What's the process behind the first and second program outputting 24 and 5 respectively?

Question

//first program
function p(m) {
if (m==1) {
return m;
} else {
return m * p(m-1);
}
}
alert(p(4));

//second program
var x=1, y=1, z=0;
do {
z=x+y;
}
while(++x<=1 && y++>=1);
z+=x+y;
document.write(z)

Answer 1

as we already know, the do while function is executed at least once. When the function is invoked in the variable z, it writes 1 + 1 and the variable x is incremented by ++x. z + = x + y = 2 + 2 + 1 = 5.

Answer 2

The first program is recursion. The function calls itself up to the base case which is m = 1. This is factorial. In function, you pass 4 as an argument. it works in that order. 4! = 4 * 3 * 2 * 1.

Answer 3

the first one simply returns the factorial of m --> 4! = 24

Answer 4

unlike a regular while loop a do while loop executes atleast once even if the condition in the while loop is false

Answer 5

Have you ever heard about recursion?

Answer 6

Ahmadjon Boboev, but in the second program, the "z+=x+y" shouldn't have been executed because in the while loop, ++x is not less than or equal to 1

Answer 7

Mind To Machine 💻🕆 I don't understand

Answer 8

have you ever heard the term factorial?