Question

How to check if total digits before and after the decimal point are equal in C++

Answer 1

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

bool areTotalDigitsBeforeAndAfterDecimalPointEqual(double number) {
    // Convert the number to a string
    std::ostringstream oss;
    oss << number;
    std::string numStr = oss.str();

    // Find the position of the decimal point
    size_t decimalPos = numStr.find('.');

    // If there's no decimal point
    if (decimalPos == std::string::npos) {
        return false;
    }

    // Get the parts before and after the decimal point
    std::string beforeDecimal = numStr.substr(0, decimalPos);
    std::string afterDecimal = numStr.substr(decimalPos + 1);

    return beforeDecimal.length() == afterDecimal.length();
}

int main() {
    double number = 769.201;
    
    if (areTotalDigitsBeforeAndAfterDecimalPointEqual(number)) {
        std::cout << "yes" << std::endl;
    } else {
        std::cout << "no" << std::endl;
    }
}



/*
run:

yes

*/

 

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Answer 2

#include <iostream>
#include <string>

std::string removeTrailingZeros(std::string &str) {
     // Find the position of the last non-zero character
    size_t end = str.find_last_not_of('0');
      
    // Erase all characters after the last non-zero character
    if (end != std::string::npos) {
        str.erase(end + 1);
    } else {
        // If the string is all zeros, erase the entire string
        str.clear();
    }
      
    return str;
}
 
bool areTotalDigitsBeforeAndAfterDecimalPointEqual(double number) {
    std::string numStr = std::to_string(number);
    
    removeTrailingZeros(numStr);

    // Find the position of the decimal point
    size_t decimalPos = numStr.find('.');
 
    // If there's no decimal point
    if (decimalPos == std::string::npos) {
        return false;
    }
 
    // Get the parts before and after the decimal point
    std::string beforeDecimal = numStr.substr(0, decimalPos);
    std::string afterDecimal = numStr.substr(decimalPos + 1);
 
    return beforeDecimal.length() == afterDecimal.length();
}
 
int main() {
    double number = 769.201;
     
    if (areTotalDigitsBeforeAndAfterDecimalPointEqual(number)) {
        std::cout << "yes" << std::endl;
    } else {
        std::cout << "no" << std::endl;
    }
}
 
 
 
/*
run:
 
yes
 
*/

 

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