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Fortran Library Reference

putc, fputc: Write a Character to a Logical Unit

putc writes to logical unit 6, normally the control terminal output.

fputc writes to a logical unit.

These functions write a character to the file associated with a FORTRAN logical unit bypassing normal FORTRAN I/O.

Do not mix normal FORTRAN output with output by these functions on the same unit.

putc: Write to Logical Unit 6

The function is called by:

INTEGER*4 putc

status = putc( char )

char

character

Input 

The character to write to the unit  

Return value 

INTEGER*4

Output  

status=0: OK

status>0: System error code

Example: putc(): 

    character char, s*10 / 'OK by putc' /
    INTEGER*4 putc, status
    do i = 1, 10
        char = s(i:i)
        status = putc( char )
    end do
    status = putc( '\n' )
    end
demo% f77 -silent tputc.f 
demo% a.out 
OK by putc 
demo%

fputc: Write to Specified Logical Unit

The function is called by:

INTEGER*4 fputc

status = fputc( lunit,char )

lunit

INTEGER*4

Input 

The unit to write to  

char

character

Input 

The character to write to the unit  

Return value 

INTEGER*4

Output  

status=0: OK

status>0: System error code

Example: fputc(): 

    character char, s*11 / 'OK by fputc' /
    INTEGER*4 fputc, status
    open( 1, file='tfputc.data')
    do i = 1, 11
        char = s(i:i)
        status = fputc( 1, char )
    end do
    status = fputc( 1, '\n' )
    end
demo% f77 -silent tfputc.f 
demo% a.out 
demo% cat tfputc.data 
OK by fputc 
demo%

See also putc(3S), intro(2), and perror(3F).