help with pointers, files and functions in c - c

Question

throw me 3 errors when compiling I am using Dev-C + +.
#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include <string.h>
struct agenda{
char nombre [50];
char telefono[25];
char email[50];
}
struct nodo{
struct agenda dato;
struct nodo *proximo;
}
struct nodo *nuevonodo
int colavacia(struct nodo *)
struct nodo *creacola (struct nodo *, struct agenda);
void mostrar (struct nodo *);
void main()
{
struct nodo *pri=NULL, *ult=NULL;
struct agenda x;
printf ("ingrese nombre: ");
gets(x.nombre);
while (strcmpi(x.nombre, "fin"))
{
printf ("ingrese telefono: ");
gets (x.telefono);
printf ("ingrese mail: ");
gets(x.mail);
ult=creacola(ult,x);
if (pri==NULL) pri=ult; //si es la 1 pasada pongo en pri el valor del primer nodo
printf ("ingrese nombre: ");
gets(x.nombre);
}
if (colavacia(pri)==1)
{
printf ("No se ingresaron registros");getch();
}
else mostrar(pri);
}
struct nodo *nuevonodo()
{
struct nodo *p;
p=(struct nodo *)malloc(sizeof(struc nodo));
if(p==NULL)
{
printf ("memoria ram llena");
getch();
exit(0);
}
return p;
}
struct nodo *creacola(struct nodo *ult, struct agenda x)
{
struct nodo *p;
p=nuevonodo();
(*P).dato=x;
(*p).proximo=NULL;
if(ult!=NULL) (*ult).proximo=p; //si hay nodo anterior en prox pongo la direccion del nodo actual
return p;
}
int colavacia(struct nodo *pri)
{
if(pri==NULL) return 1;
else
return 0;
}
void mostrar (struct nodo *pri)
{
struct nodo *aux;
while(pri!=NULL)
{
printf("Nombre: %s - telefono: %s - Mail: %s \n",
pri->dato.nombre,pri->dato.telefono,pri->dato.mail);
aux=pri;
pri=(*pri).proximo;
free(aux);
}
getch();
}

Answer 1

You must end a struct definition with a semicolon:
struct agenda{
char nombre [50];
char telefono[25];
char email[50];
}; // <- HERE
Similarly for variable and function declarations:
struct nodo *nuevonodo;
int colavacia(struct nodo *);
And the return value of main has type int.

Answer 2

5587527.c:2:19: fatal error: conio.h: No such file or directory
I've commented out the offending #include and tried again
5587527.c:11:5: error: two or more data types in declaration specifiers
5587527.c:16:5: error: two or more data types in declaration specifiers
5587527.c:17:12: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘int’
cc1: warnings being treated as errors
5587527.c:22:10: error: function declaration isn’t a prototype
5587527.c:22:10: error: return type of ‘main’ is not ‘int’
5587527.c: In function ‘main’:
5587527.c:22:10: error: old-style function definition
5587527.c:29:9: error: implicit declaration of function ‘strcmpi’
5587527.c:29:9: error: nested extern declaration of ‘strcmpi’
5587527.c:35:15: error: ‘struct agenda’ has no member named ‘mail’
5587527.c:36:9: error: implicit declaration of function ‘creacola’
5587527.c:36:9: error: nested extern declaration of ‘creacola’
5587527.c:36:12: error: assignment makes pointer from integer without a cast
5587527.c:41:5: error: implicit declaration of function ‘colavacia’
5587527.c:41:5: error: nested extern declaration of ‘colavacia’
5587527.c:43:5: error: implicit declaration of function ‘getch’
5587527.c:43:5: error: nested extern declaration of ‘getch’
5587527.c: At top level:
5587527.c:48:18: error: function declaration isn’t a prototype
5587527.c: In function ‘nuevonodo’:
5587527.c:48:18: error: old-style function definition
5587527.c:51:40: error: ‘struc’ undeclared (first use in this function)
5587527.c:51:40: note: each undeclared identifier is reported only once for each function it appears in
5587527.c:51:46: error: expected ‘)’ before ‘nodo’
5587527.c: At top level:
5587527.c:61:18: error: conflicting types for ‘creacola’
5587527.c:36:13: note: previous implicit declaration of ‘creacola’ was here
5587527.c: In function ‘creacola’:
5587527.c:65:11: error: ‘P’ undeclared (first use in this function)
5587527.c: In function ‘mostrar’:
5587527.c:85:54: error: ‘struct agenda’ has no member named ‘mail’
I've added a ; to lines 10, 14, 16, 17 and tried again
cc1: warnings being treated as errors
5587527.c:22:10: error: function declaration isn’t a prototype
5587527.c:22:10: error: return type of ‘main’ is not ‘int’
5587527.c: In function ‘main’:
5587527.c:22:10: error: old-style function definition
5587527.c:29:9: error: implicit declaration of function ‘strcmpi’
5587527.c:29:9: error: nested extern declaration of ‘strcmpi’
5587527.c:35:15: error: ‘struct agenda’ has no member named ‘mail’
5587527.c:43:5: error: implicit declaration of function ‘getch’
5587527.c:43:5: error: nested extern declaration of ‘getch’
5587527.c: At top level:
5587527.c:48:18: error: function declaration isn’t a prototype
5587527.c:48:18: error: ‘nuevonodo’ redeclared as different kind of symbol
5587527.c:16:18: note: previous declaration of ‘nuevonodo’ was here
5587527.c: In function ‘nuevonodo’:
5587527.c:48:18: error: old-style function definition
5587527.c:51:40: error: ‘struc’ undeclared (first use in this function)
5587527.c:51:40: note: each undeclared identifier is reported only once for each function it appears in
5587527.c:51:46: error: expected ‘)’ before ‘nodo’
5587527.c: In function ‘creacola’:
5587527.c:65:11: error: ‘P’ undeclared (first use in this function)
5587527.c: In function ‘mostrar’:
5587527.c:85:54: error: ‘struct agenda’ has no member named ‘mail’
Fix main in line 22 (to int main(void))
5587527.c: In function ‘main’:
5587527.c:29:9: error: implicit declaration of function ‘strcmpi’
5587527.c:29:9: error: nested extern declaration of ‘strcmpi’
5587527.c:35:15: error: ‘struct agenda’ has no member named ‘mail’
5587527.c:43:5: error: implicit declaration of function ‘getch’
5587527.c:43:5: error: nested extern declaration of ‘getch’
5587527.c: At top level:
5587527.c:48:18: error: function declaration isn’t a prototype
5587527.c:48:18: error: ‘nuevonodo’ redeclared as different kind of symbol
5587527.c:16:18: note: previous declaration of ‘nuevonodo’ was here
5587527.c: In function ‘nuevonodo’:
5587527.c:48:18: error: old-style function definition
5587527.c:51:40: error: ‘struc’ undeclared (first use in this function)
5587527.c:51:40: note: each undeclared identifier is reported only once for each function it appears in
5587527.c:51:46: error: expected ‘)’ before ‘nodo’
5587527.c: In function ‘creacola’:
5587527.c:65:11: error: ‘P’ undeclared (first use in this function)
5587527.c: In function ‘mostrar’:
5587527.c:85:54: error: ‘struct agenda’ has no member named ‘mail’
Changed strcmpi in line 29 to strcmp
5587527.c: In function ‘main’:
5587527.c:35:15: error: ‘struct agenda’ has no member named ‘mail’
cc1: warnings being treated as errors
5587527.c:43:5: error: implicit declaration of function ‘getch’
5587527.c:43:5: error: nested extern declaration of ‘getch’
5587527.c: At top level:
5587527.c:48:18: error: function declaration isn’t a prototype
5587527.c:48:18: error: ‘nuevonodo’ redeclared as different kind of symbol
5587527.c:16:18: note: previous declaration of ‘nuevonodo’ was here
5587527.c: In function ‘nuevonodo’:
5587527.c:48:18: error: old-style function definition
5587527.c:51:40: error: ‘struc’ undeclared (first use in this function)
5587527.c:51:40: note: each undeclared identifier is reported only once for each function it appears in
5587527.c:51:46: error: expected ‘)’ before ‘nodo’
5587527.c: In function ‘creacola’:
5587527.c:65:11: error: ‘P’ undeclared (first use in this function)
5587527.c: In function ‘mostrar’:
5587527.c:85:54: error: ‘struct agenda’ has no member named ‘mail’
...
I've done a few correct errors / recompile / get more errors for you. Now it's your turn.