C feof() function
C library function - feof()
The feof() function indicates whether the end-of-file flag is set for the given stream.
Syntax:
int feof(FILE *stream)
feof() Parameters:
Name | Description | Required /Optional |
---|---|---|
stream | Identifies an address for a file descriptor, which is an area of memory associated with an input or output stream. | Required |
Return value from feof()
- The feof() function shall return non-zero if and only if the end-of-file indicator is set for stream.
Example: feof() function
This example read a text file until it reads an end-of-file character.
#include <stdio.h>
int main () {
FILE *fp;
int c;
fp = fopen("file.txt","r");
if(fp == NULL) {
perror("Error in opening file");
return(-1);
}
while(1) {
c = fgetc(fp);
if( feof(fp) ) {
break ;
}
printf("%c", c);
}
fclose(fp);
return(0);
}
Output:
c Programming1 c Programming2 c Programming3
C Programming Code Editor:
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C Programming: Tips of the Day
Reading a string with scanf :
An array "decays" into a pointer to its first element, so scanf("%s", string) is equivalent to scanf("%s", &string[0]). On the other hand, scanf("%s", &string) passes a pointer-to-char[256], but it points to the same place.
Then scanf, when processing the tail of its argument list, will try to pull out a char *. That's the Right Thing when you've passed in string or &string[0], but when you've passed in &string you're depending on something that the language standard doesn't guarantee, namely that the pointers &string and &string[0] -- pointers to objects of different types and sizes that start at the same place -- are represented the same way.
Ref : https://bit.ly/3pdEk6f
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