我有一个结构矢量,包括两个字符串,一个长整数和一个整数数组。在创建了所述结构体后,我将数组中的每个元素初始化为0.我的问题是,如何为数组中的每个元素分配不同的值?我试图使用swap和assign,但它们更多的是有两个1维向量,而不是2维向量,我只想在给定时间更改某个结构中的值。请帮忙?谢谢!
如果你想看一些代码,这就是我到目前为止所做的:
//this is my struct
typedef struct {
string lastName;
string firstName;
long int gNumber;
int grades[12];
} student;
//this function takes data from a file, fills it into a struct, then pushes back into //vector
bool loadStudentData( vector<student> &studentRecords, ifstream *inFile, student tempStudent) {
int idx = 0;
stringstream fileLine;
string line;
bool isLoaded = true;
char letterInGNumber;
while (getline(*inFile, line)) {
fileLine << line;
getline(fileLine, tempStudent.lastName, ',');
getline(fileLine, tempStudent.firstName, ',');
fileLine >> letterInGNumber;
fileLine >> tempStudent.gNumber;
for (idx = 0; idx <= 11; idx++) {
tempStudent.grades[idx] = 0;
}
studentRecords.push_back(tempStudent);
fileLine.flush();
}
return isLoaded;
}
//this function is trying to take things from a second file, and if the Gnumber(the //long int) is found in the vector then assign values to the grade array
void loadClassData(vector<student> &studentRecords, ifstream *inFile) {
int idx = 0, idxTwo = 0, idxThree = 0;
long int tempGNumber = 0;
stringstream fileLine;
vector<long int> gNumbers;
bool numberFound = false;
char letterInGNumber;
string line;
while (getline(*inFile, line)) {
idx++;
numberFound = false;
fileLine << line;
fileLine >> letterInGNumber;
fileLine >> tempGNumber;
for (idxTwo = 0; idxTwo <= studentRecords.size(); idxTwo++) {
if (studentRecords[idxTwo].gNumber == tempGNumber) {
numberFound = true;
break;
}
}
if (numberFound) {
for (idxThree = 0; idxThree <= 11; idxThree++) {
//fileLine >> studentRecords[idx].grades[idxThree];
/**********here is the problem, I don't know how to assign the grade values******/
}
}
else {
cout << "G Number could not be found!" << endl << endl;
}
fileLine.flush();
}
return;
}
人?请?
答案 0 :(得分:1)
你应该做的是定义一个运算符&gt;&gt;过载并只读取它。例如,
//assume the following structure when reading in the data from file
// firstName lastName N n1 n2 n3 ... nN
ostream& operator>>(ostream& stream, student& s){
stream >> s.firstName;
stream >> s.lastName;
stream >> s.gNumber
for(int i = 0; i < s.gNumber; ++i){
stream >> s.grades[i];
}
}
//... in main
student temp;
std::vector<student> studentList;
while(inFile >> temp) studentList.push_back(temp);