while True:
a=input('Enter positive integer= ')
if a>'0':
print('Valid')
else:
print('Invalid')
while (true) {
let z = prompt(‘Type D for Decimal conversion,\nB for Binary conversion,\nO for Octal conversion,\nH for Hexadecimal conversion\n’).toUpperCase();
console.log();
function dash() {
console.log(‘—————‘);
}
if (z === ‘D’) {
let a = prompt(‘Enter Decimal value= ‘);
if (!isNaN(a)) {
a = parseInt(a);
let b = a.toString(2);
let c = a.toString(8);
let d = a.toString(16).toUpperCase();
console.log(`Binary of ${a} is ${b}`);
console.log(`Octal of ${a} is ${c}`);
console.log(`Hexadecimal of ${a} is ${d}`);
dash();
} else {
console.log(‘Invalid input’);
dash();
}
}
console.log();
if (z === ‘B’) {
let a = prompt(‘Enter Binary value= ‘);
let a1 = a;
if (/^[01]+$/.test(a)) {
let decimalValue = parseInt(a, 2);
let c = decimalValue.toString(8);
let d = decimalValue.toString(16).toUpperCase();
console.log(`Decimal of ${a1} is ${decimalValue}`);
console.log(`Octal of ${a1} is ${c}`);
console.log(`Hexadecimal of ${a1} is ${d}`);
dash();
} else {
console.log(‘Invalid input’);
dash();
}
}
console.log();
if (z === ‘O’) {
let a = prompt(‘Enter Octal value= ‘);
let a1 = a;
if (/^[0-7]+$/.test(a)) {
let decimalValue = parseInt(a, 8);
let b = decimalValue.toString(2);
let d = decimalValue.toString(16).toUpperCase();
console.log(`Decimal of ${a1} is ${decimalValue}`);
console.log(`Binary of ${a1} is ${b}`);
console.log(`Hexadecimal of ${a1} is ${d}`);
dash();
} else {
console.log(‘Invalid input’);
dash();
}
}
console.log();
if (z === ‘H’) {
let a = prompt(‘Enter Hexadecimal value= ‘).toUpperCase();
let a1 = a;
if (/^[0-9A-F]+$/.test(a)) {
let decimalValue = parseInt(a, 16);
let b = decimalValue.toString(2);
let c = decimalValue.toString(8);
let d = decimalValue.toString(16).toUpperCase();
console.log(`Decimal of ${a1} is ${decimalValue}`);
console.log(`Binary of ${a1} is ${b}`);
console.log(`Octal of ${a1} is ${c}`);
dash();
} else {
console.log(‘Invalid input’);
dash();
}
}
console.log();
}
