Question

How to convert string to int in C++

Answer 1

#include <iostream>
#include <sstream> 

int main() {
    auto s = "98735";
    
    std::stringstream ss(s); 
    
    int n; 
    ss >> n;
     
    std::cout << n;
}



/*
run:

98735

*/

 

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Answer 2

#include <iostream>

int main() {
    auto s = "98735";

    int n = std::stoi(s); 

    std::cout << n;
}
 
 
 
/*
run:
 
98735
 
*/

 

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Answer 3

#include <iostream>
#include <sstream> 
 
int main() {
    auto s = "98735";

    int n;
    std::istringstream(s) >> n;
    
    std::cout << n;
}
 
 
 
/*
run:
 
98735
 
*/

 

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Answer 4

#include <iostream>
#include <sstream>
  
int convertToInt(std::string str) {
   int n;
 
   std::stringstream ss(str);
   ss >> n;
     
   return n;
}
  
int main()
{
   std::string str = "903487";
     
   int num = convertToInt(str);
     
   std::cout << num;
} 
    
   
    
    
/*
run:
    
903487
    
*/

 

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Answer 5

#include <iostream>
 
int main()
{
   std::string str = "903487";
     
   int num = std::stoi(str);
     
   std::cout << num;
} 
    
   
    
    
/*
run:
    
903487
    
*/

 

 

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Answer 6

#include <iostream>
  
int convertToInt(std::string str) {
   int n;
   sscanf(str.c_str(), "%d", &n);
 
   return n;
}
  
int main()
{
   std::string str = "903487";
     
   int num = std::stoi(str);
     
   std::cout << num;
} 
    
   
    
    
/*
run:
    
903487
    
*/

 

70+ SQL courses for beginners and professionals