include<stdio.h> main(){ float sum; //sum费用和 int a,b;printf("input che xing.\n1.xia li\n2.fukang\n3.sangtala\n");//输入1 2 3,分别是3种车型 scanf("%d",&a);printf("input math b.\n");//输入公里数 scanf("%f",&b);switch(a) //选择语句 { case 1 : if...