#include <stdio.h>
 
int main(void) {
    int contador = 0;
    int d[16];
    printf("Digite o número do seu cartão de crédito:\n");
    long number_cartao;
    scanf("%ld", &number_cartao);
    printf("%ld\n", number_cartao);
    while (number_cartao != 0) {
        number_cartao /= 10;
        d[++contador] = number_cartao;
    }
    printf("Seu cartão tem %d números.\n", contador);
    printf("Item 0: %d", d[0]);
}
 
//https://pt.stackoverflow.com/q/451142/101

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

MTAwCg==

100