Implement the isgraph() : C

Hello, I am the student of the Bsc-IT. I had learned the C language in first year of Bsc-IT. I can know about the functions in C language. I have to submit the assignment on the isgraph() function. So, I would like to know about the isgraph() function. I would also like to know how can I Implement the isgraph() function in C language. If there is anyone who can have the solution on the isgraph() functions then reply me!!!

Hi, The isgraph() function can checks except space for any printable character. The isgraph() function can be the member of the <ctype.h> header file. The isgraph() function can returns the zero if the argument of the isgraph() function can not be a printable character code. And returns the space or zero if the argument of the isgraph() function can be a printable character code. The following can be the syntax of the isgraph() function in the C language :

Code:

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#include <ctype.h>
int isgraph( int d );

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Program :

Code:

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#include <ctype.h>
#include <stdio.h>
  int main(void)
 {
    char C;
    for(;;) {
      C = getchar();
      if(isgraph(C)){
        printf("%c is printable\n", C);
      }
      if(C == '.'){
        break;
      }
    }
    return 0;
  }

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Output :

Code:

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

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The following example of the isgraph() function can demonstrates you the working of the isgraph() function :

Code:

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#include <stdio.h>
#include <ctype.h>
char ch[] = {'C', 0x09, ' ', 0x7d};
#define SIZE sizeof( ch ) / sizeof( char )
void main()
  {
    int k;
    for( k = 0; k < SIZE; k++ ) {
      printf( "Char %c is %sa printable character\n",
        ch[k],
        ( isgraph( ch[k] ) ) ? "" : "not " );
    }
  }

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Output :

Code:

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Char C is a printable character
Char    is not a printable character
Char  is not a printable character
Char } is a printable character

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Except than the ' ' space the isgraph() function can checks for any character that can be printable. Whenever the argument can not be a printable character then the isgraph() function can returns the zero. And When the argument can be a printable character then the isgraph() function can returns the non zero.
I hope you can understand about the isgraph() function from the above description.