Implementation of ToLower function in C

Question

I am writing my own implementation of ToLower(char *str) in C. But i am getting segmentation fault in the function. The function which i wrote is :

void ToLower(         


        

Answer 1

You are almost certainly failing when you call it like:

int main(void)
{
    ToLower("HelloWorld");
    return 0;
}

This is because "HelloWorld" is a literal, constant string, and you cannot change its contents.

Try instead:

int main(void)
{
    char str[] = "HelloWorld";

    // Now str is your own local buffer, that you can modify.
    // It is initialized with the text, but that text can be changed.
    ToLower(str);
    return 0;
}