G77_INTRINSICS
Examples of G77 Intrinsic Functions

G77_INTRINSICS contains examples demonstrating the use and features of some of the intrinsic routines peculiar to the G77 FORTRAN compiler.

These functions are not listed in the FORTRAN standard; they are in some cases commonly available in C or C++ compilers.

Note that the G77 compiler is no longer being developed by Gnu. Instead, the GFORTRAN compiler has been produced, which can handle all the various dialects of FORTRAN. Users of G77 should consider using GFORTRAN instead.

Related Data and Programs:

C is a directory which includes some examples on features of the C language.

CPP is a directory which includes some examples on features of the C++ language.

F77 is a directory which includes some examples on features of the FORTRAN77 language.

F77_INTRINSICS is a directory which includes some examples of the use of intrinsic functions included with the FORTRAN77 standard language.

F90 is a directory which includes some examples on features of the FORTRAN90 language.

F90_INTRINSICS is a directory which includes some examples of the use of intrinsic functions defined as part of the FORTRAN90 standard.

G++_INTRINSICS is a C++ program which demonstrates some of the intrinsic functions provided by the G++ compiler.

G95_INTRINSICS is a directory which includes some examples of the use of "extra" intrinsic functions defined as part of the G95 compiler.

GCC_INTRINSICS is a C program which demonstrates some of the intrinsic functions provided by the GCC compiler.

GFORTRAN_INTRINSICS is a FORTRAN77 program which demonstrates the use of some of the intrinsic functions included with the GFORTRAN compiler.

MIXED shows some examples of writing a program partly in FORTRAN77 and partly in some other language.

MPI shows how to set up parallel programs in FORTRAN77.

TEST_VALUES is a FORTRAN77 library which stores some sample values of various special functions.

TIMER shows how to compute elapsed CPU time in FORTRAN77.

TIMESTAMP is a FORTRAN77 library which shows how to get a timestamp in FORTRAN77.

XLF_INTRINSICS is a directory which includes some examples of the use of intrinsic functions peculiar to the IBM XLF FORTRAN compiler.

Reference:

1. The Gnu FORTRAN page, http://www.gnu.org/software/fortran/fortran.html .

Examples and Tests:

• g77_intrinsics_prb.f, a single program that calls many tests; eact test is devoted to a particular G77 intrinsic function.
• g77_intrinsics_prb.csh, commands that compile and run the test;
• g77_intrinsics_prb_output.txt, the output file;

List of Routines:

• MAIN is the main program for G77_INTRINSICS_PRB.
• TEST_BESJ0 checks BESJ0 against BESSEL_J0_VALUES.
• TEST_BESJ1 checks BESJ1 against BESSEL_J1_VALUES.
• TEST_BESJN checks BESJN against BESSEL_JN_VALUES.
• TEST_BESY0 checks BESY0 against BESSEL_Y0_VALUES.
• TEST_BESY1 checks BESY1 against BESSEL_Y1_VALUES.
• TEST_BESYN checks BESYN against BESSEL_YN_VALUES.
• TEST_DBESJ0 checks DBESJ0 against BESSEL_J0_VALUES.
• TEST_DBESJ1 checks DBESJ1 against BESSEL_J1_VALUES.
• TEST_DBESJN checks DBESJN against BESSEL_JN_VALUES.
• TEST_DBESY0 checks DBESY0 against BESSEL_Y0_VALUES.
• TEST_DBESY1 checks DBESY1 against BESSEL_Y1_VALUES.
• TEST_DBESYN checks DBESYN against BESSEL_YN_VALUES.
• TEST_DERF checks DERF against ERF_VALUES.
• TEST_DERFC checks DERFC against ERFC_VALUES.
• TEST_ERF checks ERF against ERF_VALUES.
• TEST_ERFC checks ERFC against ERFC_VALUES.
• TEST_RAND tests RAND.
• BESSEL_J0_VALUES returns some values of the J0 Bessel function.
• BESSEL_J1_VALUES returns some values of the J1 Bessel function.
• BESSEL_JN_VALUES returns some values of the Jn Bessel function.
• BESSEL_Y0_VALUES returns some values of the Y0 Bessel function.
• BESSEL_Y1_VALUES returns some values of the Y1 Bessel function.
• BESSEL_YN_VALUES returns some values of the Yn Bessel function.
• ERF_VALUES returns some values of the ERF or "error" function for testing.
• ERFC_VALUES returns some values of the ERFC or "complementary error" function for testing.
• TIMESTAMP prints out the current YMDHMS date as a timestamp.

You can go up one level to the FORTRAN77 source codes.