output in reverse order

[Wan Andii]

Hello Group,

I have a program that reads integers from an external data file. I'm
trying to figure out how to get the result in
reverse order. For eg., if file contains 1,2,3,4 then I'd like to get
the output 4,3,2,1. Thanks in advance.
Wan

int main()

{

FILE *f;
int c[20];

f=fopen("C:\File.text","r");

if (!f)
return 1;

while (f!=NULL)
{
printf("%s",c);
}


fclose(f);
return 0;

}

[Alex Blekhman]

Post by Wan Andii
I have a program that reads integers from an external data file.
I'm trying to figure out how to get the result in reverse order.
For eg., if file contains 1,2,3,4 then I'd like to get the
output 4,3,2,1.
int main()
{
FILE *f;
int c[20];
f=fopen("C:\File.text","r");
if (!f)
return 1;

size_t count = <length of file> / sizeof(int);

while(count--)
printf("%d",c[count]);


Is that what you need?

Alex

[Barry Schwarz]

On Tue, 17 Nov 2009 09:52:11 +0200, "Alex Blekhman"

Post by Alex Blekhman

Post by Wan Andii
I have a program that reads integers from an external data file.
I'm trying to figure out how to get the result in reverse order.
For eg., if file contains 1,2,3,4 then I'd like to get the
output 4,3,2,1.
int main()
{
FILE *f;
int c[20];
f=fopen("C:\File.text","r");
if (!f)
return 1;

size_t count = <length of file> / sizeof(int);

Does sizeof(int) have anything to do with their text representation in
the file? For the given sample on a 32 bit system, this evaluates to
1 which seems to be short by 3.

Post by Alex Blekhman
while(count--)
printf("%d",c[count]);
Is that what you need?
Alex

[Alex Blekhman]

Post by Barry Schwarz
Does sizeof(int) have anything to do with their text
representation in the file? For the given sample on a 32 bit
system, this evaluates to 1 which seems to be short by 3.

Good catch. I was thinking about binary files with integers for
some reason.

Alex

[Igor Tandetnik]

Post by Wan Andii
I have a program that reads integers from an external data file.

Are you sure you have one? The code you show below is not it.

Post by Wan Andii
I'm trying to figure out how to get the result in
reverse order. For eg., if file contains 1,2,3,4 then I'd like to get
the output 4,3,2,1.

Sounds like homework to me. On the off chance it's not, what practical problem are you trying to solve?

Post by Wan Andii
int main()
{
FILE *f;
int c[20];
f=fopen("C:\File.text","r");

Make it "C:\\File.text". Backslashes need to be escaped.

Post by Wan Andii
if (!f)
return 1;
while (f!=NULL)
{

Since the body of the loop doesn't change the value of the variable 'f', the condition will never become false. You have an infinite loop.

Post by Wan Andii
printf("%s",c);

%s specifier expects a char* parameter, not an int*. Besides, 'c' was never initialized and contains random garbage.