Doubt with bool in C

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Doubt with bool in C

Asked 7 years, 6 months ago

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Well, I did this vector test, but I’m having a problem with the bool type, which never turns false and displays the message of not found.

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

int main() {

    char *palavras[] = {"maca", "uva", "pera"};
    int tamanho = sizeof(palavras) / sizeof(char *);
    int tam = tamanho;
    char nome[100];
    bool achou = false;

    while(true) {
    if(tam > 0) {
    printf("[ ");
    for(int i=0; i<tam - 1; i++) {
        printf("%s, ", palavras[i]);
    }
       printf("%s ]\n", palavras[tam - 1]);
    }
    printf("Deseja excluir qual fruta? ");
    fgets(nome, 20, stdin);
    nome[strlen(nome) - 1] = '\0';
    if(tam == 0) { puts("Sem frutas disponiveis"); break; }
    for(int i=0; i<tam; i++) {
    achou = false;
    if(!strcmp(nome, palavras[i])) {
        printf("Fruta: %s, excluida.\n\n", nome);
        for(int j=i; j<tam - 1; j++) {
            palavras[j] = palavras[j + 1];
        }
        tam--;
        achou = true;
        break;
     }
    if(achou) { //se falso
        printf("Fruta: %s, nao encontrada.\n\n", nome);
    } } }

    return 0;
}

I can’t figure it out.

Why you remove the last letter of the name of the fruit you enter, in line 24?

– Wtrmute

2017/05/24 at 20:19
Are you referring to fgets?

– Joao

2017/05/24 at 20:21
The line immediately below the fgets()

– Wtrmute

2017/05/24 at 20:29
name[strlen(name) - 1] = ' 0'; but this will remove the ' n', without it the comparison would not work.

– Joao

2017/05/24 at 20:31
You are right; it is the gets() that did not inculcate the return car in the string that returns. I compiled your code here and it worked correctly, however. There seems to be no error in it.

– Wtrmute

2017/05/24 at 20:46
if (achou) { // se falso shouldn’t be if (!achou) { // se falso ? And maybe you should be out for that if.

– lemoce

2017/05/24 at 20:55

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by lemoce • **661** points · Answer 1 · 2017-05-24T21:00:03+00:00

I edited your program

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

int main()
{

  char *palavras[] = {"maca", "uva", "pera"};
  int tamanho = sizeof(palavras) / sizeof(char *);
  int tam = tamanho;
  char nome[100];
  bool achou = false;
  while(true)
    {
      if(tam > 0)
        {
          printf("[ ");
          for(int i=0; i<tam - 1; i++)
            {
              printf("%s, ", palavras[i]);
            }
          printf("%s ]\n", palavras[tam - 1]);
        }
      printf("Deseja excluir qual fruta? ");
      fgets(nome, 20, stdin);
      nome[strlen(nome) - 1] = '\0';
      if(tam == 0)
        {
          puts("Sem frutas disponiveis");
          break;
        }
      for(int i=0; i<tam; i++)
        {
          achou = false;
          if(!strcmp(nome, palavras[i]))
            {
              printf("Fruta: %s, excluida.\n\n", nome);
              for(int j=i; j<tam - 1; j++)
                {
                  palavras[j] = palavras[j + 1];
                }
              tam--;
              achou = true;
              break;
            }
        }
      if(!achou) // retirado de dentro do for e na negativa
        { //se falso
          printf("Fruta: %s, nao encontrada.\n\n", nome);
        }
    }
    return 0;
}