第四次作业：个人项目-小学四则运算 “软件”之初版

 1 int random(double start, double end)
 2 {
 3     return (int)(start+(end-start)*rand()/(RAND_MAX+ 1.0));
 4 }
 5 int result(int num1,int num2,char op)
 6 {
 7     int Result;
 8     switch(op)
 9     {
10     case ‘+‘:
11         Result=num1+num2;
12         break;
13     case ‘-‘:
14         Result=num1-num2;
15         break;
16     case ‘*‘:
17         Result=num1*num2;
18         break;
19     case ‘/‘:
20         Result=num1/num2;
21         break;
22     default:
23         printf("运算符错误！\n");
24     }
25     return Result;
26 }
27 int yunsuan(int Result,int num3,char op1)
28 {
29     int Result1;
30     switch(op1){
31     case ‘+‘:
32         Result1=Result+num3;
33         break;
34     case ‘-‘:
35         Result1=Result-num3;
36         break;
37     case ‘*‘:
38         Result1=Result*num3;
39         break;
40     case ‘/‘:
41         Result1=Result/num3;
42         break;
43     default:
44         printf("运算符错误！\n");
45     }
46     return Result1;
47 }