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Displaying printable characters plus whitspace names

#include <stdio.h> #include <ctype.h> void main() {   int i = 0;                         /* Loop counter         */   char ch = 0;                       /* Character code value */   for(i = 0 ; i<128 ; i++)   {     ch = (char)i;     if(ch%2==0)       printf("\n");     printf("  %4d",ch);     if(isgraph(ch))       printf("               %c",ch);     else       switch(ch)     {         case '\n':            printf("         newline",ch);            break;         case ' ':            printf("           space",ch);            break;         case '\t':            printf("  horizontal tab",ch);            break;         case '\v':            printf("    vertical tab",ch);            break;          case '\f':            printf("       form feed",ch);            break;         default:            printf("                ");            break;     }   }   printf("\n"); }