Simple calculator using switch in c

calculator.c

#include<stdio.h>
void add(int a,int b)
{
	printf("\n %d+%d=%d",a,b,a+b);
	}
void sub(int a,int b)
{
	printf("\n %d-%d=%d",a,b,a-b);
	
}
void mult(int a,int b)
{
	
	printf("\n %d*%d=%d",a,b,a*b);
}
void div(int a,int b)
{
	printf("\n %d/%d=%d",a,b,a/b);
}
int main()
{
	int n,a,b;
	printf("\n enter first number");
	scanf("%d",&a);
	printf("\n enter second number");
	scanf("%d",&b);
	printf("\n enter a choice");
	printf("\n1:+\n2:-\n3:*\n4:/");
	scanf("%d",&n);
	switch(n)
	{
		case 1:
		add(a,b);
		break;
		case 2:
		sub(a,b);
		break;
		case 3:
		mult(a,b);
		break;
		case 4:
		div(a,b);
		default:
		printf("\n invalid choice");
		return 0;
	}
}