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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <malloc.h>
  4.  
  5. typedef struct cel {
  6.     char conteudo;
  7.     struct cel *prox;
  8. } celula;
  9.  
  10. typedef struct pilha {
  11.     struct cel *cabeca;
  12. } pilha;
  13.  
  14. void empilha(char c, pilha *p) {
  15.     celula *nova = malloc(sizeof(celula));
  16.     nova->conteudo = c;
  17.     nova->prox = p->cabeca;
  18.     p->cabeca = nova;
  19. }
  20.  
  21. char desempilha(pilha *p) {
  22.     celula *pt = p->cabeca;
  23.     char c = pt->conteudo;
  24.     p->cabeca = pt->prox;
  25.     free(pt);
  26.     return c;
  27. }
  28.  
  29. int main() {
  30.     char frase[50];
  31.     pilha p;
  32.     p.cabeca = NULL;
  33.     printf("Informe a frase: ");
  34.     fgets(frase, 50, stdin);
  35.     for (int i = 0; frase[i] != '\0'; i++) {
  36.         empilha(frase[i], &p);
  37.     }
  38.     printf("\nInvertida: ");
  39.     while (p.cabeca != NULL) {
  40.         putchar(desempilha(&p));
  41.     }
  42.     putchar('\n');
  43.     return 0;
  44. }
Success #stdin #stdout 0s 4528KB
comments (?)
stdin
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abcdefghijklmnopqrstuvwxyz
stdout
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Informe a frase: 
Invertida: zyxwvutsrqponmlkjihgfedcba
https://ideone.com/ysHTqV
language:
C (gcc 8.3)
created:
7 years ago
visibility:
public

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