2018年苏州大学837复试机试C/C++-编程知识

2018年苏州大学837复试机试C/C++

2018年苏州大学复试机试

要求

要求用C/C++编程；
对程序中必要的地方进行注释。
上机规则
1. 请在电脑桌面上新建一个文件夹文件夹名为考试姓名（中文）；
2. 考试完毕后，将所编写的文件放在上述文件中。

第一题（20分）

题目

按下式要求计算e的近似值，n=5由键盘输入。
e = 1+1/1! + 1/2! + 1/3! +…+1/n!

代码

#include <iostream>  
using namespace std;  double Factorial(int n);  int main() {  int n = 1;  double Sum = 0;  cout << "请输入n=" << endl;  cin >> n;  //计算和  for (int i = 0; i < n; ++i) {  Sum += Factorial(i + 1);  }  cout << "e的计算值为：" << Sum << endl;  return 0;  
}  //计算单个1/n!,返回数值  
double Factorial(int n){  double Ele = 1;  double Sum_Eone = 0;  for (int i = 0; i < n; ++i) {  Ele *= i + 1;  }  Sum_Eone = 1.0 / Ele;  return Sum_Eone;  
}

结果

第二题（30分）

题目

以下三个问题，要求用函数编写：
有一个班的学生，本学期学了四门课，从键盘输入该班各同学各门课的成绩，假设学生数为3。

求出每门课程的平均成绩
求出全班的平均成绩
求出课程最低分的学生和成绩。

代码

#include <iostream>  
#include <iomanip>  //用来精确浮点数位数，fixed << setprecision(2)，限定小数点后两位  using namespace std;  const int NUM_STUDENTS = 3;  
const int NUM_COURSES = 4;  // 函数声明  
void inputGrades(double grades[NUM_STUDENTS][NUM_COURSES]);  
void displayCourseAverages(double grades[NUM_STUDENTS][NUM_COURSES]);  
void displayClassAverage(double grades[NUM_STUDENTS][NUM_COURSES]);  
void findMinScoreStudent(double grades[NUM_STUDENTS][NUM_COURSES], int& minStudent);  
double calculateClassTotalScore(double grades[NUM_STUDENTS][NUM_COURSES], int studentIndex);  int main() {  double grades[NUM_STUDENTS][NUM_COURSES];  // 输入成绩  inputGrades(grades);  // 显示每门课程的平均成绩  displayCourseAverages(grades);  // 显示全班平均成绩  displayClassAverage(grades);  // 找到课程最低分的学生  int minStudent;  findMinScoreStudent(grades, minStudent);  // 显示结果  cout << "课程最低分的学生是学生 " << minStudent + 1 << "，成绩为：" << endl;  for (int j = 0; j < NUM_COURSES; ++j) {  cout << "课程 " << j + 1 << ": " << fixed << setprecision(2) << grades[minStudent][j] << endl;  }  cout << "总成绩: " << fixed << setprecision(2) << calculateClassTotalScore(grades, minStudent) << endl;  return 0;  
}  // 输入成绩  
void inputGrades(double grades[NUM_STUDENTS][NUM_COURSES]) {  cout << "请输入每位学生的四门课程成绩：" << endl;  for (int i = 0; i < NUM_STUDENTS; ++i) {  for (int j = 0; j < NUM_COURSES; ++j) {  cout << "学生 " << i + 1 << " 课程 " << j + 1 << " 成绩：";  cin >> grades[i][j];  }  }  
}  // 计算每门课程的平均成绩并显示  
void displayCourseAverages(double grades[NUM_STUDENTS][NUM_COURSES]) {  cout << "每门课程的平均成绩：" << endl;  for (int i = 0; i < NUM_COURSES; ++i) {  double courseAverage = 0;  for (int j = 0; j < NUM_STUDENTS; ++j) {  courseAverage += grades[j][i];  }  courseAverage /= NUM_STUDENTS;  cout << "课程 " << i + 1 << ": " << fixed << setprecision(2) << courseAverage << endl;  }  
}  // 计算全班平均成绩并显示  
void displayClassAverage(double grades[NUM_STUDENTS][NUM_COURSES]) {  double classAverage = 0;  for (int i = 0; i < NUM_STUDENTS; ++i) {  for (int j = 0; j < NUM_COURSES; ++j) {  classAverage += grades[i][j];  }  }  classAverage /= (NUM_STUDENTS * NUM_COURSES);  cout << "全班平均成绩: " << fixed << setprecision(2) << classAverage << endl;  
}  // 计算每个学生的总分  
double calculateClassTotalScore(double grades[NUM_STUDENTS][NUM_COURSES], int studentIndex) {  double totalScore = 0;  for (int j = 0; j < NUM_COURSES; ++j) {  totalScore += grades[studentIndex][j];  }  return totalScore;  
}  // 找到总分最低的学生  
void findMinScoreStudent(double grades[NUM_STUDENTS][NUM_COURSES], int& minStudent) {  minStudent = 0; // 初始化为第一个学生  for (int i = 1; i < NUM_STUDENTS; ++i) {  double totalScoreCurrent = calculateClassTotalScore(grades, i);  double totalScoreMin = calculateClassTotalScore(grades, minStudent);  if (totalScoreCurrent < totalScoreMin) {  minStudent = i;  }  }  
}