Question

How to convert an int array to string in C++

Answer 1

#include <iostream>
#include <sstream>
  
int main()
{
    int arr[] = { 4, 7, 9, 100, 8 };
  
    std::ostringstream os;
    for (int i: arr) {
        os << i << " ";
    }
  
    std::string str(os.str());
    
    std::cout << str;
}

  
  
    
/*
run:
    
4 7 9 100 8 
   
*/

 

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Answer 2

#include <iostream>
#include <string>
  
std::string convert_int_array_to_string(int arr[], int size) {
    std::string str;
     
    for (int i = 0; i < size; i++) {
        str += std::to_string(arr[i]) + " ";
    }
        
    return str;
}
    
int main() {
    int arr[] = { 4, 7, 5, 18, 29, 0, 3 };
 
    int size = sizeof(arr) / sizeof(arr[0]);
    
    std::string str = convert_int_array_to_string(arr, size);
        
    std::cout << str;
}
    
    
    
/*
run:
    
4 7 5 18 29 0 3 
    
*/

 

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Answer 3

#include <iostream>
#include <sstream>
#include <string>
  
std::string convert_int_array_to_string(int arr[], int size) {
    std::string str = "";
    std::ostringstream oss;
     
    for (int i = 0; i < size; i++) {
        oss << arr[i];
        str += oss.str() + " ";
        oss.str("");
        oss.clear();
    }
        
    return str;
}
    
int main() {
    int arr[] = { 4, 7, 5, 18, 29, 0, 3 };
 
    int size = sizeof(arr) / sizeof(arr[0]);
    
    std::string str = convert_int_array_to_string(arr, size);
        
    std::cout << str;
}
    
    
    
/*
run:
    
4 7 5 18 29 0 3 
    
*/
   

 

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