Question

How to count the white spaces in a string in C++

Answer 1

#include <iostream>

int count_white_spaces_in_string(const char* s) {
    int white_spaces = 0;
    const char* p = s;
    
    while (*p != '\0') {
        if (*p == ' ' || *p == '\n' || *p == '\t' || *p == '\r') {
            white_spaces++;
        }
        p++;
    }

    return white_spaces;
}

int main() {
    const char* s = "C++ \r Programming \n Developer \t  ";
    
    std::cout << "White spaces = " << count_white_spaces_in_string(s) << std::endl;
}


   
/*
run:
   
White spaces = 10

*/
 

 

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Answer 2

#include <iostream>
#include <string>

int count_white_spaces_in_string(std::string str) {
    int white_spaces = 0;

    for (char ch : str) {
        if (ch == ' ' || ch == '\n' || ch == '\t' || ch == '\r') {
            white_spaces++;
        }
    }
    
    return white_spaces;
}

int main() {
    std::string str = "C++ \r Programming \n Developer \t  ";
    
    std::cout << "White spaces = " << count_white_spaces_in_string(str) << std::endl;
}


   
/*
run:
   
White spaces = 10

*/
 

 

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