C 语言实现的一个随机加减法运算计算器

#include<iostream> #include<fstream> #include<stdio.h> #include<time.h> using namespace std; typedef struct student { char name[20]; //学生姓名 int score; //学生成绩 }student; ///将学生的成绩写入到student文件中 void Set_student(struct student s) { FILE *fp=NULL; // cout<<s.name<<" "<<s.score<<endl; if((fp=fopen("D:\\stu.txt","a+"))==NULL) { cout<<"学生信息文件打开失败"<<endl; exit(0); } //fwrite(&s,sizeof(struct student_type),1,fp); fprintf(fp,"%s %d",s.name,s.score); fclose(fp); } //将所有学生的成绩进行排序 void Std_sort() { FILE *fp=NULL; struct student s[100],std_temp; int i,j,num,k; if((fp=fopen("D:\\stu.txt","r"))==NULL) { cout<<"用户信息文件打开失败"<<endl; exit(0); } i=0; while(!feof(fp)) //读文件 { fscanf(fp,"%s %d",&s[i].name,&s[i].score); i++; } num=i; for(i=0;i<num;i++) //这里利用冒泡排序进行排序 { k=i; for(j=i;j<num;j++) { if(s[k].score<s[j].score) { k=j; } } if(k!=i) //交换std[i]和std[k]的值 { strcpy(std_temp.name,s[i].name); std_temp.score=s[i].score; strcpy(s[i].name,s[k].name); s[i].score=s[k].score; strcpy(s[k].name,std_temp.name); s[k].score=std_temp.score; } } for(i=0;i<num;i++) { cout<<s[i].name<<" "<<s[i].score<<endl; } fclose(fp); system("pause"); } void My_find() { FILE *fp=NULL; struct student s[100]; int i,num,k; char str[20]; cout<<"请输入你要查找学生的姓名"<<endl; cin>>str; if((fp=fopen("D:\\stu.txt","r"))==NULL) { cout<<"用户信息文件打开失败"<<endl; exit(0); } i=0; while(!feof(fp)) //读文件 { fscanf(fp,"%s %d",&s[i].name,&s[i].score); i++; } num=i; k=0; for(i=0;i<num;i++) { if(strcmp(s[i].name,str)==0) { cout<<s[i].name<<" "<<s[i].score<<endl; k=1; } } if(k==0) { cout<<"未找到相关学生的信息"<<endl; } fclose(fp); system("pause"); } int My_menu() { int ch; cout<<"*******WELCOME MY CALCULATOR********"<<endl; cout<<"1.显示所有测试者的个人信息"<<endl; cout<<"2.进入测试"<<endl; cout<<"3.查找某个学生的成绩"<<endl; cout<<"4.离开"<<endl; cin>>ch; while(ch<1||ch>4) { cout<<"1.显示所有测试者的个人信息"<<endl; cout<<"2.进入测试"<<endl; cout<<"3.查找某个学生的成绩"<<endl; cout<<"4.离开"<<endl; cin>>ch; } return ch; } void My_calc() { int i,j,plus,k; int x,y,z; int ca; struct student test_std; char score[20]; cout<<"Input you name"<<endl; cin>>test_std.name; test_std.score=0; srand((unsigned)time(NULL)); for(i=0;i<10;i++) { plus=rand()%10+1; if(plus%2==1) { x=rand()%24+1; //生成随机数 y=rand()%24+1; for(j=0;j<3;j++) //具有三次回答问题的机会 { cout<<"第"<<j+1<<"次解答,请输入你的答案"<<" "; cout<<x<<"+"<<y<<"=?"<<endl; cin>>score; k=0; z=0; while(score[k]!='\0') { z=z*10+score[k]-'0'; k++; } if(z==x+y) { cout<<"Congratulation"<<endl; if(j==0) { test_std.score=test_std.score+10; } else if(j==1) { test_std.score=test_std.score+7; } else { test_std.score=test_std.score+5; } break; } else { if(j==2) { cout<<"Sorry, this problem is not right."<<endl; } else { cout<<"What a pity，you have"<<2-j<<"chance"<<endl; } } }///end for j }//end if else { x=rand()%49+1; y=rand()%x+1; for(j=0;j<3;j++) { cout<<"第"<<j+1<<"次解答,请输入你的答案"<<" "; cout<<x<<"-"<<y<<"=?"<<endl; cin>>score; k=0; z=0; while(score[k]!='\0') { z=z*10+score[k]-'0'; k++; } if(z==x-y) { cout<<"Congratulation"<<endl; if(j==0) { test_std.score=test_std.score+10; } else if(j==1) { test_std.score=test_std.score+7; } else { test_std.score=test_std.score+5; } break; } else { if(j==2) { cout<<"Sorry, this problem is not right"<<endl; } else { cout<<"What a pity，you have"<<2-j<<"chance"<<endl; } //cout<<x<<"-"<<y<<"=?"<<endl; } }//end for j }//end else }//end for i ca=test_std.score/10; switch(ca) { case 10: cout<<test_std.name<<" score: "<<test_std.score<<" "<<"SMART"<<endl; break; case 9: cout<<test_std.name<<" score: "<<test_std.score<<" "<<"SMART"<<endl; break; case 8: cout<<test_std.name<<" score: "<<test_std.score<<" "<<"GOOD"<<endl; break; case 7: cout<<test_std.name<<" score: "<<test_std.score<<" "<<"OK"<<endl; break; case 6: cout<<test_std.name<<" score: "<<test_std.score<< " "<<"PASS"<<endl; break; default: cout<<test_std.name<<" score: "<<test_std.score<<" "<<"TRY　AGAIN"<<endl; break; } Set_student(test_std); system("pause"); } int main() { int choose=0; choose=My_menu(); while(choose!=4) { switch(choose) { case 1: Std_sort(); break; case 2: My_calc(); break; case 3: My_find(); break; case 4: return 0; break; } system("CLS"); choose=My_menu(); } return 0; }