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<Post moved from dead thread>
is it possbile if the string letters can be alternatively capital?
like uhmm ex. boring to a bOrInG? and without using the any str?

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As already confirmed, alternating letter case is straightforward. Below are two practical patterns (alternate every character vs. alternate only letters) with ready-to-use C and JavaScript examples, plus a few caveats that address common pitfalls raised in threads like this one (for example handling punctuation or non-ASCII text).

C (skips non-letters, caller frees result):

#include <ctype.h>
#include <stdlib.h>
#include <string.h>

char *alternate_case_letters(const char *s)
{
    size_t n = strlen(s);
    char *out = malloc(n + 1);
    if (!out) return NULL;
    int make_upper = 0; /* start lowercase for first letter */
    for (size_t i = 0; i < n; ++i) {
        unsigned char ch = (unsigned char)s[i];
        if (isalpha(ch)) {
            out[i] = make_upper ? toupper(ch) : tolower(ch);
            make_upper = !make_upper;
        } else {
            out[i] = s[i];
        }
    }
    out[n] = '\0';
    return out;
}

JavaScript (ASCII letters by default; optional Unicode support noted after):

function alternateCaseLetters(str, skipNonLetters = true) {
  if (skipNonLetters) {
    let i = 0;
    return str.replace(/[A-Za-z]/g, ch => (i++ % 2 ? ch.toUpperCase() : ch.toLowerCase()));
  } else {
    return str.split('').map((c, idx) => idx % 2 ? c.toUpperCase() : c.toLowerCase()).join('');
  }
}

/* Example:
   alternateCaseLetters("boring") -> "bOrInG"
*/

Notes and caveats:

  • In C, always cast to unsigned char before calling isalpha/toupper/tolower to avoid undefined behavior. For UTF-8 input in C, these routines operate on bytes; use wide-char functions or a library like ICU for true Unicode case mapping.
  • In JS, toUpperCase()/toLowerCase() work with Unicode, but matching letters with /[A-Za-z]/ is ASCII-only. Use /\p{L}/gu (ES2018+) to match Unicode letters, and toLocaleUpperCase() for locale-specific rules (Turkish i).
  • If the original intent was "no string functions", an ASCII-only manual test (compare ranges 'a'..'z'/'A'..'Z' and adjust codes) will work but is limited and less robust than standard APIs.

This addresses the basic use case shown by and gives safe, extendable code for production use.

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Member Avatar for Ancient Dragon

>>is it possbile
Yes

Member Avatar for Lun

thanx... anyway i got the solution to that..... :D take care

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