Question

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

Answer 1

#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 isDigitsBeforeAndAfterTheDecimalRqual(double number) {
    std::string numStr = std::to_string(number);
     
    removeTrailingZeros(numStr);
 
    // Find the position of the decimal point
    size_t decimalPos = numStr.find('.');
     
    // 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 == afterDecimal;
}
 
int main() {
    double number = 891.891;
 
    std::cout << isDigitsBeforeAndAfterTheDecimalRqual(number) << "\n";
}


 
/*
run:
 
1
 
*/

 

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