Leap Year Problem.....

1-A year is called leap year if it is divisible by 400
2-If year is not divisible by 400 as well as 100 but it is divisible by 4 then that year are also leap year.

To determine a year is leap year or not...


#include<stdio.h>
int main(){
    int year;

    printf("Enter any year: ");
    scanf("%d",&year);

    if(((year%4==0)&&(year%100!=0))||(year%400==0))
         printf("%d is a leap year",year);
    else
         printf("%d is not a leap year",year);
 
    return 0;
}

To find leap year in between a range of year....



#include<stdio.h>
int main(){
    int year;
    int min_year,max_year;

    printf("Enter the lowest year: ");
    scanf("%d",&min_year);

    printf("Enter the heighest year: ");
    scanf("%d",&max_year);

    printf("Leap years in given range are: ");
    for(year = min_year;year <= max_year; year++){
         if(((year%4==0)&&(year%100!=0))||(year%400==0))
             printf("%d ",year);
    }
 
    return 0;
}

Reverse a number using c

1-Simple method  of reversing an integer number with the help of while loop....

#include<stdio.h>

int main(){

    int num,r,reverse=0;

    printf("Enter any number: ");

    scanf("%d",&num);

    while(num){

         r=num%10;

         reverse=reverse*10+r;

         num=num/10;

    }

    printf("Reversed of number: %d",reverse);

    return 0;

}

2-With help of for loop....

#include<stdio.h>

int main(){

    int num,r,reverse=0;

    printf("Enter any number: ");

    scanf("%d",&num);

    for(;num!=0;num=num/10){

         r=num%10;

         reverse=reverse*10+r;

    }

    printf("Reversed of number: %d",reverse);

    return 0;

}

3-With help of recursive function....

#include<stdio.h>

int main(){

    int num,reverse;

    printf("Enter any number: ");

    scanf("%d",&num);

    reverse=rev(num);

    printf("Reverse of number: %d",reverse);

    return 0;

}

int rev(int num){

    static sum,r;

    if(num){

         r=num%10;

         sum=sum*10+r;

         rev(num/10);

    }

    else

         return 0;

    return sum;

}

4-And finally method for reversing a very large number which is beyond the range of int and long int....

#include<stdio.h>

#define MAX 1000

int main(){

    char num[MAX];

    int i=0,j,flag=0;

    printf("Enter any positive integer: ");

    scanf("%s",num);

    while(num[i]){

         if(num[i] < 48 || num[i] > 57){

             printf("Invalid integer number");

             return 0;

         }

         i++;

    }

    printf("Reverse: ");

    for(j=i-1;j>=0;j--)

         if(flag==0 &&  num[j] ==48){

         }

         else{

             printf("%c",num[j]);

             flag =1;

         }

    return 0;