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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
typedef struct agenda {
	char nome[10], email[15]; fone[9];
	struct agenda *prox;
}Tagen;
 
void insere(Tagen **L, char nome[]);
Tagen* busca(Tagen *L, char nome[]);
void remover(Tagen **L, char nome[]);
void listar(Tagen *L);
void exibir(Tagen **L, char nome[]);
void alterar(Tagen **L, char nome[]);
void excluir(Tagen **L);//toda lista
 
 
 
int main() {
	Tagen *lista = NULL, aux;
	char op, nome[10];
 
	do {
		printf("1-inserir 2-remover 3-exibir 4-alterar contato 5- listar todos os contatos 6-sair\n");
		op=getchar(); fflush(stdin);
		switch (op) {
		case '1':
			printf("nome\n");
			gets(nome);
			insere(&lista, nome);
			break;
		case '2':
			printf("nome\n");
			gets(nome);
			remover(&lista, nome);
			break;
		case '3':
			printf("nome\n");
			gets(nome);
			exibir(&lista, nome);
			break;
		case '4':
			printf("nome\n");
			gets(nome);
			alterar(&lista, nome);
			break;
		case '5':
			listar(lista);
			break;
		case '6':
			printf("FIM de programa\n");
			break;
		default:
			printf("invalido\n");
		}
	} while (op != '6');
	excluir(&lista);
 
	return 0;
}
 
void insere(Tagen **L, char nome[]) {
	Tagen *novo, *aux1, *aux2;
	if (*L == NULL) {
		novo = (Tagen*)malloc(sizeof(Tagen));
		printf("Digite o fone:\n");
		gets(novo->fone);
		printf("Digite o email:\n");
		gets(novo->email);
		strcpy(novo->nome, nome);
		novo->prox = NULL;
		*L = novo;
	}
	else if (busca(*L, nome) != NULL) {
		printf("contato ja existente\n");
	}
	else {
		if (strcmp((*L)->nome, nome) < 0 && (*L)->prox == NULL) {
			novo = (Tagen*)malloc(sizeof(Tagen));
			printf("Digite o fone:\n");
			gets(novo->fone);
			printf("Digite o email:\n");
			gets(novo->email);
			strcpy(novo->nome, nome);
			novo->prox = NULL;
			(*L)->prox = novo;
		}
		else {
			aux1 = *L;
			aux2 = aux1->prox;
			while (aux2 != NULL) {
				if (strcmp(aux1->nome, nome) > 0) {
					novo = (Tagen*)malloc(sizeof(Tagen));
					printf("Digite o fone:\n");
				gets(novo->fone);
					printf("Digite o email:\n");
					gets(novo->email);
					strcpy(novo->nome, nome);
					aux1->prox = novo;
					novo->prox = aux2;
					printf("inserido\n");
					return;
				}
				else {
					aux1 = aux2;
					aux2 = aux2->prox;
				}
			}
		}
	}
}
 
Tagen *busca(Tagen *L, char nome[]) {
	Tagen *aux;
 
	if (L == NULL) 
		return NULL;
	else{
		aux = L;
		while (L != NULL) {
			if (strcmp(aux->nome, nome) == 0) 
				return aux;
			else if (strcmp(aux->nome,nome)>0) 
				return NULL;
			else 
				L = L->prox;
		}
	}
	return NULL;
}
 
void remover(Tagen **L, char nome[]) {
	Tagen *aux1, *aux2;
	if (*L == NULL) {
		printf("lista vazia");
	}
	else if ((*L)->prox == NULL) {
		if (strcmp((*L)->nome, nome) == 0) {
			free(*L);
			*L == NULL;
		}
		else {
			printf("contato nao cadastrado\n");
		}
	}
	else {
		if (strcmp((*L)->nome, nome) == 0) {
			aux1 = *L;
			*L = (*L)->prox;
			free(aux1);
		}
		else {
			aux1 = *L;
			aux2 = aux1->prox;
			while (aux2 != NULL) {
				if (strcmp(aux2->nome, nome) == 0) {
					aux1->prox = aux2->prox;
					free(aux2);
					return;
				}
				else {
					aux1 = aux2;
					aux2 = aux2->prox;
				}
			}
		}
	}
}
 
void listar(Tagen *L) {
	if (L == NULL) {
		printf("Vazia\n");
	}
	else {
		while (L != NULL) {
			puts(L->fone);
			puts(L->nome);
			puts(L->email);
			L = L->prox;
		}
	}
}
 
void exibir(Tagen **L, char nome[]) {
	Tagen *aux;
	aux = busca(*L, nome);
	if (aux == NULL) {
		printf("contato nao achado\n");
	}
	else {
		puts(aux->fone);
		puts(aux->nome);
		puts(aux->email);
	}
}
 
void alterar(Tagen **L, char nome[]) {
	Tagen *aux;
	aux = busca(*L, nome);
	if (aux == NULL) {
		printf("contato nao achado\n");
	}
	else {
		printf("Digite o numero\n");
		scanf("%d", &aux->fone);
		printf("digite o email\n");
		gets(aux->email);
	}
}
 
void excluir(Tagen **L) {
	Tagen *aux; aux = *L;
	if (*L != NULL) {
		while (*L != NULL) {
			aux = *L; *L = (*L)->prox;
			free(aux);
		}
	}
}

prog.c:6:28: error: expected specifier-qualifier-list before ‘fone’
  char nome[10], email[15]; fone[9];
                            ^~~~
prog.c: In function ‘main’:
prog.c:30:4: warning: implicit declaration of function ‘gets’ [-Wimplicit-function-declaration]
    gets(nome);
    ^~~~
prog.c:21:23: warning: unused variable ‘aux’ [-Wunused-variable]
  Tagen *lista = NULL, aux;
                       ^~~
prog.c: In function ‘insere’:
prog.c:68:12: error: ‘Tagen {aka struct agenda}’ has no member named ‘fone’; did you mean ‘nome’?
   gets(novo->fone);
            ^~
prog.c:72:7: error: ‘Tagen {aka struct agenda}’ has no member named ‘prox’
   novo->prox = NULL;
       ^~
prog.c:79:43: error: ‘Tagen {aka struct agenda}’ has no member named ‘prox’
   if (strcmp((*L)->nome, nome) < 0 && (*L)->prox == NULL) {
                                           ^~
prog.c:82:13: error: ‘Tagen {aka struct agenda}’ has no member named ‘fone’; did you mean ‘nome’?
    gets(novo->fone);
             ^~
prog.c:86:8: error: ‘Tagen {aka struct agenda}’ has no member named ‘prox’
    novo->prox = NULL;
        ^~
prog.c:87:8: error: ‘Tagen {aka struct agenda}’ has no member named ‘prox’
    (*L)->prox = novo;
        ^~
prog.c:91:15: error: ‘Tagen {aka struct agenda}’ has no member named ‘prox’
    aux2 = aux1->prox;
               ^~
prog.c:96:14: error: ‘Tagen {aka struct agenda}’ has no member named ‘fone’; did you mean ‘nome’?
     gets(novo->fone);
              ^~
prog.c:100:10: error: ‘Tagen {aka struct agenda}’ has no member named ‘prox’
      aux1->prox = novo;
          ^~
prog.c:101:10: error: ‘Tagen {aka struct agenda}’ has no member named ‘prox’
      novo->prox = aux2;
          ^~
prog.c:107:17: error: ‘Tagen {aka struct agenda}’ has no member named ‘prox’
      aux2 = aux2->prox;
                 ^~
prog.c: In function ‘busca’:
prog.c:127:10: error: ‘Tagen {aka struct agenda}’ has no member named ‘prox’
     L = L->prox;
          ^~
prog.c: In function ‘remover’:
prog.c:138:15: error: ‘Tagen {aka struct agenda}’ has no member named ‘prox’
  else if ((*L)->prox == NULL) {
               ^~
prog.c:141:7: warning: statement with no effect [-Wunused-value]
    *L == NULL;
       ^
prog.c:150:13: error: ‘Tagen {aka struct agenda}’ has no member named ‘prox’
    *L = (*L)->prox;
             ^~
prog.c:155:15: error: ‘Tagen {aka struct agenda}’ has no member named ‘prox’
    aux2 = aux1->prox;
               ^~
prog.c:158:10: error: ‘Tagen {aka struct agenda}’ has no member named ‘prox’
      aux1->prox = aux2->prox;
          ^~
prog.c:158:23: error: ‘Tagen {aka struct agenda}’ has no member named ‘prox’
      aux1->prox = aux2->prox;
                       ^~
prog.c:164:17: error: ‘Tagen {aka struct agenda}’ has no member named ‘prox’
      aux2 = aux2->prox;
                 ^~
prog.c: In function ‘listar’:
prog.c:177:10: error: ‘Tagen {aka struct agenda}’ has no member named ‘fone’; did you mean ‘nome’?
    puts(L->fone);
          ^~
prog.c:180:9: error: ‘Tagen {aka struct agenda}’ has no member named ‘prox’
    L = L->prox;
         ^~
prog.c: In function ‘exibir’:
prog.c:192:11: error: ‘Tagen {aka struct agenda}’ has no member named ‘fone’; did you mean ‘nome’?
   puts(aux->fone);
           ^~
prog.c: In function ‘alterar’:
prog.c:206:19: error: ‘Tagen {aka struct agenda}’ has no member named ‘fone’; did you mean ‘nome’?
   scanf("%d", &aux->fone);
                   ^~
prog.c: In function ‘excluir’:
prog.c:216:23: error: ‘Tagen {aka struct agenda}’ has no member named ‘prox’
    aux = *L; *L = (*L)->prox;
                       ^~

Standard output is empty