Greatest among three numbers using if

#include<stdio.h>

int main()

{

int a,b,c,max; 

printf("Enter three numbers:");

scanf("%d %d %d",&a,&b,&c);

max=a;

if (b>max)

max=b;

if(c>max)

max=c;

printf("Greatest  no. = %d .",max);

return 0;

}

Output :

Enter three numbers:7

5

6

Greatest  no. = 7