Help displaying string letter by letter

[Robsta107]

I am supposed to display a text string letter by letter, and it has to be incremented once by pressing any letter on the keyboard it will output the first letter in the string, then the second letter, then the third and so on.
this is what I have so far, integer data is the ascii values in hex of the keys I am pressing. I'm trying to say for any value between the first key (nul) and the last key (del) the text string will be incremented by 1 so it would go T-e-x-t_s-t-r-i-n-g and so on. what am I doing wrong? I don't think this works.

int put_edit(volatile int data)
{
    char text_string[] = "\nText String incremented\n> \0";
    int i;
    
    for( i = 0; text_string[i] !=0; ++i){
    if (data < 0x00 & data > 0x7F)
    {
         i++;
    }
    
    
    
    }
        
    
    return data;
    
}

[Salem]

> if (data < 0x00 & data > 0x7F)
It's usual practice to use the boolean && operator in logical expressions, not the bitwise version.

Also, something can't be less than zero and greater than something positive at the same time.

Finally, shouldn't you be comparing text_string[i] with data in some way?

[Robsta107]

> if (data < 0x00 & data > 0x7F)
It's usual practice to use the boolean && operator in logical expressions, not the bitwise version.

Also, something can't be less than zero and greater than something positive at the same time.

Finally, shouldn't you be comparing text_string[i] with data in some way?

I what you're saying, so i fixed my if statement, and am I supposed to compare text_string[i] with data? can I make data just = to text string[i]?

[Malcolm McLean]

You can't do this in standard C as there is no kbhit() or similar function which scans the keyboard for key presses.
The stdin functions like getchar are line-based, they wait for the user to compose an entire line and only give input after he presses return.

Assuming you have a kbhit() it is easy;

char *text = "Text String Incremented".
int i = 0;
while(text[i] !=0)
{
    if(kbhit())                    // test for keyboard press - function may have different name on your platform
    {
       getchar();                  // consume the character (may work differently on your platform
       printf("%c", text[i]);    // print out the letter
       i++;
    }
}