To find the largest number in array using function

In the last program I have made the video of engineering drawing. Now lets move towards something new.
In this page I have written the program to find the largest number in an array using function. For this I have supposed the maximum number at first is of  zero position then I have used  the concept of replacing values. I have used argument with return values. For more idea have a look.

	#include<stdio.h>
	#include<conio.h>
	int m,a,b,n,max;
	int num[100];
	int largest(int num[]);
	int main()
	{
	printf("how many numbers you want to check\n");
	scanf("%d",&n);
	for(a=0;a<n;a++)
	{
	printf("enter the number %d\n",a+1);
	scanf("%d",&num[a]);
	}
	m=largest(num);
	printf("the largest num is %d",m);
	getch();
	}
	int largest(int num[100])
	{
	int help,max=num[0];
	for(a=0;a<n;a++)
	{
	if(max<num[a])
	max=num[a];
	}
	return max;
	}

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