## Leap Year In JavaScript

### Leap Year

let year = 2100;
// Define variable year and initialize value
{
if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {
// three conditions to find leap year
// The number which is divided by 4 or 400 is a leap year.
// The number that divided by 100 is not zero is leap year

console.log(year + " is leap year");
} else {
console.log(year + " is not leap year");
}
}

### Output

2100 is not leap year

## How To Define Area in Switch Case in JavaScript

### Define Area in switch case

let area = "circle";
let PI = 3.142,
l = 9,
b = 7,
r = 6;
switch (area) {
case "circle":
console.log("Area of the circle is : " + PI * r ** 2);
break;
case "triangle":
console.log("Area of the triangle is : " + (l * b) / 2);
break;
case "rectangle":
break;
console.log("Area of the rectangle is : " + l * b);
default:
}

### Output

Area of the circle is : 113.112

## How to use prime number is not prime in c language

### program to use prime number is not prime in c language

#include <stdio.h>
#include <math.h>
int main()
{
int i, n;
printf("Enter a number : ");
scanf("%d", &n);
for (i = 2; i <= sqrt(n); i++)
{
if (n % i == 0)
{
break;
}
printf("i=%d\n", i);
printf("n=%d\n", n);
}
if (i > sqrt(n))
{
printf("%d is prime\n", n);
}
else
{
printf("%d is not prime\n", n);
}
return 0;
}

### output

Enter a number : 7
i=2
n=7
7 is prime

### output

Enter a number : 4
4 is not prime

## How to use sum and average in c language

### program to use sum and average in c language

#include<stdio.h>
int main()
{
int i=1,n,sum=0;
float avg;
printf("Enter 10 positive numbers : \n");
while(i<=10)
{
printf("Enter number %d : ",i);
scanf("%d",&n);
if(n<0)
{
printf("enter only positive numbers\n");
continue;
}
sum+=n;
i++;
}
avg=sum/10.0;
printf("sum=%d avg=%f\n",sum,avg);
return 0;
}

### output

Enter 10 positive numbers :
Enter number 1 : 2
Enter number 2 : 4
Enter number 3 : 5
Enter number 4 : 6
Enter number 5 : 9
Enter number 6 : 4
Enter number 7 : 3
Enter number 8 : 1
Enter number 9 : 8
Enter number 10 : 5
sum=47 avg=4.700000

## How to use factorial number in C Language

### program to use factorial number in C Language

#include <stdio.h>
int main()
{
int n, num;
long fact = 1;
printf("enter a number : ");
scanf("%d", &n);
num = n;
if (n < 0)
{
printf("no factorial of negative number\n");
}
else
{
while (n > 1)
{
fact *= n;
n--;
}
printf("factorial of %d=%d\n", num, fact);
}
return 0;
}

### output

enter a number : 4
factorial of 4 = 24

## How to use generate in c language

### program to use generate in c language

#include<stdio.h>
int main()
{
long x,y,z;
int i,n;
x=0;
y=1;
printf("Enter the number of terms : ");
scanf("%d",&n);
printf("%1d ",y);
for(i=1; i<n; i++)
{
z=x+y;
printf("%1d ",z);
x=y;
y=z;
}
printf("\n");
return 0;
}

### output

Enter the number of terms : 4
1 1 2 3

## How to use sum of this series in c language

### program to use sum of this series in c language

#include<stdio.h>
int main()
{
int i,n,sum=0,term=1;
printf("Enter number of terms : ");
scanf("%d",&n);
for(i=1; i<=n; i++)
{
sum+=term;
term = term+i;
}
printf("the sum of series upto %d term is %d\n",n,sum);
return 0;
}

### output

Enter number of terms : 3
the sum of series upto 3 term is 7

## How to use multiply operator in c language

### program to use multiply operator in c language

#include<stdio.h>
int main()
{
int a,b,i;
int result=0;
printf("Enter two numbers to be multiplied : ");
scanf("%d%d",&a,&b);
for(i=1; i<=b; i++)
{
result=result+a;
printf("%d * %d = %d\n",a,b,result);
}
return 0;
}

### output

Enter two numbers to be multiplied : 12
3
12 * 3 = 12
12 * 3 = 24
12 * 3 = 36