C语言用if else，switch，算折扣案例

#include <stdio.h>
int main()
{  
    //用if else算折扣
    int lucheng;
	int zhekou;
	puts("请输入路程");
	scanf("%d",&lucheng);
	if(lucheng<250){
		zhekou=0;
	}else if(lucheng>=250&&lucheng<500){
			zhekou=2;	
	}else if(lucheng>=500&&lucheng<1000){  
			zhekou=5;
	}else if(lucheng>=1000&&lucheng<2000){
			zhekou=8;
	}else if(lucheng>=2000&&lucheng<3000){
			zhekou=10;
	}else{
			zhekou=15;
	}
		//本次错误if里面的变量名用错。
		printf("折扣是:%.2f\n",(float)zhekou/100);
	return 0;
}




#include <stdio.h>
int main()
{   //用switch算折扣
	int lucheng;
	int zhekou;
	printf("请输入路程\n");
	scanf("%d",&lucheng);
	switch(lucheng/250){
		case 0:
		zhekou=0;
		break;
		
		case 1:
		zhekou=2;
		break;
		case 2:
		case 3:
		
		zhekou=5;
		break;
		case 4:
		case 5:
		case 6:
		case 7:
		
		zhekou=8;
		break;
		case 8:
		zhekou=10;
		break;
		
		case 9:
		case 10:
		case 11:
		zhekou=12;
		break;
		
		default:
		zhekou=15;
		
	}
	printf("折扣是：%.2f\n",(float)zhekou/100);
	return 0;
}