C Program to Find Highest and Second Highest Number

#include<stdio.h>
void main()
{
int i, n, a, b, num;
a=0;
b=0;
printf("Enter the Maximum amount of Numbers :: ");
scanf("%d", &n);
printf("nn");
   for(i=0; i<n; i++)
   {
     printf("nEnter the Number :: ");
     scanf("%d", &num);
     if (num > a)
     {
      	 b = a;
      	 a = num;
     }
else if (num > b)
b = num;
} printf("nn Second Highest Number is :: %d",b);
}

#include<stdio.h>
main()
{
double num;
int i;
double fbig,secbig,thirdbig=0;
for (i=0;i<6;i++)
{
printf("Enter a Numbern");
scanf("%lf",&num);

if(num>fbig)
{
thirdbig=secbig;
secbig=fbig;
fbig=num;
}
else
secbig=num;
}
printf("The Biggest Number is %lf n The Second Biggest Numer is %lf n The Third Biggest NUmber is %lf n",fbig,secbig,thirdbig);
}