C Program to find greatest in 3 numbers

#include<stdio.h>
#include<conio.h>

void main()
{
int a,b,c;
clrscr();

printf("nEnter value of a, b & c: ");
scanf("%d %d %d",&a,&b,&c);

if((a>b)&&(a>c))
    printf("na is greatest");

if((b>c)&&(b>a))
    printf("nb is greatest");

if((c>a)&&(c>b))
    printf("nc is greatest");

getch();
}

Output :

Enter value for a,b & c : 15 17 21
c is greatest