Question

VC++中 undeclared identifier

#include <iostream>
#include <iomanip>
using namespace std ;

int main()
{ const int n = 30 ;
int i , a[n];
cout << "Enter" << n << "integers \n" ;
for (i=0 ; i<n ; i++ )
cin >> a [i];
cout << " \nThe integers in serverse order : \n";
for ( i=0 ; i<n ; i++ )
cout << setw(6) << a[n-i-1] << (i%10==9? '\n':' ');
return 0;
}

编译没错，组建是有一下错误

d:\c++\microsoft visual studio\myprojects\test1\te02.c(2) : error C2061: syntax error : identifier 'namespace'
d:\c++\microsoft visual studio\myprojects\test1\te02.c(2) : error C2059: syntax error : ';'
d:\c++\microsoft visual studio\myprojects\test1\te02.c(4) : warning C4305: 'initializing' : truncation from 'const double ' to 'const float '
d:\c++\microsoft visual studio\myprojects\test1\te02.c(8) : error C2065: 'cout' : undeclared identifier
d:\c++\microsoft visual studio\myprojects\test1\te02.c(8) : error C2297: '<<' : illegal, right operand has type 'char [3]'
d:\c++\microsoft visual studio\myprojects\test1\te02.c(9) : error C2065: 'cin' : undeclared identifier
d:\c++\microsoft visual studio\myprojects\test1\te02.c(9) : error C2296: '>>' : illegal, left operand has type 'float '
d:\c++\microsoft visual studio\myprojects\test1\te02.c(9) : error C2297: '>>' : illegal, right operand has type 'float '
d:\c++\microsoft visual studio\myprojects\test1\te02.c(11) : error C2297: '<<' : illegal, right operand has type 'char [3]'
d:\c++\microsoft visual studio\myprojects\test1\te02.c(11) : error C2065: 'endl' : undeclared identifier
d:\c++\microsoft visual studio\myprojects\test1\te02.c(12) : error C2297: '<<' : illegal, right operand has type 'char [3]'
执行 cl.exe 时出错.

Answer 1

我这可以正常编译运行。除了30改3，没有其它改动。