Factorial

#include<stdio.h>
void main(){
	int num,i,fact=1;
	printf("Enter any number:\n");
	scanf("%d",&num);
	for(i=num;i>1;i--){
		fact=fact*i;
	}
	printf("The factorial is %d\n",fact);
}

Kaprekar Number

#include<stdio.h>
void main(){
	int num;
	printf("Enter any number:\n");
	scanf("%d",&num);
	if(num%9==1){
		printf("The number is Kaprekar.\n");
	}else{
		printf("The number is not Kaprekar.\n");
	}
}

Prime Number

#include<stdio.h>
#include<math.h>
void main(){
	int num,limit,i,flag=1;
	printf("Enter any number:\n");
	scanf("%d",&num);
	if(num<2){
		flag=0;
	}else if(num==2){
		flag=1;
	}else if(num%2==0){
		flag=0;
	}else{
		limit=sqrt(num);
		for(i=3;i<=limit;i+=2){
			if(num%i==0){
				flag=0;
				break;
			}
		}
	}
	if(flag){
		printf("The number is Prime.\n");
	}else{
		printf("The number is not Prime.\n");
	}
}

Armstrong Number

#include<stdio.h>
#include<math.h>
void main(){
	int num,temp,sum=0;
	printf("Enter any number:\n");
	scanf("%d",&num);
	for(temp=num;temp>0;temp/=10){
		sum+=pow(temp%10,3);
	}
	if(num==sum){
		printf("The number is Armstrong.\n");
	}else{
		printf("The number is not Armstrong.\n");
	}
}

Palindrome Number

#include<stdio.h>
void main(){
	int num,temp,rev=0;
	printf("Enter any number:\n");
	scanf("%d",&num);
	for(temp=num;temp>0;temp/=10){
		rev=(rev*10)+(temp%10);
	}
	if(rev==num){
		printf("The number is Palindrome.\n");
	}else{
		printf("The number is not Palindrome.\n");
	}
}

Even or Odd

#include<stdio.h>
void main(){
	int num;
	printf("Enter any number:\n");
	scanf("%d",&num);
	if(num%2==0){
		printf("Number is Even\n");
	}else{
		printf("Number is Odd\n");
	}
}

Leap Year

#include<stdio.h>
void main(){
	int year,div;
	printf("Enter the year:\n");
	scanf("%d",&year);
	if(year%100==0){
		div=400;
	}else{
		div=4;
	}
	if(year%div==0){
		printf("Year is leap.\n");
	}else{
		printf("Year is not leap.\n");
	}
}