
} else if (op === "-") {
  console.log(a - b);
} else if (op === "*") {
  console.log(a * b);
} else if (op === "/") {
  console.log(a / b);
} else {
  console.log("Invalid operator");
}

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