You've got double quotes when you need single quotes:
The " " is a pointer to a string (of a single blank) while input_message[output] is a single character (converted to int for comparison).
Also, the statement input_message != " " won't ever evaluate to true, as you're comparing two pointers and not what the pointers reference. Have a look at strcmp() and strncmp() functions which I think will do what you want in this situation.
There may be other issues; I didn't look all that closely.
I have a class with an integer pointer, which I have not initialized to NULL in the constructor. For example:
class myclass
{
private:
char * name;
int *site;
}
myclass:: myclass(....)
: name(NULL)
{
.....
}
other member function “delete “ the variable before... (2 Replies)
I received a warning when I tried to compile my program that said:
warning: comparison between pointer and integer
Could you please explain to me what this means, and in what ways I could possibly fix this?
Thanks for your help! (2 Replies)
A question to ask.
seq1 = "eeeeeeeeeeeeeeeeee";
seq2 = "dddddddddddddddddddd";
char a = '*';
strcat(*seq2, &a);
strcat(*seq1, seq2);
compilation
warning: passing arg 1 of `strcat' makes pointer from integer without a cast
thanks (4 Replies)
If one wants to get a start address of a array or a string or a block of memory via a function, there are at least two methods to achieve it:
(1) one is to pass a pointer-to-pointer parameter, like:
int my_malloc(int size, char **pmem)
{
*pmem=(char *)malloc(size);
if(*pmem==NULL)... (11 Replies)
Hi,
I am just trying to compare integer in ksh. can you please tell me what's wrong with this code... or give me suggestions on alternative.
sample code:
i=0;
if ; then
echo inside if
fi
Thanks in advance! (6 Replies)
I'm trying to write a programme which scans strings to find how many vowels they contain. I get an error saying that I'm trying to compare a pointer and an integer inif(*v == scanme){. How can I overcome this ? Also, the programme seems to scan only the first word of a string e.g.: if I type "abc... (1 Reply)
Hi
What is the difference between following commands
Command1
length=1
if ] ; then
echo "Hellow world"
fi
Command 2
length=1
if ] ; then
echo "Hellow world"
fi
which is correct usage from this (2 Replies)
I am trying to execute something like this
file=/tmp/test.txt
firstline=$(head -n 1 $file)
value=`echo $firstline | cut -d'=' -f2`
if
then
echo true
fi
i read the first line of a file, cut to the numeric value in the first line and check if it greater than 2
but for some... (11 Replies)
Hi all, I'm new programming in C, so I had the next message in my code:
Dual.c:88:20: warning: pointer type mismatch in conditional expression : &clientSa.sin6.sin6.sin6_addr,
Any help would be great
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include... (1 Reply)
Discussion started by: godna
1 Replies
LEARN ABOUT OSX
strncmp
STRCMP(3) BSD Library Functions Manual STRCMP(3)NAME
strcmp, strncmp -- compare strings
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <string.h>
int
strcmp(const char *s1, const char *s2);
int
strncmp(const char *s1, const char *s2, size_t n);
DESCRIPTION
The strcmp() and strncmp() functions lexicographically compare the null-terminated strings s1 and s2.
The strncmp() function compares not more than n characters. Because strncmp() is designed for comparing strings rather than binary data,
characters that appear after a '