Help pls

[warm hinge]

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

define N 50

int main(){
//variaveis
char bdNomec[N];
char bdSenhac[N];
char bdNomel[N];
char bdSenhal[N];
char bdNome_armz[N];
char bdSenha_armz[N];
int opc;
int loop;
//loop
do{
//opcao login ou entrada
printf("Banco de dados\nSelecione a opcao de entrada\n(1)Login (2)Cadastro:");
scanf("%d", &opc);
//cadastro
if(opc == 1){

    printf("Introduza o seu nome: ");
    gets(bdNomec);
    fflush(stdin);
    printf("Introduza o sua senha: ");
    gets(bdSenhac);
    fflush(stdin);
    
    if(strcmp(bdNomec, bdNome_armz) == 0){
        printf("Nome ja existente"); continue;
    }
    else{
        printf("Cadastro realizado com sucesso !");
        strcpy(bdNome_armz, bdNomec);
        strcpy(bdSenha_armz, bdSenhac);
    }
    
}
//login
else if(opc == 2){
    printf("Nome: ");
    gets(bdNomel);
    fflush(stdin);
    printf("Senha: ");
    gets(bdSenhal);
    fflush(stdin);
    if(strcmp(bdNomel, bdNome_armz) == 0){
        printf("Nome confirmado !");
    }
    else if(strcmp(bdSenha_armz, bdNomel) == 0){
        printf("Senha confirmada !\nLogin realizado com sucesso ");
    }
    else{
        printf("Nome e senha incorrectos !");
    }
}
//saida de erro no caso de entrada de opcao incorrecta
else{
    printf("Opcao invalida !"); return 0;
}

//fim do loop
printf("Introduza (1) se pretende continuar e (2) para parar: ");
scanf("%d", &loop);
fflush(stdin);
}while(loop == 1);
}

[cedar vapor]

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[warm hinge]

!howto ask

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[zenith pumice]

!f

[cedar vapor]

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

#define N 50

int main() {
  // variaveis
  char bdNomec[N];
  char bdSenhac[N];
  char bdNomel[N];
  char bdSenhal[N];
  char bdNome_armz[N];
  char bdSenha_armz[N];
  int opc;
  int loop;
  // loop
  do {
    // opcao login ou entrada
    printf(
        "Banco de dados\nSelecione a opcao de entrada\n(1)Login (2)Cadastro:");
    scanf("%d", &opc);
    // cadastro
    if (opc == 1) {
      printf("Introduza o seu nome: ");
      gets(bdNomec);
      fflush(stdin);
      printf("Introduza o sua senha: ");
      gets(bdSenhac);
      fflush(stdin);

      if (strcmp(bdNomec, bdNome_armz) == 0) {
        printf("Nome ja existente");
        continue;
      } else {
        printf("Cadastro realizado com sucesso !");
        strcpy(bdNome_armz, bdNomec);
        strcpy(bdSenha_armz, bdSenhac);
      }

    }
    // login
    else if (opc == 2) {
      printf("Nome: ");
      gets(bdNomel);
      fflush(stdin);
      printf("Senha: ");
      gets(bdSenhal);
      fflush(stdin);
      if (strcmp(bdNomel, bdNome_armz) == 0) {
        printf("Nome confirmado !");
      } else if (strcmp(bdSenha_armz, bdNomel) == 0) {
        printf("Senha confirmada !\nLogin realizado com sucesso ");
      } else {
        printf("Nome e senha incorrectos !");
      }
    }
    // saida de erro no caso de entrada de opcao incorrecta
    else {
      printf("Opcao invalida !");
      return 0;
    }

    // fim do loop
    printf("Introduza (1) se pretende continuar e (2) para parar: ");
    scanf("%d", &loop);
    fflush(stdin);
  } while (loop == 1);
}

PaoComManteiga

Formatted by Adler

[zenith pumice]

• fflush(stdin) - is wrong (and undefined behavior by the standard)
• gets is deprecated and shouldn't be used
• *gets & scanf don't play well together. unless you know the quirks of scanf i suggest you won't use them both in the same program. use either scanf or fgets throught the entire program

[warm hinge]

oh ok ty

but wait one question how i clean the buffer ?

and why i shouldnt use "gets" ?

[zenith pumice]

add a whitespace to your format string in your scanf calls

[cedar vapor]

Handling Whitespace in scanf

When the user presses space or enter in the console, this puts ' ' and '\n' whitespace characters into stdio respectively. When reading an int* with %d or float* with %f, scanf skips any leading whitespace. However, %c for char* extracts whitespace characters.

Example Problem

Say the user enters " 70 f", and we want to read 70 and f into int and char respectively:

int x; char c;
scanf("%d", &x); // OK,  x = 70
scanf("%c", &c); // BAD, c = ' '

Instead of reading f, we read a space, because %c does not skip leading whitespace. Solution:

scanf(" %c", &c);

The leading space before %c matches any whitespace of any length.

See Also

• cdecl+ - online tool for explaining scanf

[zenith pumice]

it has no mechanism to protect against buffer overflow

[warm hinge]

oh thx

[cedar vapor]

@warm hinge Has your question been resolved? If so, type !solved :)

[warm hinge]

!solved