软件工程第二次作业

*/

include<stdio.h>

include

include <stdlib.h>

include <time.h>

using namespace std;
//下面的代码根据算法笔记A1081 分数的四则运算修改而得
typedef long long ll;
int ans4,ans5,ans6;//带分数
ll gcd(ll a,ll b){//求最大公约数的辗转相除法递归写法
return b==0?a:gcd(b,a%b);
}
struct Fraction{//分数
ll up,down;//分子，分母
};
Fraction reduction(Fraction result){//分数的化简
if(result.down<0){
result.down=-result.down;
result.up=-result.up;

}
if(result.up==0){
    result.down=1;
}else{
    int d=gcd(abs(result.up),abs(result.down));
    result.down/=d;
    result.up/=d;
}
return result;

}
//分数的加减乘除
Fraction add(Fraction f1,Fraction f2){
Fraction result;
result.up=f1.upf2.down+f2.up f1.down;
result.down=f1.downf2.down;
return reduction(result);
}
Fraction minu(Fraction f1,Fraction f2){
Fraction result;
result.up=f1.upf2.down-f2.up f1.down;
result.down=f1.downf2.down;
return reduction(result);
}
Fraction multi(Fraction f1,Fraction f2){
Fraction result;
result.up=f1.upf2.up;
result.down=f1.downf2.down;
return reduction(result);
}
Fraction divide(Fraction f1,Fraction f2){
Fraction result;
result.up=f1.upf2.down;
result.down=f1.downf2.up;
return reduction(result);
}
//分数的输出
void showResult(Fraction r){
reduction(r);
if(r.down==1) printf("%lld ",r.up);
else if(abs(r.up)>r.down){//假分数
ans4=r.up/r.down;
ans5=abs(r.up)%r.down;
ans6=r.down;
}else{//真分数
ans4=0;
ans5=r.up;
ans6=r.down;
}
}
int ans;
int ans1;//除法所得结果整数部分
int ans2;//除法所得结果余数部分
double ans3;//(a/b/c类型的答案以3位小数展现)

int a1[100],b1[100],c1[100];//10以内整数
int main(){
Fraction sum,sum2,temp,sum3,sum4;
sum.up=0;
sum.down=1;
sum2.up=0;
sum2.down=1;
sum3.up=1;
sum3.down=1;
sum4.up=1;
sum4.down=1;
int right=0;
int wrong=0;
int grade;
int degree;//3 Difficulty level,respectively are difficult=3 medium=2 easy=1
int num;//题目数量
printf("请输入你的年级，一年级输入1，二年级输入2，三年级输入3，四年级输入4，五年级输入5 ");
scanf("%d",&grade);
printf("请选择难易程度，选择简单输入1，选择中等输入2，选择困难输入3 ");
scanf("%d",&degree);
switch(grade){
case 1:
if(degree==1){
printf("这是一年级运算简单程度 ");
printf("请输入题目数量 ");
scanf("%d",&num);
srand((unsigned) (time(NULL)));
for(int i=0;i<num;i++){

        int n1=rand()%10;
        int n2=rand()%10;
        if(n1>=n2){
            a1[i]=n1;
            b1[i]=n2;
        }
        else{
            a1[i]=n2;
            b1[i]=n1;
        }
        }
        for(int i=0;i<num/2;i++){
            printf(" %d + %d = 
",a1[i],b1[i]);
            scanf("%d",&ans);
                if(a1[i]+b1[i]==ans){
                printf("回答正确!
");
                right++;
                                     }
        else{
           printf("回答错误!
");
           wrong++;
             }
                                 }
        for(int i=num/2;i<num;i++){
            printf("
 %d -%d = ",a1[i],b1[i]);
            scanf("%d",&ans);
                if(a1[i]-b1[i]==ans){
                printf("回答正确!
");
                right++;
                                     }
        else{
           printf("回答错误!
");
           wrong++;
             }
                                 }
        printf("你一共答对了%d道题，答错了%d道题
",right,wrong);
    }
    
    else if(degree==2){printf("这是一年级运算中等程度");
    printf("请输入题目数量
");
        scanf("%d",&num);
        for(int i=0;i<num;){
        int n1=rand()%10;
        int n2=rand()%10;
        int n3=rand()%10;
        if(n1+n2-n3>=0&&n1+n3-n2>=0){
            a1[i]=n1;
            b1[i]=n2;
            c1[i]=n3;
            i++;}           
        }
        for(int i=0;i<num/2;i++){
            printf(" %d + %d -%d= 
",a1[i],b1[i],c1[i]);
            scanf("%d",&ans);
                if(a1[i]+b1[i]-c1[i]==ans){
                printf("回答正确!
");
                right++;}
        else{
           printf("回答错误!
");
           wrong++;}
                                 }
        for(int i=num/2;i<num;i++){
            printf("
 %d -%d +%d= ",a1[i],b1[i],c1[i]);
            scanf("%d",&ans);
                if(a1[i]-b