Question

我试图对字符串执行索引搜索，但它运行但问题是它只打印出i [0]这是我的第一个条目。如果我查找另一个条目它不起作用。请帮忙.. void clist（string fn []，string ln []，int size）;

int search_list(const string fn[],const string ln[], int size, string find);

int main(){

    string search;

    cout << "This program searches a list .\n";

    const int total = 3;

    string fn[total];
    string ln[total];

    clist(fn,ln, total);

    cout << "Search contact:____  ";

    cin >> search;

    search_list(fn,ln, total, search);

  return 0;

}

void clist(string fn[],string ln[], int size){

    cout << "Enter " << size << " contact.\n";

    for (int index = 0; index < size; index++)
     cin >> fn[index] >> ln[index] ;

}

int search_list(const string fn[], const string ln[],int size, string search){

   for(int i=0;i<size;i++){

     if((fn[i] == search)&& (i < size)){

       cout<<"Result found "<<fn[i]<<" "<<ln[i]<<endl;

      break;

              }

    cout<<"no record found"<<endl;

     break;

    }

}

Answer 1

你正在做一个循环并在第一次迭代后明确告诉它break。试着这样写：

bool found = false;
for(int i=0;i<size;i++){
 if(fn[i] == search){ // No need to check for(i < size)
   found = true;
   cout<<"Result found "<<fn[i]<<" "<<ln[i]<<endl;
   break;
 }
}

if(!found)
  cout<<"no record found"<<endl;

Answer 2

您需要一个给定要搜索的元素的函数，找到该元素的索引。不要自己编写，在数组上使用std::find

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

int main()
{
   std::string xx[3];
   xx[0] = "zero";
   xx[1] = "one";
   xx[2] = "two";
   int index = std::find(xx, xx+3, "two") - xx;
   if (index < 3) std::cout << "found in position: " << index << endl;
   else std::cout << "not found" << endl;
}

我认为在您的情况下，最好至少使用std::vector或struct将您的信息存储在两个数组中

如何从数组执行索引搜索

2 个答案: