15
Tôi biết mã đơn giản của nó, Làm cách nào để khắc phục sự cố "Hệ thống không được khai báo trong phạm vi"?Hệ thống không được khai báo trong phạm vi?
#include<iostream>
using namespace std;
int main(void)
{
system ("TITLE Calculator");
system ("COLOR 2");
char cChar;
double dfirstnumber;
double dsecondnumber;
char cDoagain;
do
{
system("CLS");
cout << "Please enter the first number you would like to use."<< endl;
cin >> dfirstnumber;
cout<< "Please enter the operation you would like to perform." << " (+,-,*,or /)" << endl;
cin >> cChar;
cout<< "Please enter the second number you would like to use." << endl;
cin >> dsecondnumber;
switch (cChar)
{
case '+':
cout << "The answer is: " << dfirstnumber << "+" << dsecondnumber << "=" <<
(dfirstnumber + dsecondnumber) << endl;
break;
case '-':
cout << "The answer is: " << dfirstnumber << "-" << dsecondnumber << "=" <<
(dfirstnumber - dsecondnumber) << endl;
break;
case '*':
cout << "The answer is: " << dfirstnumber << "*" << dsecondnumber << "=" <<
(dfirstnumber * dsecondnumber) << endl;
break;
case 'x':
cout << "The answer is: " << dfirstnumber << "x" << dsecondnumber << "=" <<
(dfirstnumber * dsecondnumber) << endl;
break;
case 'X':
cout << "The answer is: " << dfirstnumber << "X" << dsecondnumber << "=" <<
(dfirstnumber * dsecondnumber) << endl;
break;
case '/':
if(dsecondnumber == 0){
cout<< "That is an invalid operation." << endl;}
else{
cout << "The answer is: " << dfirstnumber << "/" << dsecondnumber << "=" <<
(dfirstnumber/dsecondnumber) << endl;
}
break;
default:
cout << "That is an invalid operation." << endl;
break;
}
cout << "Would you like to start again? (Y/N)" << endl;
cin >> cDoagain;
}while (cDoagain == 'Y' or cDoagain == 'y');
system("PAUSE");
return 0;
}
Heres nhắn cuối của tôi:
C:\Documents and Settings\Nilo\My Documents\Work\Testing\main.cpp||In function 'int main()':| C:\Documents and Settings\Nilo\My Documents\Work\Testing\main.cpp|8|error: 'system' was not declared in this scope||
|=== Build finished: 1 errors, 0 warnings ===|
hệ thống '(" TITLE Calculator ") là gì; hệ thống ("COLOR 2"); 'nghĩa vụ phải làm, hệ thống cos không phải là một chức năng được xây dựng –