Visit Our UNIX and Linux User Community


How i can read a long integer from standar input and a string with as many characters as specified..


 
Thread Tools Search this Thread
Top Forums Programming How i can read a long integer from standar input and a string with as many characters as specified..
# 1  
Old 10-15-2009
How i can read a long integer from standar input and a string with as many characters as specified..

how i can read a long integer from standar input and a string with as many characters as specified in the number?

i thing that i must use the read command ofcourse....
# 2  
Old 10-15-2009
Code:
#include <stdlib.h>
#include <stdio.h>

int main( int argc, char **argv )
{
    int    num;
    char    format[ 8 ];
    char    inps[ 100 ];

    scanf( "%d ", &num );
    sprintf( format, "%%%ds", num );
    scanf( format, inps );
    printf( "format: '%s' -- num: %d, text: %s\n", format, num, inps );
    return( 0 );
}

# 3  
Old 10-15-2009
thnx you...


but i want to achieve this with the read command and in combination with malloc... is that possible?
# 4  
Old 10-15-2009
What is the malloc supposed to be used for? Why so specific, is this an assignment?
# 5  
Old 10-15-2009
I suppose that it might be possible but it would make more sense to use something like getchar() and have a loop like so:

while ( ( c = getchar() ) != EOF )
{
...
}

or use gets();

I am not sure of your reasons but it doesn't seem practical to use read() to read from stdin, unless I am missing something obvious.

Julian
# 6  
Old 10-15-2009
its not an assignment, its for an exercise....but i dont know how to do it with read
its something like this. read (STDIN, BUFFER, SIZE)

but the i dont know how to continue, ok


printf("GIVE NUMBER");
i = read (STDIN, BUFFER, SIZE);

with pointers after or whatever...

something like this....
# 7  
Old 10-15-2009
Let me be perfectly clear.

People who post homework and repeatedly break the homework posting rules will be banned.

Cheaters are not welcome here.

If you post homework, and do not complete the homework template completely and accurately, you will be banned.

Moderators, please enforce this important forum rule. Thank you.

Previous Thread | Next Thread
Test Your Knowledge in Computers #105
Difficulty: Easy
The programming interface, file abstraction, built-in networking and persistent background processing are all features and capabilities supported by a Unix or Linux OS.
True or False?

10 More Discussions You Might Find Interesting

1. UNIX for Beginners Questions & Answers

awk command input string too long, limit

cat filename| awk '{ $1=""; print $0}' in my file there are few lines that has more than 3000 characters per line and as soon as I run the above command it cores, strings core reveals that the awk is failing because input string too long, limit. can i get some help from the experts to find... (8 Replies)
Discussion started by: knijjar
8 Replies

2. Shell Programming and Scripting

Printf or any other method to put long string of spec characters - passing passwords

Hello, I am looking for a method to use in my bash script which allows me to use long strings with all special characters. I have found that printf method could be helpful for me but unfortunately, when I trying root@machine:~# tevar=`printf "%s%c"... (2 Replies)
Discussion started by: elxa1
2 Replies

3. Shell Programming and Scripting

Use while loop to read file and use ${file} for both filename input into awk and as string to print

I have files named with different prefixes. From each I want to extract the first line containing a specific string, and then print that line along with the prefix. I've tried to do this with a while loop, but instead of printing the prefix I print the first line of the file twice. Files:... (3 Replies)
Discussion started by: pathunkathunk
3 Replies

4. Shell Programming and Scripting

How to avoid "Too many arguments" error, when passing a long String literal as input to a command?

Hi, I am using awk here. Inside an awk script, I have a variable which contains a very long XML data in string format (500kb). I want to pass this data (as argument) to curl command using system function. But getting Too many arguments error due to length of string data(payloadBlock). I... (4 Replies)
Discussion started by: cool.aquarian
4 Replies

5. Shell Programming and Scripting

How to read from file and convert from string to integer?

Hi all, I am trying to write a script to be able to Run top command Pick the PIDs that are taking more than 90% of CPU time Get more details like what is the script name and location for that PID Script should run until I manually kill it by ctrl + C I have come up with following script... (3 Replies)
Discussion started by: pat_pramod
3 Replies

6. Shell Programming and Scripting

Read input and match string

#!/bin/ksh echo DB LIST ps -ef | grep pmon | grep -v grep | awk -F_ '{print $3}' | sort db_up=`ps -ef | grep pmon | grep -v grep | awk -F_ '{print $3}' | sort` echo echo "Enter database name from the above list" echo read ORACLE_SID echo echo Database selected is: $ORACLE_SID echo ... (10 Replies)
Discussion started by: crazy_max
10 Replies

7. Shell Programming and Scripting

how to compare string integer with an integer?

hi, how to I do this? i="4.000" if ; then echo "smaller" fi how do I convert the "4.000" to 4? Thanks! (4 Replies)
Discussion started by: h0ujun
4 Replies

8. Shell Programming and Scripting

Take input from read and place it a string in another file

Hi, This is most likely a dumb question but I could not find answer to it elsewhere. I'm building a simple menu with case /esac and want to read user's input: Please enter XYZ ; read XYZ How do I take the value of XYZ and insert it as a variable $XYZ in file file.txt ? I may need to... (9 Replies)
Discussion started by: svetoslav_sj
9 Replies

9. Shell Programming and Scripting

Using IF statements with maths where the input is not an integer

Hi All I've made a few scripts which using GDAL extract the value of a pixel within a given raster. The purpose is to work out the combine value of every pixel. I thought there may have been an easier way to do this but alas! The code below extracts the pixel value at position X Y. The... (3 Replies)
Discussion started by: StudentFitz
3 Replies

10. UNIX for Dummies Questions & Answers

Check if input is an integer or a floating point?

Hiii I actually intent to check the integer or floating point number input by user i.e. 23, 100, 55.25, 12.50 ..etc. However, when someone input strings or alpha character, my program has to show invalid input.!! Is there any Unix shell script syntax can help me to check ? Thanking you (2 Replies)
Discussion started by: krishnampkkm
2 Replies

Featured Tech Videos