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Description

The C library function char *fgets(char *str, int n, FILE *stream) reads a line from the specified stream and stores it into the string pointed to by str. It stops when either (n-1) characters are read, the newline character is read, or the end-of-file is reached, whichever comes first.

Declaration

Following is the declaration for fgets() function.

char *fgets(char *str, int n, FILE *stream)

Parameters

• str − This is the pointer to an array of chars where the string read is stored.

• n − This is the maximum number of characters to be read (including the final null-character). Usually, the length of the array passed as str is used.

• stream − This is the pointer to a FILE object that identifies the stream where characters are read from.

Return Value

On success, the function returns the same str parameter. If the End-of-File is encountered and no characters have been read, the contents of str remain unchanged and a null pointer is returned.

If an error occurs, a null pointer is returned.

Example

The following example shows the usage of fgets() function.

#include 

int main () {
   FILE *fp;
   char str[60];

   /* opening file for reading */
   fp = fopen("file.txt" , "r");
   if(fp == NULL) {
      perror("Error opening file");
      return(-1);
   }
   if( fgets (str, 60, fp)!=NULL ) {
      /* writing content to stdout */
      puts(str);
   }
   fclose(fp);

   return(0);
}

Let us assume, we have a text file file.txt, which has the following content. This file will be used as an input for our example program −

We are in 2012

Now, let us compile and run the above program that will produce the following result −

We are in 2012