Question

How to get the length of the last word in a string with C++

Answer 1

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

int lengthOfLastWord(std::string str) {
    std::vector<std::string> vec;
    std::string word = "";
    
    for (char c : str) {
        if (c == ' ') {
            vec.push_back(word);
            word = "";
        } else {
            word += c;
        }
    }
    
    vec.push_back(word);
    
    return vec.back().length();
}

int main() {
    std::string str = "java c++ go javascript rust";
    
    std::cout << "The length of the last word = " << lengthOfLastWord(str);
}

 
 
 
/*
run:
 
The length of the last word = 4
 
*/

 

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Answer 2

#include <iostream>
#include <string>
#include <sstream>

int lengthOfLastWord(std::string str) {
    std::stringstream iss(str);
      
    std::string word;  
    
    while (iss >> word) {}
    
    return word.size();
}

int main() {
    std::string str = "java c++ go javascript rust";
    
    std::cout << "The length of the last word = " << lengthOfLastWord(str);
}

 
 
 
/*
run:
 
The length of the last word = 4
 
*/

 

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