can anyone help me finish my program please. thank you

#include <stdio.h>
#include <math.h>
int main()

{
int product;
float product1 = 2.98; 
float product2 = 4.50;  
float product3 = 9.98; 
float product4 = 4.49; 
float product5 = 6.87;
float quantity = 1;
double unitprice;
float result;
double total;

printf( "Enter product number \n");
scanf("%f",&);

printf( "Enter quantity : \n" );
scanf("%f",&);

switch(product) {
case 1:
unitprice = 2.98;
break;
case 2:
unitprice = 4.50;
break;
case 3:
unitprice = 9.95;
break;
case 4:
unitprice = 3.89;
case 5:
unitprice = 9.98;
break;
default:



total = unitprice * quantity;
	printf( "total is:",total);
}
}

a mail order hopuse sells five different products whose retail prices are shown below
product number retail price
1-5 2.98,4.50,9.98,4.49,6.87
your program should use a switch statements to help determine the retail price for each product. your program shoulds also calculate and display the total retail value of all products sold last week.

i havent tried it yet caz i'm stuck here what shud i put after & so it can work?
printf( "Enter product number \n");
scanf("%f",&);

printf( "Enter quantity : \n" );
scanf("%f",&);

i havent tried it yet caz i'm stuck here what shud i put after & so it can work?
printf( "Enter product number \n");
scanf("%f",&);

printf( "Enter quantity : \n" );
scanf("%f",&);

int product;
scanf( "%d", &product );

int quantity;
scanf( "%d", &quantity );
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