c语言读取顺序文件并处理

我们今天学习如何在创建读取文件之后，对其进行处理！不妨看看c语言如何读取顺序文件并处理，以下仅供参考！

ALt="c语言读取顺序文件并处理" title="c语言读取顺序文件并处理">

以下是代码：

# include

# include

# include

# include

# include

using namespace std;

enum requesttype{ZERO_BALANCE=1,CREDIT_BALANCE, DEBIT_BANLANCE,END};//这里定义的是枚举类型，也就是赋值1,2,3

int getrequest();

bool shoulddisplay(int, double);//这个函数的`作用，就是从读取的数据中选择不同的条件进行输出！

void outputline(int, const string, double);//输出数据

int main() {

ifstream inclientfile("", ios::in);//我们假定已经定义好了相关的数据在文件中！

if (!inclientfile) {

cerr << "file could not be opened" << endl;

exit(1);

}

int request;

int account;

char name[30];

double balance;

request = getrequest();

while (request != END) {//选择数据类型

switch (request) {

case ZERO_BALANCE:

cout << "accounts with zero balances:";

break;

case CREDIT_BALANCE:

cout << "accounts with creadit balances:";

break;

case DEBIT_BANLANCE:

cout << "accounts with debit balances:";

break;

}

inclientfile >> account >> name >> balance;//读入数据

while (!()) {//设置循环条件

if (shoulddisplay(request, balance)) {

outputline(account, name, balance);

}

inclientfile >> account >> name >> balance;

}

r();

g(0);//回到文件的起始位置

request = getrequest();

}

cout << "end of run." << endl;

system("pause");

return 0;

}

int getrequest() {

int request;

cout << "enter request" << endl

<< "1-list accounts with zero balances" << endl

<< "2-list accounts with credit balances" << endl

<< "3-list accounts with debit balances" << endl

<< "4-end of run" << fixed << showpoint;

do {

cout << "?";

cin >> request;

} while (requestEND);

return request;

}

bool shoulddisplay(int type, double balance) {

if (type == ZERO_BALANCE&&balance == 0) {

return true;

}

if (type == CREDIT_BALANCE&&balance < 0) {

return true;

}

if (type == DEBIT_BANLANCE&&balance > 0) {

return true;

}

return false;

}

void outputline(int account, const string name, double balance) {

cout << left << setw(10) << account << setw(13) << name

<< setw(7) << setprecision(2) << right << balance << endl;

}

以下是执行后结果：