Question

C++中关于vector 的问题

我在VS2008中在开头打入如下代码：#include <iostream>#include <vector.h>using namespace std;int main(){ vecotr <double> salaries; bool more = true; while(more) { double s; cout << " Please enter a salary .0 to quit:"; cin >> s; if( s == 0) more = false; else salaries.push_back(s); }
double highest = salaries[0]; int i; for (i = 1;i<salaries.size();i++) if(salaries[i]>highest) highest = salaries[i]; for (i = 0 ; i< salaries.size(); i++) { if ( salaries[i] == highest) cout << "highest salary: " << salaries[i] << endl; } return 0;}为什么vector 没有效果？就是提示：error C2065: “vecotr”: 未声明的标识符 error C2062: 意外的类型“double” error C2065: “salaries”: 未声明的标识符换成#include<vector.h>就提示： fatal error C1083: 无法打开包括文件:“vector.h”: No such file or directory

Answer 1

#include <iostream>
#include <string>
#include <vector>

using namespace std;

int main(){

vector<string> V;

for(string t; cin >> t; V.push_back(t));

for(auto i=V.begin(); i!=V.end(); ++i)
for(auto j=i->begin(); j!=i->end(); ++j)
*j = toupper(*j);

for(auto i=V.begin(); i!=V.end(); ++i)
cout << *i << endl;

return 0;
}
toupper函数的参数是一个字符不是字符串，所以第一个循环迭代全体字符串，第二个循环迭代每一个字符串的全体字符。

Answer 2

成员初始化应该放在构造函数中:
#include <iostream>
#include <string>
#include <vector>

using namespace std;

int main(){

vector<string> V;

for(string t; cin >> t; V.push_back(t));

for(auto i=V.begin(); i!=V.end(); ++i)
for(auto j=i->begin(); j!=i->end(); ++j)
*j = toupper(*j);

for(auto i=V.begin(); i!=V.end(); ++i)
cout << *i << endl;

return 0;
}

Answer 3

#include <iostream>
#include <vector>
using namespace std;
int main()
{
vector <double> salaries;
bool more = true;
while(more)
{
double s;
cout << " Please enter a salary .0 to quit:";
cin >> s;
if( s == 0)
more = false;
else
salaries.push_back(s);
}
double highest = salaries[0];
int i;
for (i = 1;i<salaries.size();i++)
if(salaries[i]>highest)
highest = salaries[i];
for (i = 0 ; i< salaries.size(); i++)
{
if ( salaries[i] == highest)
cout << "highest salary: " << salaries[i] << endl;
}
return 0;
}