hide Character

[Calavera]

HI.

Does somebody know how to put a char # in every character we type.
I think that it is with Systems Calls.

Example: The program gives me a random character.
Then i have to type the same character, but it haves to appears
´#´.

#include <stdio.h>

/**************************************
função generateChar()
retorna uma letra minúscula aleatória
**************************************/
char x;

char generateChar() {
  static char first = 1;
  if (first) {
    first = 0;
    srandom(time(NULL));
  }
  x = random()%26+'a';
  return x;
}

int main(int argc, char *argv[]) {

  char caracter;

  if(argc < 2) {                                             //Verifica o numero de argumentos passados
    printf("FALTAM ARGUMENTOS\n");
    exit(1);
  }
  int valor = atoi(argv[1]);                                 // transforma o argv[1] em inteiro
  int i;
 
  for(i = 0;i<valor;i++) {                                   // Ciclo que imprime o caracter aleatorio o numero de vezes passado a argv[1]

  printf("%c\n",generateChar());

  do {
    scanf(" %c",&caracter);                                  // Le o caracter dado pelo utlizador
    if(caracter != x) {                                      // Verifica se é igual ao aleatorio
    printf("TENTE DE NOVO\n");
  }
  }
  while(caracter != x);                                      // enquanto o caracter introduzido fôr diferente do aleatorio continua a pedir
  }

  printf("Letra\t\tTempo de Resposta\t\tInstante da resposta\n");
  printf("%c\t\t\t\t\t\t%s%s\n", x, __DATE__":",__TIME__);
    
}

If i insert ´a´, it haves to appear ´#´, but must read ´a´, the output of the letters must be always a '#' like a password but the program must save the letter and not the '#'.

Thanks

[PING]

HI.

Does somebody know how to put a char # in every character we type.
I think that it is with Systems Calls.

Example: The program gives me a random character.
Then i have to type the same character, but it haves to appears
´#´.

#include <stdio.h>

/**************************************
função generateChar()
retorna uma letra minúscula aleatória
**************************************/
char x;

char generateChar() {
  static char first = 1;
  if (first) {
    first = 0;
    srandom(time(NULL));
  }
  x = random()%26+'a';
  return x;
}

int main(int argc, char *argv[]) {

  char caracter;

  if(argc < 2) {                                             //Verifica o numero de argumentos passados
    printf("FALTAM ARGUMENTOS\n");
    exit(1);
  }
  int valor = atoi(argv[1]);                                 // transforma o argv[1] em inteiro
  int i;
 
  for(i = 0;i<valor;i++) {                                   // Ciclo que imprime o caracter aleatorio o numero de vezes passado a argv[1]

  printf("%c\n",generateChar());

  do {
    scanf(" %c",&caracter);                                  // Le o caracter dado pelo utlizador
    if(caracter != x) {                                      // Verifica se é igual ao aleatorio
    printf("TENTE DE NOVO\n");
  }
  }
  while(caracter != x);                                      // enquanto o caracter introduzido fôr diferente do aleatorio continua a pedir
  }

  printf("Letra\t\tTempo de Resposta\t\tInstante da resposta\n");
  printf("%c\t\t\t\t\t\t%s%s\n", x, __DATE__":",__TIME__);
    
}

If i insert ´a´, it haves to appear ´#´, but must read ´a´, the output of the letters must be always a '#' like a password but the program must save the letter and not the '#'.

Thanks

can u please translate your comments into proper english??

[quzah]

can u please translate your comments into proper english??

Why? C is C. You should be able to understand the code for what it is. Sure, not all C is nice and clean to read, but it's still C. Why did you quote the entire thing just to post one wanna-be sentence?

To answer the origional poster, there is no standard way to do this. It is dependant on your OS and compiler. Consider perusing some of these forum search results.

Quzah.

[Salem]

You also need to figure out how to drive your compiler in 'C' mode rather than C++ mode.

> If i insert ´a´, it haves to appear ´#´, but must read ´a´, the output of the letters must be always a '#' like a password
There is no way to do this without knowing your operating system and compiler.

[Calavera]

My operating system is Linux.
The gnu compiler.

#include <stdio.h>

/**************************************
function generateChar()
returns a lower case character
**************************************/
char x;

char generateChar() {
  static char first = 1;
  if (first) {
    first = 0;
    srandom(time(NULL));
  }
  x = random()%26+'a';
  return x;
}

int main(int argc, char *argv[]) {

  char caracter;

  if(argc < 2) {                                             //Verify the number of arguments
    printf("Lack of arguments\n");
    exit(1);
  }
  int valor = atoi(argv[1]);                                 // transforms argv[1] in integer
  int i;
 
  for(i = 0;i<valor;i++) {                                   // Cicle that prints the random character the number of times of argv[1]

  printf("%c\n",generateChar());

  do {
    scanf(" %c",&caracter);                                  // Reads the character the user wrigths
    if(caracter != x) {                                      // Verify if the character of the user is equal to the random character
    printf("TRY AGAIN\n");
  }
  }
  while(caracter != x);                                      // Keeps asking to type character until is not equal to the random character
  }

  printf("Character\t\tReaction Time\t\tDATE and TIME\n");
  printf("%c\t\t\t\t\t\t%s%s\n", x, __DATE__":",__TIME__);
    
}

[quzah]

You'll likely want something like the curses library, which allows for terminal and input manipulation, snazzy ansi color, and the like. Google will likely have a ton of info on it.

Quzah.

[Calavera]

I have read the FAQ, and i have already understand it.
Thanks aniway.

[PING]

I have read the FAQ, and i have already understand it.
Thanks aniway.

what u mean is that u want to accept a word or something of that sort,and u also want to display it on the screen but want the output to be in #'s
e.g.
if u accept the word as ping,u want it to be displayed as ####??
is that what u want to do??

[quzah]

I have read the FAQ, and i have already understand it.
Thanks aniway.

What? I suggested you use the curses library, which is, a library for unix systems (typically) which allows for changing how the cursor works and color and screen manipulation. What does that have to do with the FAQ? *throws up hands and walks away*

Quzah.