isgraph : isgraph « ctype.h « C Tutorial

1. C Tutorial
2. ctype.h
3. isgraph

For ASCII environments, printable characters are in the range 0x21 through 0x7E.

#include <ctype.h>
  #include <stdio.h>

  int main(void)
  {
    char ch;

    for(;;) {
      ch = getchar();
      if(isgraph(ch)){
         printf("%c is printable\n", ch);
      }
      if(ch == '.'){
         break;
      }
    }
    return 0;
  }

1
1 is printable
2
2 is printable
3
3 is printable
4
4 is printable
.
. is printable