所以,我是 C++ 编程的新手,作为一项作业,我的老师让我们创建一个应用程序。我开始编码,这就是我想出的。我尝试在 CodeBlocks 中编译代码,但它给了我很多错误:
错误:'petProfile' 之前需要主表达式 在 int main() 中,在 switch 语句的情况 1 到情况 3 中。
错误:“(*(petProfile + ((sizetype) ((unsigned int)petIndex) * 4u))))->Pet::vaccNames = nextVaccN”中的“operator=”不匹配强> 它来自这行代码:petProfile[petIndex]->vaccNames = nextVaccN;
相同类型的错误:petProfile[petIndex]->vaccDates = nextVaccD;
并且,petProfile[petIndex]->timeBetween = nextTimeDiff;
如果我能得到任何帮助,我将不胜感激,谢谢。
//Constant
const int maxNumOfPet = 8;
//Functions
void newProfile(Pet petProfile);
void updateExist(Pet petProfile);
void viewPetFile(Pet petProfile);
void howToUse();
int main()
{
int usersOption;
int* optionPointer = &usersOption;
Pet petProfile[maxNumOfPet];
//the do while loop will start here, it will display the start menu, and direct to the different functions
//until the user selects to exit.
do
{
//Displays the different options to the user.
cout << "\n1) Create New Pet Profile" << endl;
cout << "2) Update A Existing Profile" << endl;
cout << "3) View A Pet Profile" << endl;
cout << "4) How To Use" << endl;
cout << "5) Quit" << endl;
cout << "Please pick the option you wish to do." << endl;
cin >> *optionPointer;
switch (usersOption)
{
case 1:
newProfile(Pet petProfile);
break;
case 2:
updateExist(Pet petProfile);
break;
case 3:
viewPetFile(Pet petProfile);
break;
case 4:
howToUse();
break;
case 5:
cout << "Bye, Bye!";
return 0;
} //End of Switch Statement
} while (usersOption >= 1 || usersOption < 5);
return 0;
}
void newProfile(Pet *petProfile[], const int maxNumOfPet)
{
int changeOp;
int nextVaccD;
char correct;
double nextTimeDiff;
string nextVaccN;
int petIndex = 0;
while (petIndex <= maxNumOfPet)
{
//check if Pet is empty
while (petProfile[petIndex]->petNames.empty())
{
//Will receive the users input for the following topics, and add it to their vectors.
cout << "Please enter your pet's name, Or enter 0 to quit. " << endl;
if ( cin.peek() == '\n' )
cin.ignore();
string nextPetN;
getline(cin, nextPetN);
if (nextPetN == "0")
return;
//Will add an element to the vector petNames and save the users input to it.
petProfile[petIndex]->petNames = nextPetN;
cout << "Please enter the type of animal you have:" << endl;
if ( cin.peek() == '\n' )
cin.ignore();
string nextAnimalT;
getline(cin, nextAnimalT);
//Will add an element to the vector animalType and save the users input to it.
petProfile[petIndex]->animalType = nextAnimalT;
cout << "Please enter the name of a vaccine the pet has got: " << endl;
cin >> nextVaccN;
//Will add an element to the vector vaccNames and save the users input to it.
petProfile[petIndex]->vaccNames = nextVaccN;
cout << "Please enter the date " << nextVaccN << " was given, in this format MMDDYYYY." << endl;
cin >> nextVaccD;
//Will add an element to the vector vaccDates and save the users input to it.
petProfile[petIndex]->vaccDates = nextVaccD;
cout << "Please enter the time difference between each administration of this vaccine: " << endl;
cin >> nextTimeDiff;
//Will add an element to the vector timeBetween and save the users input to it.
petProfile[petIndex]->timeBetween = nextTimeDiff;
//Recap the information entered, and change if it is necessary.
cout << "\nSo far you entered: " << endl;
cout << nextPetN << endl;
cout << nextAnimalT << endl;
cout << nextVaccN << endl;
cout << nextVaccD << endl;
cout << nextTimeDiff << endl;
cout << "Is this information correct?" << endl;
cout << "Answer T if this is true or F if this is false" << endl;
cin >> correct;
if (correct == 'F' || correct == 'f')
{
cout << "What do you wish to change: " << endl;
cout << "1) " << nextPetN << endl;
cout << "2) " << nextAnimalT << endl;
cout << "3) " << nextVaccN << endl;
cout << "4) " << nextVaccD << endl;
cout << "5) " << nextTimeDiff << endl;
cin >> changeOp;
switch (changeOp)
{
case 1:
cout << "Please enter your pets' name: " << endl;
getline(cin, nextPetN);
break;
case 2:
cout << "Please enter the type of animal you have:" << endl;
getline(cin, nextAnimalT);
break;
case 3:
cout << "Please enter the name of the vaccines the pet has got: " << endl;
getline(cin, nextVaccN);
break;
case 4:
cout << "Please enter the date " << nextVaccN << " was given, in this format MMDDYYYY." << endl;
cin >> nextVaccD;
break;
case 5:
cout << "Please enter the time difference between each administration of this vaccine: " << endl;
cin >> nextTimeDiff;
break;
} //end switch
} //end if statement
}//end second while loop
} //end first while loop
petIndex++;
} //end newProfile function
最佳答案
你的函数声明
void newProfile(Pet petProfile);
不符合定义
void newProfile(Pet *petProfile[], const int maxNumOfPet)
另外,行
case 1:
newProfile(Pet petProfile);
应该是
case 1:
newProfile(petProfile); // no Pet here, same for the other case-s
检查您的其他函数声明是否与其定义匹配。
关于c++ - 你如何修复 C++ 预期的主表达式错误?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/30552572/