C语言:从键盘输入一个数,然后在一个整型一维数组a[20]中,用折半查找法...答:include <stdio.h> int main(){ int a[20]={16,15,18,1,12,57,10,9,38,7,6,5,4,32,2,1,,17,25,28,68};int l=0,h=14,x,m;printf("输入数字:");scanf("%d",&x);while(l<h){ m=(l+h)/2;if(x==a[m]) break;if(x>a[m])h=m;else l=m;if ((l==h) ...