C language: examples of logical operation and judgment selection structure

#include <stdio.h>
int main()
{
    
	int x , m , n;
	int sum = 0;
	printf(" Please enter a number (1-10000)");
	scanf("%d",&x);
	switch(x%2){
    
		case 0:{
    
			printf(" Please enter two integers ：");
			scanf("%d%d",&m,&n);
			sum = m+n;
			printf("%d and %d And for ：%d\n",m,n,sum);
			break;
		}
		default:{
    
			printf(" Please enter two integers ：");
			scanf("%d%d",&m,&n);
			sum = m-n;
			printf("%d and %d And for ：%d\n",m,n,sum);
			break;
		}
	}
	
	return 0;
}