I want to print the following star pattern using JavaScript:
*****
***
*
***
*****
And I am trying this code, where I am getting off a triangle:
for (i = 3; i >= 1; i--) {
/* Printing spaces */
for (j = 0; j <= 3 - i; j++) {
document.write(" ");
}
/* Printing stars */
k = 0;
while (k != (2 * i - 1)) {
document.write("*");
k++;
}
document.write("<br/>")
}
try this code
after i==1 create new pattern inside it
for (i = 3; i >= 1; i--) {
/* Printing spaces */
for (j = 0; j <= 3 - i; j++) {
document.write(" ");
}
/* Printing stars */
k = 0;
while (k != (2 * i - 1)) {
document.write("*");
k++;
}
document.write("<br/>")
if (i == 1) {
for (t = 2; t <= 3; t++) {
for (j = 0; j <= 3 - t; j++) {
document.write(" ");
}
/* Printing stars */
k = 0;
while (k != (2 * t - 1)) {
document.write("*");
k++;
}
document.write("<br/>")
}
}
}
Try this code:-
In this we use outer loop and inner loop.
var i, j;
//outer loop
for(i=1; i <= 5; i++)
{
//inner loop
for(j=1; j<=i; j++)
{
document.write('*');
}
document.write('<br/>');
}
Iteration:-
i j(Repeat)
1 1
2 2
3 3
4 4
5 5
const n = 5
for (var i = 0; i < n; i++) {
var star = '';
for (var j = 0; j < n - i; j++) {
star += ' ';
}
for (var k = 0; k < i; k++) {
star += '* ';
}
console.log(star);
}
for (var i = 0; i < n; i++) {
var star = '';
for (var b = 0; b < i; b++) {
star += ' ';
}
for (var a = 0; a < n - i; a++) {
star += '* ';
}
console.log(star);
}
Related
I'm trying to print a pyramid that has odd numbers for edges. For example output should be:
.......5
...3,4,3
1,2,3,2,1
(dots are here just to show formating)
I managed to write:
function p(n){
let string = "";
for (let i = 1; i <= n; i++) {
for (let j = 1; j <= n - i; j++) {
string += " " ;
}
for (let k = 1; k <= 2*i-1; k++) {
string += n-k +1;
}
string += "\n";
}
console.log(string);
}
p(5);
But I'm not sure how to continue to get wanted result
You can try it :
function p(n){
let string = ""
for (let i = 0; i <= n/2; i++) {
let k = n - 2 * i
for (let j =0; j < Math.floor(n/2)*2 + 1; j++) {
if(j < Math.floor(n/2) - i) {
string += " ";
}
if( j >= Math.floor(n/2) - i && j <= Math.floor(n/2) + i) {
string += k;
j < Math.floor(n/2) ? k++ : k--
}
if(j > Math.floor(n/2) + i ) {
string += " ";
}
}
string += "\n";
}
console.log(string);
}
p(7);
I am currently trying to solve the xmas tree problem, with internal tree-like shape.
issue is with internal spacing, it supposed to be like: 1, 5, 7, 9. Instead it is 1, 3, 4, 5. I do not know, how to increment s loop by 2 in each loop turn.
/*
*********
**** ****
*** ***
** **
* *
*********
*/
function drawTree(h) {
let n = h + 3;
for (var i = 1; i <= 1; i++) {
var temp = "";
for (var j = 1; j <= n; j++) {
temp = temp + "*";
}
console.log(temp);
}
for (var i = 0; i < h - 2; i++) {
var tree = '';
console.log("\n");
for (var k = 3; k <= h - i; k++) {
tree += "*";
};
tree += "s";
for (var k = 1; k <= i; k++) {
for (var k = 1; k <= i; k++) {
tree += "s";
};
tree += "s";
};
for (var k = 3; k <= h - i; k++) {
tree += "*";
};
console.log(tree);
};
console.log("\n");
let g = h + 3;
for (var i = 1; i <= 1; i++) {
var temp = "";
for (var j = 1; j <= g; j++) {
temp = temp + "*";
}
console.log(temp);
}
};
drawTree(6);
function drawTree(stars, rowLength) {
for (let row = 0; row < rowLength; row++) {
if (row === 0) {
console.log("*".repeat(stars));
} else if(row === rowLength - 1) {
console.log("*".repeat(stars));
} else {
let spaces = 2 * row - 1;
if (spaces > stars) {
spaces = stars;
}
let numStarsInRow = "*".repeat((stars - spaces) / 2);
console.log(numStarsInRow + " ".repeat(spaces) + numStarsInRow);
}
}
}
drawTree(9, 5)
You can implement this by nesting loops over the height and the width of the tree, noting that the output is a * whenever:
it's the first or last row; or
the current x position is less than or equal to the halfway point minus the row number; or
the current x position is greater than or equal to the halfway point plus the row number
For all other cases the output is a space. For example:
function drawTree(height) {
// compute the width of the tree from the height
let width = height % 2 ? height + 2 : height + 3;
// find the halfway point
let half = (width - 1) / 2;
for (let i = 0; i < height; i++) {
let l = '';
for (let j = 0; j < width; j++) {
if (i == 0 || // first row
i == height - 1 || // last row
j <= (half - i) || // left side
j >= (half + i) // right side
) {
l += '*';
}
else {
l += ' ';
}
}
console.log(l);
}
}
drawTree(6);
drawTree(5);
I want to create a pyramid number structure. Can anyone explain me how?
for (i = 1; i <= 5; i++) {
var k = ' ';
var myspace = '';
for (j = 0; j < i - 0; j++) {
k += i;
myspace += ' ';
}
console.log(myspace + k);
}
I want make it like this:
1
2 2
3 3 3
4 4 4 4
Try below code:
function createPyramid(rows) {
for (var i = 0; i < rows; i++) {
var output = '';
for (var j = 0; j < rows - i; j++) output += ' ';
for (var k = 0; k <= i; k++) output += (i + 1) + ' ';
console.log(output);
}
}
createPyramid(4);
Try below method.
var a;
var n = 5;
for (var i = 1; i <= n; i++) {
for (var j = 1; j <= i; j++) {
document.write(j + " ");
}
document.write("<br />");
}
<!DOCTYPE HTML>
<html>
<head>
<script>
var i, j, k = 1;
for (i = 3; i < 100; i++) {
for (j = 2; j < i; j++) {
if (i % j == 0) {
k = 0;
break
}
}
}
if (k == 1) {
alert(i);
}
</script>
</head>
<body>
</body>
</html>
I am trying to print prime nos in js from 2 to 100.However the code is not producing the desired result.Please help.Thanks in advance.
First you only need to check till j <= (i/2) in your for loop.
also your if(k==1) need to be inside the outer for loop
var i, j;
for (i = 3; i < 100; i++) {
var k = 1;
for (j = 2; j <= i / 2; j++) {
if (i % j == 0) {
prime = false;
k = 0;
break;
}
}
if (k == 1) {
console.log(i);
}
}
Im trying to solve problem #4 on project Euler,im using a simple for-loop to sift through each element of the array and "missing ) after for-loop control"
Code below
var palidrome = function (num) {
var numstr = (num).toString().split("");
var count = 0;
for (var i = 0, i2 = numstr.length - 1; i < numstr.length / 2 && i2 >= numstr.length / 2; i++, i2--) {
if (numstr[i] !== numstr[i2]) {
return 0;
} else {
if (count == 3) {
return numstr.join("");
}
}
count++;
}
};
for (var i = 999; i >= 100; i--) {
for (var j = 100; j = < i; j++) {
if (palidrome(i * j) !== 0) {
alert(palidrome(i * j));
break;
}
}
}
Thank you for the assistance,much appreciated.
In for loop you have error: j = < i must be j <= i
for (var i = 999; i >= 100; i--) {
for (var j = 100; j <= i; j++) {
if (palidrome(i * j) !== 0) {
alert(palidrome(i * j));
break;
}
}
}