How to find greatest of 2 numbers using function with arguments?

CODE

How to find greatest of 2 numbers using function with arguments?

//Write a program to find greatest of 2 numbers using function with arguments…

int main()

{

    int a,b;

    printf("\n enter 2 numbers:");

    scanf("%d%d",&a,&b);

    void gr(int a,int b);

    gr(a,b);

}

void gr(int a,int b)

{

    if(a>b)

        printf("\n %d is greater",a);

    else if(b>a)

        printf("\n %d is greater",b);

    else

        printf("\n Both are same");

}

Output:

enter 2 numbers:45

78

 78 is greater