Finding the biggest of 3 numbers using if...else

Program:

#include<stdio.h>
#include<conio.h>
void main()
{
    int a, b, c;
    clrscr();
    printf("Enter three numbers : ");
    scanf("%d %d %d", &a, &b, &c);
    if(a > b)
    {
        if(a > c)
        printf("\n%d is the biggest number", a);
        else
        printf("\n%d is the biggest number", c);
    }
    else
    {
        if(c > b)
        printf("\n%d is the biggest number", c);
        else
        printf("\n%d is the biggest number", b);
    }
    getch();
}

Output:

Enter three numbers : 10 20 30
30 is the biggest number