C / How to exchange for a while?

Question

Write the function prints using the while repeat structure instead of for. If necessary I can edit and insert all the code.

---

void imprime(Ccc *p)
{
    Ccc *r;
    for (r = p; r!=NULL; r = r->proximo)
        printf("%c",r->caracter);
}

---

Complete

#include <stdio.h>
#include <stdlib.h>

typedef struct ccc {
    char caracter;
    struct ccc *proximo;
} Ccc;

void imprime(Ccc *p)
{
    Ccc *r;
    for (r = p; r!=NULL; r = r->proximo)
        printf("%c",r->caracter);
}

void liberar_memoria(Ccc *p)
{
    Ccc *q, *r;
    q = p;
    while (q!=NULL) {
        r = q->proximo;
        free(q);
        q = r;
    }
}

main()
{
    Ccc *p1, *p2, *p3;

    p1=(Ccc *)malloc(sizeof(Ccc));
    p2=(Ccc *)malloc(sizeof(Ccc));
    p3=(Ccc *)malloc(sizeof(Ccc));

    if ((p1==NULL)||(p2==NULL)||(p3==NULL)) 
        return;

    p1->caracter='A';
    p1->proximo=p2;

    p2->caracter='L';
    p2->proximo=p3;

    p3->caracter='O';
    p3->proximo=NULL;

    imprime(p1);
    liberar_memoria(p1);
 }

Answer 1

The difference between the for and the while, is that the for allows you to assign and declare variables only within that scope, so the for will perform both the condition check and the "indicator" update automatically, no need to place within the scope

while will only check a simple condition and already go to the scope, so any assignment or variable statement should be made after the format

while (condição){ 
   (escopo);
}

then your code will be:

 void imprime(Ccc *p){
    Ccc *r;
    r = p;
    while(r!=NULL;){
      printf("%c",r->caracter);
      r = r->proximo;
    }
 }