C / C++ / MFC

*(s + i) != '\0' < len

i < len

char* my_strdelupper(char* s){
    int i, len;
    char* sl;
    
    len = strlen(s);
    sl = (char*)malloc(len+1); // space for the converted string
    i = 0; // index to the converted string buffer
    while (*s != '\0'){
        if (!isupper(*s)){
            sl[i++] = *s; // copy lower case letters
        }
        s++;
    }
    sl[i] = '\0';
    printf("%s\n", sl);
    
    return sl;
}

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

#define false 1
#define true 0


char* my_strdelupper(char* s){

      int i,j, len;
      char aux[100];
      char debuging;

      len = strlen(s);
      j = 0;
      for (i = 0; *(s + i) != '\0'; i++){
          if (!isupper(*(s+i))){
              debuging = *(s + i);
              *(aux + j) = debuging;
             j++;
          }
      }
      *(aux + j) = '\0';

      strcpy(s, aux);
      return s;
}

int main()
{
  char s3[]="Maria, TU sabes que TU éS o meu \"Grande Amor\"";
  printf("%s\n",my_strdelupper(&s3[0])); /* aria, sabes que é s o meu "rande mor " */

  return 0;
}

char * remove_upper( char * s)
{
  char * p, *q;

  for (p = q = s; *p != '\0'; ++p)
    if ( ! isupper(*p) )
      *q++ = *p;

  *q = '\0';
  return s;
}

Quote:

cout<<"\nEnter ">>count>>" numbers:\n";

out << "\nEnter " << count << " numbers:\n";