fopen returns a pointer and your seeing if it == -1... if (fp==NULL), maybe.
depending on what lib your using. see what the return type is.
Thanks,
~~TheCreator~~
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----- Original Message -----
From: Bill Cunningham
To: [email protected]
Sent: Friday, August 08, 2008 2:37 PM
Subject: [c-prog] warning
I get a comparsion between pointer and integer (I believe) errror for
this code. It is the line after the fclose function. Can anyone help me
understand what's going on. Disregard the ex macro. Since this is going to
be used by no one but me I thought I'd save a few keystrokes.
#include <stdio.h>
#include <stdlib.h>
#define ex exit(EXIT_FAILURE)
int main(int argc,char *argv[]) {
if (argc >4) {
puts("print usage error");
ex;
}
FILE *fp;
double x,y;
x=strtod(argv[1],NULL);
y=strtod(argv[2],NULL);
if ((fp=fopen(argv[3],"a"))==NULL) {
puts("open error");
ex;
}
fprintf(fp,"%.2f\t%.2f",x,y);
fclose(fp);
if(fp==-1) {
puts("close error");
ex;
}
return 0;
}
Bill
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