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Full Discussion: C first Script Question
Top Forums Programming C first Script Question Post 302751771 by jim mcnamara on Friday 4th of January 2013 12:17:36 PM
Old 01-04-2013
Code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

int main()
{
    char tmp[16]={0x0};  // read in strings it works better;
    int num=0;
    char *p;
    printf("Idjit enter a number:");
    fgets(tmp, sizeof(tmp), stdin);  // read tmp from keyboard
    //scanf("%d", &num);
    p=strchr(tmp, '\n');  // find the trailing newline character
    if(p!=NULL) *p=0x0;   // terminate the string on the \n character  
    num=atoi(tmp);    // we do not use this but here it is anyway
    if( isdigit(*tmp) )   // %d is a string, use the isdigit  
    {
        printf(" Your not an idjit. This is the number you entered %s\n",tmp);
        return(0);
    }
    if(!isdigit(*tmp) )  // it is not a digit
    {
       printf("Idjit this a letter not a number %s\n",tmp);  // you cannot print numbers that do not exist
       return(1);
    }
    else // you cannot get here from the above if() statement.
    {
       printf("Give up. You are a true Idjit");
       return(1);
    }
    
}

comments explain the changes.
This User Gave Thanks to jim mcnamara For This Post:
metallica1973
 

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LEARN ABOUT FREEBSD

copymsg

copymsg(9F)						   Kernel Functions for Drivers 					       copymsg(9F)

NAME

       copymsg - copy a message

SYNOPSIS

       #include <sys/stream.h>

       mblk_t *copymsg(mblk_t *mp);

INTERFACE LEVEL

       Architecture independent level 1 (DDI/DKI).

PARAMETERS

       mp	Pointer to the message to be copied.

DESCRIPTION

       copymsg()  forms  a  new  message  by  allocating  new message blocks, and copying the contents of the message referred to by mp (using the
       copyb(9F) function). It returns a pointer to the new message.

RETURN VALUES

       If the copy is successful, copymsg() returns a pointer to the new message.  Otherwise, it returns a NULL pointer.

CONTEXT

       copymsg() can be called from user or interrupt context.

EXAMPLES

       Example 1: : Using copymsg

       The routine lctouc() converts all the lowercase ASCII characters in the message to uppercase. If the reference count is	greater  than  one
       (line  8),  then  the  message  is shared, and must be copied before changing the contents of the data buffer. If the call to the copymsg()
       function fails (line 9), return NULL (line 10), otherwise, free the original message (line 11). If the reference count was equal to 1,  the
       message can be modified. For each character (line 16) in each message block (line 15), if it is a lowercase letter, convert it to an upper-
       case letter (line 18). A pointer to the converted message is returned (line 21).

	1 mblk_t *lctouc(mp)
	2    mblk_t *mp;
	3 {
	4    mblk_t *cmp;
	5    mblk_t *tmp;
	6    unsigned char *cp;
	7
	8    if (mp->b_datap->db_ref > 1) {
	9	     if ((cmp = copymsg(mp)) == NULL)
       10		      return (NULL);
       11	     freemsg(mp);
       12    } else {
       13	     cmp = mp;
       14    }
       15    for (tmp = cmp; tmp; tmp = tmp->b_cont) {
       16	     for (cp = tmp->b_rptr; cp < tmp->b_wptr; cp++) {
       17		     if ((*cp <= 'z') && (*cp >= 'a'))
       18			      *cp -= 0x20;
       19	     }
       20    }
       21    return(cmp);
       22 }

SEE ALSO

       allocb(9F), copyb(9F), msgb(9S)

       Writing Device Drivers

	STREAMS Programming Guide

SunOS 5.10							    27 Jun 1995 						       copymsg(9F)
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