int i=65,n=90;
 while(i!=n)
 {
	 std::cout<<char(i)<<std::endl;
 i++;
 }

 
 for(int i=32,n=126;i!=n;i++)
 {
	 std::cout<<char(i)<<std::endl;
 i++;
 }

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

const unsigned char n_begin = 'a';
const unsigned char n_end = 'z';
const size_t str_len = 3;

int next_element(unsigned char *str, size_t strlen) {
	size_t index = strlen - 1;
	int cond = 0;
	while(!cond) {
		cond = 1;
		if(++str[index] > n_end) {
			if (index == 0) {
				return 0;
			}
			str[index--] = n_begin;
			cond = 0;
		}
	}
	return 1;
}

int main(int argc, char** argv) {
	unsigned char str[str_len + 1];
	memset(str, n_begin, str_len);
	str[str_len] = 0;
	do {
		printf("%s\n", str);
	} while(next_element(str, str_len));
	return 0;
}

  #include<stdio.h>
  #include<conio.h>
  #include<stdlib.h>
  int M,N;
  void main(){
  clrscr();
  int next(int *);
  char abc[]={'a','b','c','d','e','#',')','_','@'};
  //char abc[]={'a','b','c'};
  int i;
  int *arr;
  M=sizeof(abc);
  printf("DJIuHHa CJIoBa -> ");
  scanf("%d", &N);
  arr=(int *) calloc(N, sizeof(int));
  for(i=1; i<=N; i++)
     arr[i]=1;
  do{
     for(i=1; i<=N; i++)
        printf("%c", abc[arr[i]-1]);
     printf("\n");
  }
  while(next(arr)!=0);
  getch();
 }

int next(int arr[])
{
 int j=N;
 while(j>0 && arr[j]==M)
    arr[j--]=1;
 if(j>0){
    arr[j]++;
    return 1;
    }
 else return 0;
 }