Reads data from the current position of stream into the locations given by argument.
int fscanf( FILE * stream, const char * format, ... )
- Pointer to FILE structure
- Format-control string
Returns the number of fields successfully converted and assigned; the return value does not include fields that were read but not assigned. A return value of 0 indicates that no fields were assigned. If an error occurs, or if the end of the file stream is reached before the first conversion, the return value is EOF.
//The following example writes formatted data to a file. It then uses fscanf to read the various data back from the file.
stream = fopen( "fscanf.out", "w+" );
if( stream == NULL )
printf( "The file fscanf.out was not opened\n" );
fprintf( stream, "%s %ld %f%c", "a-string",
65000, 3.14159, 'x' );
// Set pointer to beginning of file:
fseek( stream, 0L, SEEK_SET );
// Read data back from file:
fscanf( stream, "%s", s );
fscanf( stream, "%ld", &l );
fscanf( stream, "%f", &fp );
fscanf( stream, "%c", &c );
// Output data read:
printf( "%s\n", s );
printf( "%ld\n", l );
printf( "%f\n", fp );
printf( "%c\n", c );
fclose( stream );
Reads data from the current position of stream into the locations given by argument (if any). Each argument must be a pointer to a variable of a type that corresponds to a type specifier in format. format controls the interpretation of the input fields and has the same form and function as the format argument for printf. If copying takes place between strings that overlap, the behavior is undefined.
Header to Include