#include <stdio.h> 
#include <ctype.h> 
 
int  main( ) { 
    char  texto[ 30 ] ; 
    printf ( "Pressione A B C para 2" ) ;      printf ( "\n Pressione D E F para 3" ) ;      printf ( "\n Pressione G H I para 4" ) ;      printf ( "\n Pressione J K L para 5" ) ;      printf ( "\n Pressione M N O para 6" ) ;      printf ( "\n Pressione P Q R S para 7" ) ;      printf ( "\n Pressione T U V para 8" ) ;      printf ( "\n Pressione W X Y Z para 9" ) ;      printf ( "\n \n Informe as letras: " ) ;      for  ( int  i =  0 ;  texto[ i]  !=  '\0 ' ;  i++ )  { 
        if  ( letra 
==  'A'  ||  texto
[ i
]  ==  'B'  ||  letra 
==  'C' )  printf ( "2" ) ;          else  if  ( letra 
==  'D'  ||  letra 
==  'E'  ||  letra 
==  'F' )  printf ( "3" ) ;          else  if  ( letra 
==  'G'  ||  letra 
==  'H'  ||  letra 
==  'I' )  printf ( "4" ) ;          else  if  ( letra 
==  'J'  ||  letra 
==  'K'  ||  letra 
==  'L' )  printf ( "5" ) ;          else  if  ( letra 
==  'M'  ||  letra 
==  'N'  ||  letra 
==  'O' )  printf ( "6" ) ;          else  if  ( letra 
==  'P'  ||  letra 
==  'Q'  ||  letra 
==  'R'  ||  letra 
==  'S' )  printf ( "7" ) ;          else  if  ( letra 
==  'T'  ||  letra 
==  'U'  ||  letra 
==  'V' )  printf ( "8" ) ;          else  if  ( letra 
==  'W'  ||  letra 
==  'X'  ||  letra 
==  'Y'  ||  letra 
==  'Z' )  printf ( "9" ) ;      } 
} 
 
//https://pt.stackoverflow.com/q/341033/101 
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