output all a* by searching a text file

[Umesh]

/*program to search a* in a text file & write output in a file.*
indicated any character*/

#include<stdio. h>
#include<stdlib .h>
int main(void)
{
FILE *f,*fp;
f=fopen("c:/1.txt","r");
if(f==NULL) { puts("Error opening file");exit(0); }
fp=fopen("c:/2.txt","w");
char c[2];
for(int i=1;i<3;++i)
{
while((c[i]=getc(f))!=EOF)
if(c[1]=='a'&& c[2]!=' ')
fprintf(fp,"%c\ n",c[i]);
}
fclose(f);
fclose(fp);
return 0;
}
/*
INPUT c:/1.txt
abc
abc
abd
ap

OUTPUT c:/2.txt
a
a
a
a

REQUIRED OUTPUT c:/2.txt
ab
ab
ab
ap
*/

[osmium]

"Umesh" wrote:

<snippage>

Suppose I want to find all words in a text file which starts with 'a'
and ends with 'z' i.e a*z
where * denotes a string of characters. How can I do it?

CBFalconer wrote:
Umesh wrote:

/*WORKING BUT HOW TO GENERALISE IT FOR A LONG STRING
LIKE umesh*** ? */
#include<stdio. h>
#include<stdlib .h>
int main(void)

>To start with, I converted it to valid C90 code:

#include<stdio .h>
#include<stdli b.h>

int main(void) {
FILE *f, *fp;
char c, ch;

f = fopen("c:/1.txt", "r");
if (f == NULL) {
puts("Error opening file"); exit(0);
}
fp = fopen("c:/2.txt", "w");
while ((c = getc(f)) != EOF && (ch = getc(f)) != EOF) {
if(c == 'a' && ch != ' ')
fprintf(fp,"%c% c\n", c, ch);
}
fclose(f);
fclose(fp);
return 0;
}

I modified CBF's cleaned up version of your code so it wouldn't write on the
root of C: and ran the program. It didn't work for me. file 1 was

The qu)ick.bro:wn fox-jum"ped,ov~er;t helazy dog's:baxck.

and the ouput, file 2, was:
ax

What did I do wrong?

I suggest you look up two things, the *type* of the value returned by getc()
and "short circuited evaluation" (WRT boolean expressions).

Also, just before main() insert the following line:

/* This program computes the 13th term of the Malinkovsy formulation of the
Reiman hypothesis. */

If that is wrong in some way, correct it.

[Keith Thompson]

"osmium" <r1********@com cast.netwrites:
[...]

Also, just before main() insert the following line:

/* This program computes the 13th term of the Malinkovsy formulation of the
Reiman hypothesis. */

If that is wrong in some way, correct it.

Well, for starters you misspelled "Riemann", but I suspect that wasn't
your point. 8-)}

--
Keith Thompson (The_Other_Keit h) ks***@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <* <http://users.sdsc.edu/~kst>
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"