(Language C) I’m not really able to compare if between two chars

Question

This is the initial menu code of the program:

    #include<stdlib.h>
    #include<stdio.h>
    #include<conio.c>
    #include<time.h>
    #include<locale.h>

    void inicio();
    void logar();
    void cadastrar();
    void sobre();
    void sair();
    void cadastroAdministrativo();
    
    int opcao;               
    char valor[];
    char token[] = "a";

    int main()  
    {
    setlocale(LC_ALL,"");      
    inicio();
    }       
       
    void inicio(){
    system("cls");
    printf("Bem vindo a central da coleta de dados da Secretaria Municipal de Gestão!\n");
    printf("1-Logar\n");
    printf("2-Cadastrar\n");
    printf("3-Sobre\n");
    printf("4-Sair\n");
    printf("Opção: ");
    scanf("%i",&opcao);
    switch (opcao){
          case 1:logar(); break;
          case 2:cadastroAdministrativo(); break;
          case 3:sobre(); break;
          case 4:sair(); break;
          }
    } 

and this is the part that this giving problem:

void cadastroAdministrativo(){
opcao = 1;     
do {
fflush(stdin);    
system("cls");        
printf("Por favor digite o token de administração:\n");
scanf("%c",&valor);

if (valor == token){
printf("Placeholder\n");
scanf("%i",&valor);               
} else {
system("cls");
printf("Você errou! deseja:\n");
printf("1-Tentar novamente\n");
printf("2-Voltar\n");
printf("Opção: ");
fflush(stdin);
scanf("%i",&opcao);
} } while(opcao == 1); 
inicio();
}

how you can see this function register Administrator(); it is called if I choose option 2 in the starting menu in the option variable, and when this function is called, I must enter the administration token (which would serve for the program to know if I am an administrator or not) and then he would authenticate and let me continue, the problem, is when I make this comparison

if (valor == token){
printf("Placeholder\n");
scanf("%i",&valor);               
}

regardless of what I type, the comparison returns a false result, as you can see the token in the variative declaration is "a" so I would have to type "a" to work, so even if I type it does not validate, regardless of what I type it always returns false so the program does not work as it should, is this.

Answer 1

To compare char array, use the Function strcmp, available on string.h.

You can even make a more "secure" token using a small word for example:

char token[] = "senha";
char valor[10];
....
scanf("%s",valor);

if (strcmp(token,valor == 0){
   printf("Placeholder\n");
   scanf("%i",&valor);               
} else {
  ....
}

As you can see, strcmp returns 0 (zero) when the strings are equal: https://www.cplusplus.com/reference/cstring/strcmp/

You can see it working here: insert link description here
(if you want to test, click on "Fork" and change the value to be typed in "stdin")