Does not my file save an entire value in C ++?

My program consists in creating a file .dat , with 3 values (name, age and country), read the file and show its contents.

The problem I have is that when I open my file, it only saves me the char values. I think the error is in getchar(); , but if I do not use it, it will not let me enter the country.

#include <iostream>
#include <stdio.h>
#include <string.h>
#include <conio.h>

using namespace std;

struct Persona
    {
        char nombre[40];
        int edad;
        char pais[30];
    }est;

int main()
{
    FILE* matatero;
    matatero=fopen("agenda.dat","a+");
       puts("Ingrese el nombre: ");
       gets(est.nombre);
       fprintf(matatero,"%s",est.nombre);
       puts("Ingrese edad: ");
       scanf("%d",&est.edad);
       fscanf(matatero,"%d",&est.edad);
       getchar();
       puts("Ingrese pais: ");
       gets(est.pais);
       fputs(est.pais,matatero);
    fclose(matatero);

    matatero=fopen("agenda.dat","r");
    while(!feof(matatero))
    {
        fgets(est.nombre,40,matatero);
        puts(est.nombre);
        fscanf(matatero,"%d",&est.edad);
        printf("%d",est.edad);
        fgets(est.pais,30,matatero);
        puts(est.pais);
        cout<<endl;
    }
    fclose(matatero);

    return 0;
}

Thank you.