四则运算 来自 http://www.cnblogs.com/ys1101/p/4368103.html
#include<stdio.h> #include<math.h> #include<windows.h> int right=0; int wrong=0; void add() { int a,b,c,d; a=rand()%100; b=rand()%100; printf("请回答:\n\t\t %d + %d = ",a,b); scanf("%d",&c); if(a+b==c) { printf("回答正确!\n"); right++; } else { printf("回答错误!\n"); wrong++; } } void minu() { int a,b,c; a=rand()%100; b=rand()%100; printf("请回答:\n\t\t %d - %d = ",a,b); scanf("%d",&c); if(a-b==c) { printf("回答正确!\n"); right++; } else { printf("回答错误!\n"); wrong++; } } void mul() { int a,b,c; a=rand()%100; b=rand()%100; printf("请回答:\n\t\t %d * %d = ",a,b); scanf("%d",&c); if(a*b==c) { printf("回答正确!\n"); right++; } else { printf("回答错误!\n"); wrong++; } } void di() { int a,b,c; a=rand()%100; b=rand()%100; printf("请回答:\n\t\t %d / %d = ",a,b); scanf("%d",&c); if(a/b==c) { printf("回答正确!\n"); right++; } else { printf("回答错误!\n"); wrong++; } } void main() { int choise; int con=0; printf("\n\t\t\t欢迎进入小学简易四则运算\n\n"); while(1) { printf("请选择:\n"); printf("\t\t\t 加法运算(请输入1)\n"); printf("\t\t\t 减法运算(请输入2)\n"); printf("\t\t\t 乘法运算(请输入3)\n"); printf("\t\t\t 除法运算(请输入4)\n"); printf("\t\t\t 退出运算(请输入5)\n"); if(con==0) scanf("%d",&choise); switch(choise) { case 1: add(); break; case 2: minu(); break; case 3: mul(); break; case 4: di(); break; case 5: return; } printf("\n\t\t\t继续运算?(请输入1)\n"); printf("\n\t\t\t重新选择?(请输入2)\n"); printf("\n\t\t\t退出运算?(请输入3)\n"); scanf("%d",&con); if(con==1) con=1; else if(con==2) con=0; else if(con==3) break; else printf("抱歉!,你输入的指令有误!请重新输入!\n"); } printf("您总共完成了 %d 道题\n正确 %d 道\n错误 %d 道\n",right+wrong,right,wrong); }