I was bored and sorted out some simple exercises about loops. I hope it will be helpful to those who are just starting to learn JS. 1. Print the number and sum of all multiples of 7 between 1 and 100 var sum=0; var n=0; for(var i=1;i<=100;i++){ if(i%7==0){ sum+=i; ++n; } } console.log("The number is: "+n+", the sum is: "+sum); Running results: 2. Assuming the annual interest rate of investment is 5%, how many years will it take to increase from 1,000 to 5,000? var money=1000; var i=0; while(money<=5000){ money=money*1.05; ++i; } console.log("A total of "+i+" years is required"); Running results: 3. Find the daffodil number between 100 and 1000. A daffodil number is a 3-digit number where the sum of the 3 powers of each digit is equal to itself. For example, 1^3 + 5^3 + 3^3 = 153 for(var i=100;i<1000;i++){ //Get the number in the hundreds place var a=parseInt(i/100); //Get the number in the tens place var b=parseInt(i/10%10); // Extract the number in the ones place var c=parseInt(i%10); if(a*a*a+b*b*b+c*c*c==i){ console.log(i); } } The tens digit can also be obtained using var b=paraseInt((i-bai*100)/10). Running results: 4. Print the sum of all odd numbers between 1-100. All numbers that are not divisible by 2 are odd numbers. var sum=0; for(var i=1;i<=100;i++){ if(i%2==0){ sum+=i; } } console.log("The sum of odd numbers is: "+sum); Running results: 5. Determine the prime numbers between 2-100. A prime number is a natural number greater than 1 that cannot be divided by any other natural numbers except 1 and itself. for(var i=2;i<=100;i++){ var flag = true; //If the loop reaches i, there will be repeated factors for(var j=2;j<=Math.sqrt(i);j++){ if(i%j==0){ flag=false; break; } } if(flag==true){ document.write(i+" "); } } Running results: 6. Printing triangle From little to more for(var i=1;i<=5;i++){ for(var j=1;j<=i;j++){ document.write("*"); } document.write("<br/>"); } From more to less for(var i=0;i<5;i++){ for(var j=0;j<5-i;j++){ document.write("*"); } document.write("<br/>"); } 7. Print the multiplication table for(var i=1;i<=9;i++){ for(var j=1;j<=i;j++){ document.write(i+"*"+j+"="+i*j+" ") } document.write("<br/>");//line break} Running results: This is the end of this article about javascript examples explaining the use of loops. For more relevant javascript loop content, please search for previous articles on 123WORDPRESS.COM or continue to browse the following related articles. I hope everyone will support 123WORDPRESS.COM in the future! You may also be interested in:
|
<<: Docker implements container port binding local port
>>: IE8 provides a good experience: Activities
1. Query speed of two query engines (myIsam engin...
On a whim, I wrote a case study of a small ball b...
Use JS timer to make an element to make a method ...
Preface When we were writing the horse, I guess e...
This article uses an example to illustrate the us...
Table of contents Understanding SQL Understanding...
Table of contents Make scrolling smoother BetterS...
Table of contents Preface Computed properties Int...
Preface As a basic data structure, arrays and obj...
In this section, the author describes the special...
Table of contents 1. Open source warehouse manage...
There are two ways to install nodejs in linux. On...
This article shares the specific code of JavaScri...
Preface Excel is powerful and widely used. With t...
This article mainly introduces how to use the Rea...