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));

45. Write a JavaScript program to check two given integer values and return true if one of the number is 15 or if their sum or difference is 15.

function test_number(x, y) {
return (x === 15 || y === 15 || x + y === 15 || Math.abs(x - y) === 15);
}

console.log(test_number(15, 9));
console.log(test_number(25, 15));
console.log(test_number(7, 8));
console.log(test_number(25, 10));
console.log(test_number(5, 9));
console.log(test_number(7, 9));
console.log(test_number(9, 25));

46. Write a JavaScript program to check two given non-negative integers that whether one of the number (not both) is multiple of 7 or 11.

function valCheck (a, b) {
if (!((a % 7 == 0 || a % 11 == 0) && (b % 7 == 0 || b % 11 == 0))) {
return ((a % 7 == 0 || a % 11 == 0) || (b % 7 == 0 || b % 11 == 0));
}
else
return false;
}
console.log(valCheck(14, 21));
console.log(valCheck(14, 20));
console.log(valCheck(16, 20));

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