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Standard C Libraries
fopen (Continued)
if ((myfile1 = fopen("afile1", "r")) == NULL)
printf("Cannot open afile1\n");
else
{
printf("afile1 was opened\n");
y = fclose(myfile1);
if (y == EOF)
printf("afile1 was not closed\n");
else
printf("afile1 was closed\n");
}
if ((myfile1 = fopen("afile1", "w+")) == NULL)
printf("Second try, cannot open afile1\n");
else
{
printf("Second try, afile1 was opened\n");
y = fclose(myfile1);
if (y == EOF)
printf("afile1 was not closed\n");
else
printf("afile1 was closed\n");
}
if ((myfile2 = fopen("afile2", "w+")) == NULL)
printf("Cannot open afile2\n");
else
{
printf("afile2 was opened\n");
y = fclose(myfile2);
if (y == EOF)
printf("afile2 was not closed\n");
else
printf("afile2 was closed\n");
}
}
Output:
Cannot
Second
afile1
afile2
afile2
open afile1
try, afile1 was opened
was closed
was opened
was closed
Explanation:
afile1 must exist before it can be opened for reading ( r ) or the
fopen function will fail. If the fopen function opens a file for writing
( w+ ) it does not have to already exist. If it doesn't exist, it will be created
and then opened.
? 2008 Microchip Technology Inc.
DS51456E-page 57
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