#include <stdio.h>
#include <stdlib.h>  // contem int atoi()
#include <ctype.h>  // contem int toascii(int)

int main(){
char c;
int j;

c='A';
printf("difer a-A= %d\n", 'a'-'A');
printf("difer A-a= %d\n", 'A'-'a');

printf("'A'=  %d ", 'A');
printf("'a'=  %d ", 'a');
printf("'1'=  %d\n", '1');

printf("int depois de executar atoi() =  %d\n", atoi("1234"));

printf("\n//");
for(j=32;j<127;j++){
  printf("%3d='%c' ", j,toascii(j));
  if( (j%5==0) ) printf("\n//");
}
printf("\n//");

// 126 e' DEL
// 125 ate' 159 nao da' para exibir 

for(j=160;j<256;j++){
  printf("%3d='%c' ", j, j);
  if( (j%5==0) ) printf("\n//");
}
printf("\n//");
}

/////////////////////////////////////////////
difer a-A= 32
difer A-a= -32
'A'=  65 'a'=  97 '1'=  49
int depois de executar atoi() =  1234

// 32=' '  33='!'  34='"'  35='#' 
// 36='$'  37='%'  38='&'  39='''  40='(' 
// 41=')'  42='*'  43='+'  44=','  45='-' 
// 46='.'  47='/'  48='0'  49='1'  50='2' 
// 51='3'  52='4'  53='5'  54='6'  55='7' 
// 56='8'  57='9'  58=':'  59=';'  60='<' 
// 61='='  62='>'  63='?'  64='@'  65='A' 
// 66='B'  67='C'  68='D'  69='E'  70='F' 
// 71='G'  72='H'  73='I'  74='J'  75='K' 
// 76='L'  77='M'  78='N'  79='O'  80='P' 
// 81='Q'  82='R'  83='S'  84='T'  85='U' 
// 86='V'  87='W'  88='X'  89='Y'  90='Z' 
// 91='['  92='\'  93=']'  94='^'  95='_' 
// 96='`'  97='a'  98='b'  99='c' 100='d' 
//101='e' 102='f' 103='g' 104='h' 105='i' 
//106='j' 107='k' 108='l' 109='m' 110='n' 
//111='o' 112='p' 113='q' 114='r' 115='s' 
//116='t' 117='u' 118='v' 119='w' 120='x' 
//121='y' 122='z' 123='{' 124='|' 125='}' 
//126='~' 
//160=' ' 
//161='¡' 162='¢' 163='£' 164='¤' 165='¥' 
//166='¦' 167='§' 168='¨' 169='©' 170='ª' 
//171='«' 172='¬' 173='­' 174='®' 175='¯' 
//176='°' 177='±' 178='²' 179='³' 180='´' 
//181='µ' 182='¶' 183='·' 184='¸' 185='¹' 
//186='º' 187='»' 188='¼' 189='½' 190='¾' 
//191='¿' 192='À' 193='Á' 194='Â' 195='Ã' 
//196='Ä' 197='Å' 198='Æ' 199='Ç' 200='È' 
//201='É' 202='Ê' 203='Ë' 204='Ì' 205='Í' 
//206='Î' 207='Ï' 208='Ð' 209='Ñ' 210='Ò' 
//211='Ó' 212='Ô' 213='Õ' 214='Ö' 215='×' 
//216='Ø' 217='Ù' 218='Ú' 219='Û' 220='Ü' 
//221='Ý' 222='Þ' 223='ß' 224='à' 225='á' 
//226='â' 227='ã' 228='ä' 229='å' 230='æ' 
//231='ç' 232='è' 233='é' 234='ê' 235='ë' 
//236='ì' 237='í' 238='î' 239='ï' 240='ð' 
//241='ñ' 242='ò' 243='ó' 244='ô' 245='õ' 
//246='ö' 247='÷' 248='ø' 249='ù' 250='ú' 
//251='û' 252='ü' 253='ý' 254='þ' 255='ÿ' 
//