reverse string upper to lower

To reverse a string from upper case to lower case in C++, you can follow these steps:

1. Start by including the necessary header file for string manipulation:

#include <string>

1. Declare a string variable to store the input string:

std::string inputString;

1. Prompt the user to enter the string and store it in the variable:

std::cout << "Enter a string: ";
std::getline(std::cin, inputString);

1. Iterate over each character in the string using a loop:

for (int i = 0; i < inputString.length(); i++) {
  // Reverse the case of each character
}

1. Inside the loop, check if the current character is an uppercase letter using the isupper() function from the <cctype> header:

if (std::isupper(inputString[i])) {
  // Convert the character to lowercase
}

1. If the current character is an uppercase letter, convert it to lowercase using the tolower() function from the <cctype> header:

inputString[i] = std::tolower(inputString[i]);

1. Finally, after the loop, output the reversed string:

std::cout << "Reversed string: " << inputString << std::endl;

Here is the complete code snippet:

#include <iostream>
#include <string>
#include <cctype>

int main() {
  std::string inputString;

  std::cout << "Enter a string: ";
  std::getline(std::cin, inputString);

  for (int i = 0; i < inputString.length(); i++) {
    if (std::isupper(inputString[i])) {
      inputString[i] = std::tolower(inputString[i]);
    }
  }

  std::cout << "Reversed string: " << inputString << std::endl;

  return 0;
}

This code prompts the user to enter a string, then iterates over each character in the string. If a character is an uppercase letter, it converts it to lowercase using the tolower() function. Finally, it outputs the reversed string with all uppercase letters converted to lowercase.