C/ctype.h/isgraph

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int isgraph(int ch)

    
//Declaration:  int isgraph(int ch); 
//Return:       returns nonzero if ch is a printable character other than space or zero is returned. 
 
  #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
*/