1) You cannot tell scanf how big your buffer is. If someone types in 11 characters, it will overflow and do weird things to the memory beyond your buffer, whatever it may be.
2) scanf can leave information in the buffer, especially when you use things besides %s, which ends up being really annoying, having to fflush() all the time.
What I would do instead is use fgets(). It reads entire lines at a time, into a buffer of known size.
...and if you need to use scanf to parse integers and the like, use sscanf on that buffer. sscanf(line, "%d %d %d", &inta, &intb, &intc);
plx help to solve these problems??
1. Create a HERE document which will edit multiple files in the same directory, using the ed editor. I give you 3 original files: file1.c , file2.c , file3.c, download them and change each string "stdio.h" to "STDIO.H" in these files. Note: when execute the... (1 Reply)
i am having a string like
" X1 " ---> string lenght is 30
I have stored this to a chararry . ref
so here ref = " X1 "
now i trim the left space by my function . Si the string now becomes
"X1 " ---> string lenght is 15... (3 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)
Hello experts,
please help me as i want to learn the networking concepts in details ,
as i come know Unix network programming by Richard Stevens volume 1,2
is good please any of you downloaded the Free PDF version of it please direct m e as i want to download these books or the pdf form of it,... (1 Reply)
hello all,
my question is not about How code can be rewritten, i just wanna know even though i am not using read only memory of C (i have declared str) why this function gives me segfault :wall:and the other code executes comfortably though both code uses same pointer arithmetic.
... (4 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)
I have a problem with scanf() for string pointer as member of a struct.
#include <stdio.h>
#include <stdlib.h>
struct Student {
int studentNumber;
int phoneNumber;
char *studentName; //line 7
// char studentName; //line 8
};
int... (10 Replies)
Hello, I am trying to reverse complement one string and reverse another (NO complement!), both with pointer. My code compiled without error, but did not do the job I wanted.
#include <stdio.h>
#include <stdlib.h>
#include <zlib.h>
#include "kseq.h"
// STEP 1: declare the type of file... (5 Replies)
Discussion started by: yifangt
5 Replies
LEARN ABOUT REDHAT
fgets
GETS(3) Linux Programmer's Manual GETS(3)NAME
fgetc, fgets, getc, getchar, gets, ungetc - input of characters and strings
SYNOPSIS
#include <stdio.h>
int fgetc(FILE *stream);
char *fgets(char *s, int size, FILE *stream);
int getc(FILE *stream);
int getchar(void);
char *gets(char *s);
int ungetc(int c, FILE *stream);
DESCRIPTION
fgetc() reads the next character from stream and returns it as an unsigned char cast to an int, or EOF on end of file or error.
getc() is equivalent to fgetc() except that it may be implemented as a macro which evaluates stream more than once.
getchar() is equivalent to getc(stdin).
gets() reads a line from stdin into the buffer pointed to by s until either a terminating newline or EOF, which it replaces with '