字符串矢量程序

Question

我創建了一個程序，要求用戶輸入5個記錄在字符串矢量中的名稱。之後程序應該抓住每個名字的第一個和最後一個字母並輸出它們。然而，我的程序在輸入名稱後很好地編譯，我沒有從程序中得到輸出。

任何人都可以幫助我解決此問題，以便它打印輸入的每個名稱的第一個和最後一個字符？

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

using namespace std; 

int main() 
{ 
vector<string> names; 
char first_letter; 
char last_letter; 
string name; 
int n = 0; 

for (int i =0; i < 5; i++) 
{ 
    cout << " Please enter a name: "; 
    cin >> name; 
    names.push_back(name); 
} 

if (!names[n].empty()) 
{ 
    first_letter = *names[n].begin(); 
    last_letter = *names[n].rbegin(); 
    cout << first_letter << " " << last_letter << endl; 
    n++; 
} 

return 0; 
} 

Answer 1

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

using namespace std; 

int main() 
{ 
vector<string> names; 
char first_letter; 
char last_letter; 
string name; 
int n = 0; 

for (int i =0; i < 5; i++) 
{ 
    cout << " Please enter a name: "; 
    cin >> name; 
    names.push_back(name); 
} 

vector<string>::iterator itr = names.begin(); 
for(;itr!=names.end();itr++) 
{ 

    first_letter = *itr[n].begin(); 
    last_letter = *itr[n].rbegin(); 
    cout << first_letter << " " << last_letter << endl; 


} 
return 0; 
} 

Answer 2

您已將其作爲if語句輸入。將其更改爲一個while循環

while (!names[n].empty()) 
{ 
    first_letter = *names[n].begin(); 
    last_letter = *names[n].rbegin(); 
    std::cout << first_letter << " " << last_letter << endl; 
    n++; 
}