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"));

31. Write a JavaScript program to find the largest of three given integers.

function max_of_three(x, y, z)
{
max_val = 0;
if (x > y)
{
max_val = x;
} else
{
max_val = y;
}
if (z > max_val)
{
max_val = z;
}
return max_val;
}

console.log(max_of_three(1,0,1));
console.log(max_of_three(0,-10,-20));
console.log(max_of_three(1000,510,440));

32. Write a JavaScript program to find a value which is nearest to 100 from two different given integer values.

function near_100(x, y) {
if (x != y)
{
x1 = Math.abs(x - 100);
y1 = Math.abs(y - 100);

if (x1 < y1)
{
return x;
}
if (y1 < x1)
{
return y;
}
return 0;
}
else
return false;
}

console.log(near_100(90, 89));
console.log(near_100(-90, -89));
console.log(near_100(90, 90));

33. 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));

34. Write a JavaScript program to find the larger number from the two given positive integers, the two numbers are in the range 40..60 inclusive.

function max_townums_range(x, y){
if( (x >= 40) && (x <= 60) && (y >= 40 && y <= 60) ){
if(x === y){
return "Numbers are the same";
}else if (x > y){
return x;
}else{
return y;
}
}else{
return "Numbers don't fit in range";
}
}

console.log(max_townums_range(45, 60));
console.log(max_townums_range(25, 60));
console.log(max_townums_range(45, 80));

35. Write a JavaScript program to check a given string contains 2 to 4 numbers of a specified character.


function check_char(str, char)
{
ctr = 0;
for (let i = 0; i < str.length; i++)
{
if (str.charAt(i) == char) {
ctr++;
}
}
return (ctr >= 2 && ctr <= 4);
}

console.log(check_char("Python", "y"));
console.log(check_char("JavaScript", "a"));
console.log(check_char("Console", "o"));

36. 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));

37. 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"));

38. Write a JavaScript program to check the total marks of a student in various examinations. The student will get A+ grade if the total marks are in the range 89..100 inclusive, if the examination is "Final-exam." the student will get A+ grade where total marks must be greater than or equal to 90. Return true if the student get A+ grade or false otherwise.

function exam_status(totmarks,is_exam)
{
if (is_exam) {
return totmarks >= 90;
}
return (totmarks >= 89 && totmarks <= 100);
}

console.log(exam_status("78", " "));
console.log(exam_status("89", "true "));
console.log(exam_status("99", "true "));

@javascript_Programming

39. Write a JavaScript program to compute the sum of the two given integers, If the sum is in the range 50..80 return 65 other wise return 80

function sortaSum(x, y)
{
const sum_nums = x + y;
if (sum_nums >= 50 && sum_nums <= 80) {
return 65;
}
return 80;
}

console.log(sortaSum(30,20));
console.log(sortaSum(90,80));

40. Write a JavaScript program to check from two given integers whether one of them is 8 or their sum or difference is 8.

function check8(x, y) {
if (x == 8 || y == 8) {
return true;
}

if (x + y == 8 || Math.abs(x - y) == 8)
{
return true;
}

return false;
}

console.log(check8(7, 8));
console.log(check8(16, 8));
console.log(check8(24, 32));
console.log(check8(17, 18));

42. Write a JavaScript program to check whether three given numbers are increasing in strict mode or in soft mode.

function number_order(x, y, z ) {
if ( y > x && z > y)
{
return "strict mode";
}
else if(z > y)
return "Soft mode";
else
return "Undefinded";
}

console.log(number_order(10,15,31));
console.log(number_order(24,22,31));
console.log(number_order(50,21,15));

43. Write a JavaScript program to check from three given numbers (non negative integers) that two or all of them have the same rightmost digit.

function same_last_digit(p, q, r) {
return (p % 10 === q % 10) ||
(p % 10 === r % 10) ||
(q % 10 === r % 10);

}

console.log(same_last_digit(22,32,42));
console.log(same_last_digit(102,302,2));
console.log(same_last_digit(20,22,45));

44. Write a JavaScript program to check from three given integers that whether a number is greater than or equal to 20 and less than one of the others.

function lessby20_others(x, y, z)
{
return (x >= 20 && (x < y || x < z)) ||
(y >= 20 && (y < x || y < z)) ||
(z >= 20 && (z < y || z < x));
}
console.log(lessby20_others(23, 45, 10));
console.log(lessby20_others(23, 23, 10));
console.log(lessby20_others(21, 66, 75));