Use of switch statement

Switch statement is mainly used
if we have to make multiple descision. I have given one example of using switch statement to make clear about the use of switch statement.
The main source code of the program is given below:

	#include<stdio.h>
	#include<conio.h>
	int main()
	{
	int n;
	float a,b, sum,diff,product;
	top:
	printf("enter your choice:\n");
	printf("1.addition,2.subtraction,3.product\n");
	scanf("%d",&n);
	switch(n);
	case 1:
	printf("enter any two numbers:\n");
	scanf("%f%f"&a,&b);
	sum=a+b;
	printf("the sum is %f:",sum);
	break;
	case 2:
	printf("enter any two numbers:\n");
	scanf("%f%f"&a,&b);
	diff=a-b;
	printf("the difference is %f:",diff);
	break;
	case 2:
	printf("enter any two numbers:\n");
	scanf("%f%f"&a,&b);
	product=a*b;
	printf("the product is %f:",product);
	break;
	default:
	printf("enter number between 1 and 3:");
	goto top;
	getch();
	return 0;
	}

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