Validando a data atual

 Este programa usa funções de bibliotecas padrões para validar
a data atual, dica muito boa para os iniciantes em Linguagem C.

Veja abaixo imagens do programa em execução:

Veja abaixo o código do programa:

#include <stdio.h>

#include <string.h>

#include <conio.h>

#include <time.h>

void Janela5 ( ) {

     int lin, col;

     col = 0;

     for ( lin = 2; lin <= 24; lin++ )

         for ( col = 2; col <= 78; col++ ) {

              gotoxy ( col, lin );

              textbackground ( WHITE );

              printf ( " " );

         }

}

int main ( void ) {

     system ( "title VALIDANDO A DATA ATUAL" );

     struct tm *tm;

     time_t t;

     char data [ 15 ];

     char da_ta [ 15 ];

     time ( &t );

     tm = localtime ( &t );

     strftime ( data, 20, "%d/%m/%Y", tm );

     textcolor ( LIGHTBLUE );

     gotoxy ( 20, 7 );

     do {

         system ( "cls" );

         Janela5 ( );

         textcolor ( LIGHTRED );

         gotoxy ( 32, 5 );

         printf ( "VALIDANDO A DATA ATUAL" );

         textcolor ( LIGHTBLUE );

         gotoxy ( 25, 7 );

         printf ( "Programa desenvolvido por:" );

         textcolor ( BLACK );

         gotoxy ( 52, 7 );

         printf ( "Samuel Lima" );

         textcolor ( LIGHTMAGENTA );

         gotoxy ( 34, 9 );

         printf ( "sa_sp10@hotmail.com" );

         textcolor ( LIGHTBLUE );

         gotoxy ( 18, 11 );

         printf ( "Digite a data de hoje no formato dd/mm/aaaa -> " );

         textcolor ( LIGHTRED );

         gets ( da_ta );

         if ( strcmp ( ( da_ta ), data ) == 0 ) {

              textcolor ( LIGHTRED );

              gotoxy ( 20, 11 );

              textcolor ( LIGHTBLUE );

              gotoxy ( 34, 13 );

              printf ( "Vc acertou " );

              textcolor ( LIGHTRED );

              printf ( "%s", data );

              textcolor ( BLACK );

              gotoxy ( 36, 23 );

              printf ( "MUITO OBRIGADO" );

              getche ( );

              exit ( 0 );

         } else {

              textcolor ( LIGHTBLUE );

              gotoxy ( 32, 13 );

              printf ( "Data ou o formato errado" );

              Sleep ( 1800 );

              textcolor ( LIGHTRED );

              gotoxy ( 35, 23 );

              printf ( "Tente outra vez" );

         }

         getche ( );

         textbackground ( BLACK );

     } while ( 1 );

}