Posts by jephthah Page 15

jephthah 1,888 Posting Maven

15 Years Ago

try this

#include <stdio.h>
#include <string.h>

int main(void)
{
    char myString[32];
    int length, i;

    strcpy(myString,"Hello World!");
    length = strlen(myString);

    for (i=0; i<length; i++)
    {
       printf("index %02d :   %c    0x%02x\n", i, myString[i], myString[i]);
    }

    return 0;
}

Software Development c

jephthah 1,888 Posting Maven

15 Years Ago

Re: weird error...help!

Add this right after your scanf()'s:
getchar();

this is wrong. its sloppy and it barely addresses the problem. in practice, with more complex inputs, it will fail more often than it works.

if the user enters a number followed by enter, like this: "12\n" , adak's suggestion will work

but if the user input diverges from that in the slightest (and it will) ... if they enter other stuff after the number (a "\tab" or a space " " or some other input), like this: "12 \n" ... it will still fail to work correctly.

do not use scanf. use fgets to a string, then convert the string to an integer, long, float or double using "atoi" "atol" "atof" or "atod"... even better are the functions "strtol" and "strtod"

Software Development c

jephthah 1,888 Posting Maven

15 Years Ago

Re: weird error...help!

the quick answer is that youve got unbuffered input due to your use of scanf()

but you've got a number of bad programming practices here, that i can't ignore. I suspect the blame is due to incompetent instructors teaching substandard curriculum on compilers that are 15 years out-of-date.

So I'm just going to lay it out, and if you choose not to take this advice ... well, at least I told you.

the non-standard <conio.h> library is obsolete. cease using it. this means that you will not be able to use things like "textcolor" which is unnecessary now that the days of DOS has been over for at least 10 years, and "clrscr" which is always obnoxious. you will not be able to use "getch" either, but don't worry the standard-C library <stdio.h> has "getchar" which will suffice. But you'll really want to use "fgets" anyhow, for most console input.

do not use "exit()" to quit a program due to normal events. this is a terrible practice, and will cause all sorts of problems once you start writing real programs that interface with real hardware and live databases.

steer away from using scanf(). the lure is tempting, but you need to learn to avoid it. its the source of many problems. fgets() will get a string safely that can be converted to numeric value and allows a relatively easy error-checking method to ensure the input buffer is cleared in case input is too long. (i'm …

Software Development c

urbangeek commented: Awsome...thanks!! +0

jephthah 1,888 Posting Maven

15 Years Ago

Re: Runtime error

do not make it global. that is not good advice, and doesnt fix the root of your problem.

i do agree that you need to use fgets(), instead of scanf(), because scanf() should never be used to input strings. scanf will not accept anything further once you pass in a whitespace.

your real problem here is that in your string size of 100 characters, everything beyond the end of the input string is garbage, and your reverse function is attempting to print all that garbage.

say you enter the string (using fgets!) that reads "hello how are you". this gives a string of length 18 characters: the 17 characters and spaces, plus the newline character. (note that you would need a char[] array of 19 to hold it because of the guaranteed terminating Null character.)

the remaining 81 characters is random garbage. you do not want to print those, you only want to print the first 17 characters that are valid.

do something like this in your "reverse()" function:

length = strlen(str);
    if (str[length-1] == '\n')
    {
        str[length-1] = '\0';
        length--;
    }
    for(i=length-1;i>=0;i--)
    {
        printf("%c",str[i]);
    }

Note: "strlen()" requires that you include the <string.h> library.

Software Development c

jephthah 1,888 Posting Maven

15 Years Ago

Re: help wid a programme

in your "count()" function within the body of the "for" loop, test if the character is a space ' '. if the character is a space, then break out of the for loop early by using the "break" command.

if you want to be thorough, test also for \newlines and \tabs

if (c == ' ' || c == '\n' || c == '\t')
   break;

finally, make a nominal effort to spell words correctly. you are not posting from a SMS texting cellphone, so typing "wut" and "wud" and "tat" and "wen" makes you look like a goddamn willful retard. If you do it anymore, i'm never going to help you again.

Software Development c

jephthah 1,888 Posting Maven

15 Years Ago

Re: hello everyone

sounds like you have a good program. we had a "co op" program that allowed work-study, but it was optional and many people didnt do it because it delayed graduation by a year.

i graduated right after the tech bubble popped and a lot of experienced developers were out of work. it was a very anxious time. i spent my last semester sending out scores of resumes and letters and filling out applications. as it turned out, i got hired right before i graduated, and was able to start right away.

since getting my BSEE, ive worked in a few different industries: construction, telecom, scientific instruments, and now medical devices.... i'd like to stay in medical devices. i find it challenging, rewarding, and i feel it has a sense of social purpose.

the thing about that first job, it will really determine the course of your career. yes, you can change paths later, but it becomes more and more difficult. I would recommend that you take that first position in the industry want to be in and doing the kind of work you like, and not just taking a job because it's available.

good luck. :)