convert whole string to uppercase c++

To convert a whole string to uppercase in C++, you can use the toupper() function from the <cctype> library. Here are the steps to do so:

1. Include the <cctype> library at the beginning of your program by adding the following line of code:

#include <cctype>

1. Declare a string variable to store the input string and a string variable to store the uppercase version of the string. For example:

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

int main() {
    std::string inputString;
    std::string uppercaseString;

    // Rest of the code...
}

1. Read the input string from the user using std::getline() or any other appropriate method. For example:

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

1. Iterate over each character in the input string and convert it to uppercase using the toupper() function. Append the converted character to the uppercase string. For example:

for (char c : inputString) {
    uppercaseString += std::toupper(c);
}

1. Print the uppercase string. For example:

std::cout << "Uppercase string: " << uppercaseString << std::endl;

Putting it all together, here's an example of a C++ program that converts a string to uppercase:

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

int main() {
    std::string inputString;
    std::string uppercaseString;

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

    for (char c : inputString) {
        uppercaseString += std::toupper(c);
    }

    std::cout << "Uppercase string: " << uppercaseString << std::endl;

    return 0;
}

This program asks the user to enter a string, converts each character to uppercase, and then prints the uppercase version of the string.