Ctype h C Tutorial

Item Value
Header filectype.h
Declarationint isgraph(int ch);
Returnreturns nonzero if ch is a printable character other than space or zero is returned.
For ASCII environments, printable characters are in the range 0x21 through 0x7E.

#include 
  #include 
  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