How to Convert a C++ String to Uppercase

Question

I need to convert a string in C++ to full upper case. I\'ve been searching for a while and found one way to do it:

#include 
#include 

        

Answer 1

You can also use the function from code below to convert it to Upper-case.

#include
#include

using namespace std;

//Function for Converting Lower-Case to Upper-Case
void fnConvertUpper(char str[], char* des)
{
    int i;
    char c[1 + 1];
    memset(des, 0, sizeof(des)); //memset the variable before using it.
    for (i = 0; i <= strlen(str); i++) {
        memset(c, 0, sizeof(c));
        if (str[i] >= 97 && str[i] <= 122) {
            c[0] = str[i] - 32;    // here we are storing the converted value into 'c' variable, hence we are memseting it inside the for loop, so before storing a new value we are clearing the old value in 'c'.
        } else {
            c[0] = str[i];
        }
        strncat(des, &c[0], 1);
    }
}

int main()
{
    char str[20];  //Source Variable
    char des[20];  //Destination Variable

    //memset the variables before using it so as to clear any values which it contains,it can also be a junk value.
    memset(str, 0, sizeof(str));  
    memset(des, 0, sizeof(des));

    cout << "Enter the String (Enter First Name) : ";
    cin >> str; //getting the value from the user and storing it into Source variable.

    fnConvertUpper(str, des); //Now passing the source variable(which has Lower-Case value) along with destination variable, once the function is successfully executed the destination variable will contain the value in Upper-Case

    cout << "\nThe String in Uppercase = " << des << "\n"; //now print the destination variable to check the Converted Value.
}