C语言——通过输入两个加数给学生出一道加法运算题，如果输入答案正确，则显示“Right!”， 否则提示重做，显示“Not correct! Try again!”，最多给三次机会， 如果三次仍未做对，

#include “stdafx.h” int add(int a,int b) { int answer; printf(“两数之和为：”); scanf_s("%d",&answer); if(a+b==answer) return 1; else return 0; }

int _tmain(int argc, _TCHAR* argv[]) { int a,b,i,c,n=3; printf(“请输入两个加数，中间用+连接：”); scanf_s("%d+%d",&a,&b); c=add(a,b); for(i=1;i<=n;i++) { if(c==1) { printf(“Right!\n”); break; } else { switch(i) { case 3:printf(“Not correct. You have tried three times! Test over!\n”);break; default:printf(“Not correct! Try again!\n”); } c=add(a,b); } } }