...减、乘、除四则整数运算后结果等于24的表达式。答:include<stdio.h> double fun(double a1,double a2,int b){switch(b){case 0:return (a1+a2);case 1:return (a1-a2);case 2:return (a1*a2);case 3:return (a1/a2);} } void main(){int i,j,k,l,n,m,r,save[4];double num[4]={1,1,1,1},tem1,tem2,tem3,abc=1111;...