C语言 求玩梯形面积后,还要输入三个数,求大神把输入,这是多余的,怎么取...答:include<stdlib.h> void main(){ char id[19];int i;float t,e,f,g,s;int x,y,z,w;for(i=1;i<=3;i++){ printf("请输入密码:");gets(id);if(strcmp(id,"123")==0)break;} if(i<=3){ while(1){ printf("\n1.三个数从小到大排序输出\n2.求梯形面积\n0.退出\n "...