#include <stdio.h>
#include <string.h>
 
int main() {
	char binario[16][5] = {"0000","0001","0010","0011","0100","0101","0110","0111","1000","1001","1010","1011","1100","1101","1110","1111"};
	char nome[10];
	printf("Insira um valor\n");
	scanf("%s", nome);
	int contador = 0;
	for (; contador < 16 && strcmp(nome, binario[contador]) != 0; contador++);
	if (contador == 16) printf("Base inicial invalida"); //essa mensagem não faz sentido com o enunciado
}
 
//https://pt.stackoverflow.com/q/154725/101

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

MDAxMQoK

0011