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13. Write a JavaScript program to convert temperatures to and from celsius, fahrenheit.


function cToF(celsius)
{
var cTemp = celsius;
var cToFahr = cTemp * 9 / 5 + 32;
var message = cTemp+'\xB0C is ' + cToFahr + ' \xB0F.';
console.log(message);
}

function fToC(fahrenheit)
{
var fTemp = fahrenheit;
var fToCel = (fTemp - 32) * 5 / 9;
var message = fTemp+'\xB0F is ' + fToCel + '\xB0C.';
console.log(message);
}
cToF(60);
fToC(45);

14. Write a JavaScript program to check if two numbers are in range 40..60 or in the range 70..100 inclusive.

function numbers_ranges(x, y) {
if ((x >= 40 && x <= 60 && y >= 40 && y <= 60)
||
(x >= 70 && x <= 100 && y >= 70 && y <= 100))
{
return true;
}
else
{
return false;
}
}

console.log(numbers_ranges(44, 56));
console.log(numbers_ranges(70, 95));
console.log(numbers_ranges(50, 89));

15. Write a JavaScript program to check if the last digit of the three given positive integers is same.  

function last_digit(x, y, z)
{
if ((x > 0) && y > 0 && z > 0)
{
return (x % 10 == y % 10 && y % 10 == z % 10 && x % 10 == z % 10);
}
else
return false;
}

console.log(last_digit(20, 30, 400));
console.log(last_digit(-20, 30, 400));
console.log(last_digit(20, -30, 400));
console.log(last_digit(20, 30, -400));

16. Write a JavaScript program to create a new string with first 3 characters are in lower case from a given string. If the string length is less than 3 convert all the characters in upper case.

function upper_lower(str) {
if (str.length < 3) {
return str.toUpperCase();
}
front_part = (str.substring(0, 3)).toLowerCase();
back_part = str.substring(3, str.length);
return front_part + back_part;
}
console.log(upper_lower("Python"));
console.log(upper_lower("Py"));
console.log(upper_lower("JAVAScript"));

17. Write a JavaScript program to compute the absolute difference between a specified number and 19. Returns triple their absolute difference if the specified number is greater than 19.

function diff_num(n) {
if (n <= 19) {
return (19 - n);
}
else
{
return (n - 19) * 3;
}
}

console.log(diff_num(12));
console.log(diff_num(19));
console.log(diff_num(22));

18. Write a JavaScript program to check two given numbers and return true if one of the number is 50 or if their sum is 50.

function test50(x, y)
{
return ((x == 50 || y == 50) || (x + y == 50));
}
console.log(test50(50, 50))
console.log(test50(20, 50))
console.log(test50(20, 20))
console.log(test50(20, 30))

Kishan Rami:
19. Write a JavaScript program to check a given integer is within 20 of 100 or 400

function testhundred(x) {
return ((Math.abs(100 - x) <= 20) ||
(Math.abs(400 - x) <= 20));
}

console.log(testhundred(10));
console.log(testhundred(90));
console.log(testhundred(99));
console.log(testhundred(199));
console.log(testhundred(200));

20. Write a JavaScript program to check from two given integers, if one is positive and one is negative.

function positive_negative(x, y)
{
if ((x < 0 && y > 0) || x > 0 && y < 0)
{
return true;
}
else
{
return false;
}
}
console.log(positive_negative(2, 2));
console.log(positive_negative(-2, 2));
console.log(positive_negative(2, -2));
console.log(positive_negative(-2, -2));

21. Write a JavaScript program to create a new string adding "Py" in front of a given string. If the given string begins with "Py" then return the original string.

function string_check(str1) {
if (str1 === null || str1 === undefined || str1.substring(0, 2) === 'Py')
{
return str1;
}
return "Py"+str1;
}

console.log(string_check("Python"));
console.log(string_check("thon"));

22. Write a JavaScript program to remove a character at the specified position of a given string and return the new string.

function remove_character(str, char_pos)
{
part1 = str.substring(0, char_pos);
part2 = str.substring(char_pos + 1, str.length);
return (part1 + part2);
}

console.log(remove_character("Python",0));
console.log(remove_character("Python",3));
console.log(remove_character("Python",5));

23. Write a JavaScript program to create a new string from a given string changing the position of first and last characters. The string length must be greater than or equal to 1.

function first_last(str1)
{
if (str1.length <= 1)
{
return str1;
}
mid_char = str1.substring(1, str1.length - 1);
return (str1.charAt(str1.length - 1)) + mid_char + str1.charAt(0);
}
console.log(first_last('a'));
console.log(first_last('ab'));
console.log(first_last('abc'));

24. Write a JavaScript program to create a new string from a given string with the first character of the given string added at the front and back.

function front_back(str)
{
first = str.substring(0,1);
return first + str + first;
}
console.log(front_back('a'));
console.log(front_back('ab'));
console.log(front_back('abc'));

25. Write a JavaScript program check if a given positive number is a multiple of 3 or a multiple of 7.

function test37(x)
{
if (x % 3 == 0 || x % 7 == 0)
{
return true;
}
else {
return false;
}
}

console.log(test37(12));
console.log(test37(14));
console.log(test37(10));
console.log(test37(11));

26. Write a JavaScript program to create a new string from a given string taking the last 3 characters and added at both the front and back. The string length must be 3 or more.

function front_back3(str)
{
if (str.length>=3)
{
str_len = 3;

back = str.substring(str.length-3);
return back + str + back;
}
else
return false;
}
console.log(front_back3("abc"));
console.log(front_back3("ab"));
console.log(front_back3("abcd"));

27. Write a JavaScript program to check if a string starts with 'Java' and false otherwise.

function start_spec_str(str)
{
if (str.length < 4)
{
return false;
}
front = str.substring(0, 4);
if (front == 'Java')
{
return true;
}
else
{
return false;
}
}

console.log(start_spec_str("JavaScript"));
console.log(start_spec_str("Java"));
console.log(start_spec_str("Python"));

28. Write a JavaScript program to check if two given integer values are in the range 50..99 (inclusive). Return true if either of them are in the said range.

function check_numbers(x, y)
{
if ((x >= 50 && x <= 99) || (y >= 50 && y <= 99))
{
return true;
}
else
{
return false;
}
}

console.log(check_numbers(12, 101));
console.log(check_numbers(52, 80));
console.log(check_numbers(15, 99));

29. Write a JavaScript program to check if three given integer values are in the range 50..99 (inclusive). Return true if one or more of them are in the said range.

function check_three_nums(x, y, z)
{
return (x >= 50 && x <= 99) || (y >= 50 && y <= 99) || (z >= 50 && z <= 99);
}

console.log(check_three_nums(50, 90, 99));
console.log(check_three_nums(5, 9, 199));
console.log(check_three_nums(65, 89, 199));
console.log(check_three_nums(65, 9, 199));

30. Write a JavaScript program to check if a string "Script" presents at 5th (index 4) position in a given string, if "Script" presents in the string return the string without "Script" otherwise return the original one.


function check_script(str)
{
if (str.length < 6) {
return str;
}
let result_str = str;

if (str.substring(10, 4) == 'Script')
{

result_str = str.substring(0, 4) + str.substring(10,str.length);

}
return result_str;
}

console.log(check_script("JavaScript"));
console.log(check_script("CoffeeScript"));