Equivalente decimal, octal e hexadecimal

#include <stdio.h>

void eqv(void) {
    char c;
    printf("\nDigite um caractere, por favor: ");
    scanf("%c", &c);
    printf("\nEntrada = %c", c);
    printf("\nDec\t= %d", c);
    printf("\nOct\t= %o", c);
    printf("\nHex\t= %x\n\n", c);
}

void main(void) {
    eqv();
}