将输入数组与字符串进行比较
Compare an input array with string
如何使用正确的代码将输入数组与字符串进行比较?
#include<iostream>
#include<cstring>
#include<stdlib.h>
using namespace std;
int main()
{
char user[30] ;
string nama[5]="ali33,abu123,ahmad456,kasim123,rahmat123";
int w,i ;
cout<<"username : ";
cin>>user[30];
for(i=0;i>=0;++i)
{
w=strcmp(nama[i],user);
}
我正在使用 Dev-C++,错误在这一行:
w=strcmp(nama[i],user)
有人知道如何解决这个问题吗?
我建议你研究这个:
std::vector<string> nama = { "ali33", "abu123", "ahmad456",
"kasim123", "rahmat123" };
string user;
cout << "username : ";
int w = -1;
if (cin >> user)
{
for(int i = 0; i < nama.size(); ++i)
if (nama[i] == user)
w = i;
if (w != -1)
std::cout << user << " found at [" << w << "]\n";
else
std::cout << user " not found\n";
}
注意:在理解差异之前,请使用 std::vector
而不是数组,对于任何文本,请使用 std::string
。您可以使用 C++ 标准库函数 std::find()
来查看 user
值是否出现在 nama
中,但是学习如何编写循环和自己做事也很好。
`strcmp()`**is used when comparing c-string data types. Convert your char data type to string and use compare function as illustrated below**`
int main()
{
char user[30];
string nama[5] = { "ali33","abu123","ahmad456","kasim123","rahmat123" };
int w = -99;
int i;
cout << "username : ";
cin >> user[30];
string temp(user);
for (i = 0; i < 5; i++)
{
w = nama[i].compare(temp);
}
}
如何使用正确的代码将输入数组与字符串进行比较?
#include<iostream>
#include<cstring>
#include<stdlib.h>
using namespace std;
int main()
{
char user[30] ;
string nama[5]="ali33,abu123,ahmad456,kasim123,rahmat123";
int w,i ;
cout<<"username : ";
cin>>user[30];
for(i=0;i>=0;++i)
{
w=strcmp(nama[i],user);
}
我正在使用 Dev-C++,错误在这一行:
w=strcmp(nama[i],user)
有人知道如何解决这个问题吗?
我建议你研究这个:
std::vector<string> nama = { "ali33", "abu123", "ahmad456",
"kasim123", "rahmat123" };
string user;
cout << "username : ";
int w = -1;
if (cin >> user)
{
for(int i = 0; i < nama.size(); ++i)
if (nama[i] == user)
w = i;
if (w != -1)
std::cout << user << " found at [" << w << "]\n";
else
std::cout << user " not found\n";
}
注意:在理解差异之前,请使用 std::vector
而不是数组,对于任何文本,请使用 std::string
。您可以使用 C++ 标准库函数 std::find()
来查看 user
值是否出现在 nama
中,但是学习如何编写循环和自己做事也很好。
`strcmp()`**is used when comparing c-string data types. Convert your char data type to string and use compare function as illustrated below**`
int main()
{
char user[30];
string nama[5] = { "ali33","abu123","ahmad456","kasim123","rahmat123" };
int w = -99;
int i;
cout << "username : ";
cin >> user[30];
string temp(user);
for (i = 0; i < 5; i++)
{
w = nama[i].compare(temp);
}
}