特别是我在看207到219行：
// ZakAttack.cpp--A program for calculating student grades and
// displaying the overall GPA
// Shaheen Fathima Abdul Jamal Nazar, CISP 360
// Instructor: Professor Fowler
// Date: 04/27/2018
#include <iomanip>
#include <iostream>
#include <limits>
#include <string>
using namespace std;
// Variable Declarations
string stName;
int scores[50];
int *ptr = scores;
int count = 0;
// Function Prototypes
void results();
void gradeAdd();
void mainMenu();
int getUserChoice();
void mainEvent();
int main() {
// Program Greeting
cout << " Hi! Welcome to the Zak Attack Program!\n" << endl;
cout << " This program calculates the grades for a\n" << endl;
cout << " specific number of quizzes taken by a student.\n" << endl;
cout << " It also displays the overall grades along with\n" << endl;
cout << " the letters (A-F) based on the scores attained by the student! "
<< endl;
cout << endl;
cout << " Enter the name of the student (First and Last): ";
getline(cin, stName);
cout << endl;
mainEvent();
return 0;
}
void mainEvent() {
int userInput;
bool task = false;
do {
mainMenu();
cout << "\nEnter your choice: ";
userInput = getUserChoice();
if (userInput == 1) {
gradeAdd();
} else if (userInput == 2) {
results();
break;
} else if (userInput == 3) {
task = true;
}
} while (task == false);
}
void results() {
// variables to be used
int tem, sNum, rNum, pNum;
bool swapNum;
int scCopy[50];
int *ptrCopy = scCopy;
int lowScore[15];
int *ptrLow = lowScore;
double gpAvg = 0;
char rChoice;
cout << " Name of Student: " << stName << endl;
// Copying scores[] to scCopy[] array
for (int i = 0; i < count; i++) {
*(ptrCopy + i) = *(ptr + i);
}
do {
swapNum = false;
for (int j = 0; j < count; j++) {
if (*(ptrCopy + j) > *(ptrCopy + (j + 1))) {
tem = *(ptrCopy + j);
*(ptrCopy + j) = *(ptrCopy + (j + 1));
*(ptrCopy + (j + 1)) = tem;
swapNum = true;
}
}
} while (swapNum);
sNum = (count * 0.3);
rNum = count;
pNum = sNum;
for (int i = 0; i < sNum; i++) {
*(ptrLow + i) = *(ptrCopy + i);
*(ptrCopy + i) = 0;
pNum--;
}
// Display the grades as letters and overall GPA
for (int i = 0; i < count; i++) {
if (*(ptrCopy + i) >= 94) {
cout << *(ptrCopy + i) << ": A " << endl;
gpAvg += 4;
} else if (*(ptrCopy + i) >= 90 && *(ptrCopy + i) < 94) {
cout << *(ptrCopy + i) << ": A- " << endl;
gpAvg += 3.7;
} else if (*(ptrCopy + i) >= 87 && *(ptrCopy + i) < 90) {
cout << *(ptrCopy + i) << ": B+ " << endl;
gpAvg += 3.3;
} else if (*(ptrCopy + i) >= 83 && *(ptrCopy + i) < 87) {
cout << *(ptrCopy + i) << ": B " << endl;
gpAvg += 3;
} else if (*(ptrCopy + i) >= 80 && *(ptrCopy + i) < 83) {
cout << *(ptrCopy + i) << ": B- " << endl;
gpAvg += 2.7;
} else if (*(ptrCopy + i) >= 77 && *(ptrCopy + i) < 80) {
cout << *(ptrCopy + i) << ": C+ " << endl;
gpAvg += 2.3;
} else if (*(ptrCopy + i) >= 73 && *(ptrCopy + i) < 77) {
cout << *(ptrCopy + i) << ": C " << endl;
gpAvg += 2;
} else if (*(ptrCopy + i) >= 70 && *(ptrCopy + i) < 73) {
cout << *(ptrCopy + i) << ": C- " << endl;
gpAvg += 1.7;
} else if (*(ptrCopy + i) >= 67 && *(ptrCopy + i) < 70) {
cout << *(ptrCopy + i) << ": D+ " << endl;
gpAvg += 1.3;
} else if (*(ptrCopy + i) >= 60 && *(ptrCopy + i) < 67) {
cout << *(ptrCopy + i) << ": D " << endl;
gpAvg += 1;
} else if (*(ptrCopy + i) > 1 && *(ptrCopy + i) < 60) {
cout << *(ptrCopy + i) << ": F " << endl;
}
}
cout << "*******************" << endl;
// Dropped scores
for (int i = 0; i < sNum; i++)
cout << *(ptrLow + i) << " [Dropped Score] " << endl;
// Calculation of GPA and displaying results
rNum -= sNum;
cout << fixed << setprecision(2) << endl;
gpAvg = (gpAvg / rNum);
cout << " Grade Point Average (GPA): " << gpAvg << endl;
cout << endl;
if (gpAvg == 4) {
cout << " Grade: A" << endl << endl;
cout << " Excellent Job! " << endl;
cout << " Keep up the good progress! " << endl;
} else if (gpAvg < 4 && gpAvg > 3.67) {
cout << " Grade: A-" << endl << endl;
cout << " Good Score! " << endl;
cout << " Keep Going! " << endl;
} else if (gpAvg < 3.67 && gpAvg > 3.33) {
cout << " Grade: B+" << endl << endl;
cout << " Good Work! " << endl;
cout << " Study a little more. " << endl;
} else if (gpAvg < 3.33 && gpAvg > 3) {
cout << " Grade: B" << endl << endl;
cout << " Good " << endl;
cout << " Need to study even more! " << endl;
} else if (gpAvg < 3 && gpAvg > 2.67) {
cout << " Grade: B- " << endl << endl;
cout << " Well done " << endl;
cout << " but need to work hard, " << endl;
cout << " since you are close to a C! " << endl;
} else if (gpAvg < 2.67 && gpAvg > 2.33) {
cout << " Grade: C+ " << endl << endl;
cout << " Looks like the grades are slipping " << endl;
cout << " Need to spend more time studying! " << endl;
} else if (gpAvg < 2.33 && gpAvg > 2) {
cout << " Grade: C " << endl << endl;
cout << " Getting low! " << endl;
cout << " Need to work even harder! " << endl;
} else if (gpAvg < 2 && gpAvg > 1.67) {
cout << " Grade: C- " << endl << endl;
cout << " Risky! Gotta study even more! " << endl;
} else if (gpAvg < 1.67 && gpAvg > 1.33) {
cout << " Grade: D+ " << endl << endl;
cout << " Going low on your " << endl;
cout << " chances of passing! " << endl;
cout << " Work even more harder! " << endl;
} else if (gpAvg < 1.33 && gpAvg > 1) {
cout << " Grade: D " << endl;
cout << " Chances of passing the class " << endl;
cout << " are getting even lower! " << endl;
cout << " Concentrate and study or seek help " << endl;
cout << " from a tutor! " << endl;
} else if (gpAvg < 1 && gpAvg > 0.67) {
cout << " Grade: D- " << endl;
cout << " Nearly no chances of passing! " << endl;
} else if (gpAvg < 0.67) {
cout << " Grade: F " << endl;
cout << " Disappointing and dejecting! " << endl;
cout << " Try Again or Opt for something else " << endl;
}
cout << " Would you like to enter the grades for another student?";
cin >> rChoice;
if (rChoice == 'Y') {
cin.clear();
cin.ignore(numeric_limits<streamsize>::max(), '\n');
cout << " Enter name of the student (First and Last): ";
getline(cin, stName);
cin.clear();
cin.ignore();
mainEvent();
} else if (rChoice == 'N') {
cout << " Good Bye! " << endl;
}
}
void gradeAdd() {
cout << "\nEnter quiz # " << (count + 1) << " score: ";
cin >> *(ptr + count);
while (*(ptr + count) > 100 || *(ptr + count) < 0) {
cout << " Sorry! Invalid Input! Please enter a value from 0-100: "
<< endl;
cin.clear();
cin.ignore(numeric_limits<streamsize>::max(), '\n');
cin >> *(ptr + count);
}
count++;
}
void mainMenu() {
cout << "1. Add a grade" << endl;
cout << "2. Display Results" << endl;
cout << "3. Quit" << endl;
}
int getUserChoice() {
int userInput;
cin >> userInput;
while (userInput != 1 && userInput != 2 && userInput != 3) {
cout << " Invalid Choice! Please enter a choice from 1 to 3: " << endl;
cin.clear();
cin.ignore(numeric_limits<streamsize>::max(), '\n');
cin >> userInput;
}
return userInput;
}
https://repl.it/@Shaheen_Fathima/EducatedJubilantBusiness
我不知道如何在提示用户输入其他学生姓名后立即修正错误。就像代码编译并提示另一个学生的名字，但是当他们被显示时的成绩，它们显示为从上一个学生的成绩作为新学生成绩的累积成绩。
这是家庭作业的一部分。
答案 0 :(得分：0)
你的问题在这里：
getline(cin, stName);
cin.clear();
cin.ignore();
mainEvent();
实际上，您要求cin忽略1个字符，因为getline将在用户输入结束时占用换行符，缓冲区中当前没有要忽略的字符。不要那样做。你应该完全摆脱那里的cin.clear()和cin.ignore行！