四则运算
代码来源：http://wenwen.sogou.com/z/q710937394.htm
新增功能：可以自行选择继续出题还是退出程序，加入了一个简单的多运算符运算。
语言：C语言
编译环境：VC++6.0
运行环境：Windows
BUG：暂未发现BUG
GitHub地址：https://github.com/Devilingg/-/blob/master/%E8%BF%90%E7%AE%97
1 #include<stdio.h> 2 #include<time.h> 3 #include<stdlib.h> 4 #include<conio.h> 5 6 int main(){ 7 int a,b,c,d,n; 8 char m; 9 start:srand(time(0)); 10 a=rand()%100; 11 b=rand()%100; 12 n=rand()%100; 13 c=rand()%4; 14 switch(c){ 15 case 0:printf("%d+%d=",a,b);break; 16 case 1:printf("%d-%d=",a,b);break; 17 case 2:printf("%d*%d=",a,b);break; 18 case 3:printf("%d+%d-%d=",a,b,n);break; 19 case 4:if(b==0){ 20 21 while(b==0){ 22 a=rand()%100; 23 b=rand()%100; 24 printf("%d/%d=",a,b); 25 } 26 } 27 else 28 printf("%d/%d=",a,b); 29 break; 30 } 31 scanf("%d",&d); 32 getchar(); 33 switch(c){ 34 case 0:if(d==a+b) 35 printf("You are right\n"); 36 else 37 printf("You are wrong\n"); 38 break; 39 case 1:if(d==a-b) 40 printf("You are right\n"); 41 else 42 printf("You are wrong\n"); 43 break; 44 case 2:if(d==a*b) 45 printf("You are right\n"); 46 else 47 printf("You are wrong\n"); 48 break; 49 case 3:if(d==a+b-n) 50 printf("You are right\n"); 51 else 52 printf("You are wrong\n"); 53 break; 54 case 4:if(d==a/b) 55 printf("You are right\n"); 56 else 57 printf("You are wrong\n"); 58 break; 59 60 } 61 printf("继续请输入Y，退出请输入任意字符。"); 62 scanf("%c",&m); 63 getchar(); 64 if(m=='Y') 65 goto start; 66 67 return 0; 68 }
