C Programming Code on Series,Leap year,LCM

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*** To Solve 1+2+3+.......+n write C prog code using different Loop.
USING FOR LOOP---------
#include
main()
{
    int n,k,sum=0;
    printf("Enter your number ");
    scanf("%d",&n);
    for(k=1;k<=n;k=k+1)
    {
        sum=sum+k;
    }
    printf("The result is %d",sum);

}

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*** To Solve 1+2+3+.......+100 write C prog code using different Loop.
#include
 main()
 {
      int k=1,sum=0;

      for(k=1;k<=100;k=k+1)
      {
          sum=sum+k;

      }

      printf("the result is %d",sum);
 }

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*** Write C Prog Code To Find the LCM of two Integers.
 #include
 main()
 {
     int a,b,x;
     printf("Enter the 1st number ");
     scanf("%d",&a);
     printf("Enter the 2nd number ");
     scanf("%d",&b);
     x=(a>b)?a:b;
     tt:if(x%a==0&&x%b==0)
        printf("The lcm is %d",x);
     else
        {
            x=x+1;
        goto tt;
     }
 }

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*** Write C Prog Code To Find the LEAP YEAR.
 #include
     main()
     {
         int year;
         printf("Enter year ");
         scanf("%d",&year);
         if(year%400==0||(year%100!=0&&year%4==0))
            printf("%d is the leap year",year);
         else
            printf("%d is not the leap year",year);
     }