#include <iostream>
#include <string>
#include <iomanip>
#include <sstream>
// Function to replace a digit at a given position in a floating-point number
double replaceFloatDigit(double number, size_t position, char newDigit) {
// Validate that newDigit is indeed a digit
if (newDigit < '0' || newDigit > '9') {
throw std::invalid_argument("Replacement must be a digit (0-9).");
}
// Convert number to string with enough precision to preserve digits
std::ostringstream oss;
oss << std::fixed << std::setprecision(10) << number; // Adjust precision as needed
std::string strNum = oss.str();
// Validate position
if (position >= strNum.size()) {
throw std::out_of_range("Position is out of range for the number string.");
}
// Replace the digit (skip if it's a decimal point or minus sign)
if (strNum[position] == '.' || strNum[position] == '-') {
throw std::invalid_argument("Position points to a non-digit character.");
}
strNum[position] = newDigit;
// Convert back to double
return std::stod(strNum);
}
int main() {
try {
double num = 89710.291;
size_t pos = 2; // position to replace (0-based index
char newDigit = '8';
double result = replaceFloatDigit(num, pos, newDigit);
std::cout << "Modified number: " << std::setprecision(10) << result << "\n";
} catch (const std::exception &e) {
std::cerr << "Error: " << e.what() << "\n";
}
}
/*
run:
Modified number: 89810.291
*/
