Thread: Pointer Question

I am trying to write a program that when you input a line of text it converts it to uppercase and then lowercase. I can convert it to uppercase no problem using a while statement (required) however it doesn't move on the next while statement. Like it doesn't set the pointer back to the text that is input.

Any help?

Code:

printf ("\nEnter a line of text:\n");
gets(text_ptr);

printf ("\nThe line of text in uppercase is:\n");

while (*text_ptr != '\0')
putchar ( toupper (*text_ptr++) ); /* post-increment */

printf ("\n");

printf ("\nThe line of text in lowercase is:\n");

while (*text_ptr != '\0')

putchar ( tolower (*text_ptr++) ); /* post-increment */

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Originally Posted by lascivious

Like it doesn't set the pointer back to the text that is input.

If by "it" you mean your program, that is correct, it does not set the pointer back. You might want to try something like this:

Code:

char input[256]; // or whatever
char *ptr=input;
while(ptr[0] != '\0') ptr++;
// ptr is now at end of input
ptr=input;
//ptr is now set back to the beginning of input

Also read:
- Gets - why it's bad and why you should avoid it.