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Cray Standard C/C++ Reference Manual
which they are declared and referenced in Fortran. Arrays are zero-based in C
and C++ and are one-based in Fortran, so in C and C++ you should subtract 1
from the array subscripts that you would normally use in Fortran.
For example, using the Fortran declaration of array A in the preceding example,
the equivalent declaration in C or C++ is:
int a[2][3];
The following list shows how to access elements of the array from Fortran and
from C or C++:
F
ortran C or C++
A(1,1) A[0][0]
A(2,1) A[0][1]
A(3,1) A[0][2]
A(1,2) A[1][0]
A(2,2) A[1][1]
A(3,2) A[1][2]
9.3.4 Logical and Character Data
Logical and character data need special treatment for calls between C or C++ and
Fortran. Fortran has a character descriptor that is incompatible with a character
pointer in C and C++. The techniques used to represent logical (Boolean) values
also differ between Cray Standard C, C++, and Fortran.
Mechanisms you can use to convert one type to the other are provided by the
standard header file and conversion utilities shown in the following list:
H
eader file or
utility
Description
<fortran.h> Header file that defines the type _fcd, which
maps to the Fortran character descriptor and
defines or declares the macros or functions
contained in this list.
_cptofcd Conversion utility that converts a C or C++
character pointer to a Fortran character descriptor.
_fcdtocp Conversion utility that converts a Fortran
character descriptor to a C or C++ character
pointer.
128 S–2179–36
- Cray Standard C/C++ Reference 1
- New Features 3
- Record of Revision 5
- S–2179–36 v 9
- Directives [3] 45 11
- Cray Standard C++ [4] 103 13
- Predefined Macros [7] 117 14
- Contents 15
- S–2179–36 xi 15
- S–2179–36 xiii 17
- Related Publications 18
- Ordering Documentation 19
- Conventions 19
- Reader Comments 20
- Introduction [1] 21
- 2 S–2179–36 22
- Compiler Commands [2] 23
- 2.1 CC Command 24
- 2.2 cc Command 24
- S–2179–36 5 25
- 2.3 Command Line Options 26
- S–2179–36 7 27
- CC -O3 -h vector2 myfile.c 28
- 8 S–2179–36 28
- S–2179–36 9 29
- 10 S–2179–36 30
- 2.5 Template Language Options 32
- 2.6 Virtual Functions Options 33
- 2.7 General Language Options 34
- S–2179–36 15 35
- 16 S–2179–36 36
- S–2179–36 17 37
- 18 S–2179–36 38
- S–2179–36 19 39
- 20 S–2179–36 40
- S–2179–36 21 41
- 22 S–2179–36 42
- S–2179–36 23 43
- 24 S–2179–36 44
- S–2179–36 25 45
- 2.15 Math Options 46
- S–2179–36 27 47
- 2.16 Analysis Tool Options 48
- 2.17 Debugging Options 49
- 2.18 Compiler Message Options 50
- -h nomessage=174:9 51
- S–2179–36 31 51
- 32 S–2179–36 52
- S–2179–36 33 53
- 34 S–2179–36 54
- 2.20 Preprocessing Options 55
- 36 S–2179–36 56
- S–2179–36 37 57
- 2.21 Loader Options 58
- S–2179–36 39 59
- 2.22 Miscellaneous Options 60
- 2.23 Command Line Examples 62
- 2.24 Environment Variables 63
- 44 S–2179–36 64
- #pragma Directives [3] 65
- 3.1 Protecting Directives 66
- 3.3 Loop Directives 66
- 3.5 General Directives 68
- S–2179–36 55 75
- 3.6 Instantiation Directives 77
- 3.7 Vectorization Directives 77
- 3.8 Tasking Directives 82
- S–2179–36 63 83
- 64 S–2179–36 84
- __tsk_name_nnn 85
- S–2179–36 65 85
- 66 S–2179–36 86
- S–2179–36 67 87
- 70 S–2179–36 90
- 80 S–2179–36 100
- Directives [3] 101
- S–2179–36 81 101
- 82 S–2179–36 102
- S–2179–36 83 103
- S–2179–36 85 105
- 3.10 Scalar Directives 106
- S–2179–36 87 107
- 88 S–2179–36 108
- S–2179–36 89 109
- S–2179–36 91 111
- 92 S–2179–36 112
- S–2179–36 97 117
- 98 S–2179–36 118
- 3.11 Inlining Directives 120
- Cray Standard C++ [4] 123
- 104 S–2179–36 124
- 5.1 Complex Data Extensions 125
- 5.2 fortran Keyword 126
- S–2179–36 109 129
- 6.1 Automatic Instantiation 130
- S–2179–36 111 131
- 6.2 Instantiation Modes 133
- 114 S–2179–36 134
- 6.5 Implicit Inclusion 136
- Predefined Macros [7] 137
- 118 S–2179–36 138
- S–2179–36 119 139
- 8.1 Cray TotalView Debugger 141
- 122 S–2179–36 142
- S–2179–36 123 143
- 126 S–2179–36 146
- S–2179–36 127 147
- 128 S–2179–36 148
- S–2179–36 129 149
- Cray Standard C main program: 150
- 134 S–2179–36 154
- S–2179–36 135 155
- Cray Standard C++ program: 156
- S–2179–36 139 159
- S–2179–36 141 161
- 144 S–2179–36 164
- S–2179–36 145 165
- 146 S–2179–36 166
- S–2179–36 147 167
- 148 S–2179–36 168
- S–2179–36 149 169
- 150 S–2179–36 170
- 152 S–2179–36 172
- Libraries and Loaders [A] 173
- 154 S–2179–36 174
- S–2179–36 155 175
- B.1 C++ Conformance 177
- 158 S–2179–36 178
- S–2179–36 159 179
- 160 S–2179–36 180
- B.2 C++ Anachronisms Accepted 181
- 164 S–2179–36 184
- S–2179–36 171 191
- Compiler Messages [C] 193
- 174 S–2179–36 194
- C.3 Message Severity 195
- C.4 Common System Messages 196
- S–2179–36 177 197
- Intrinsic Functions [D] 199
- Cray SV1 series only 201
- S–2179–36 181 201
- S–2179–36 183 203
- 184 S–2179–36 204
- S–2179–36 185 205
- 186 S–2179–36 206
- S–2179–36 187 207
- 188 S–2179–36 208
- S–2179–36 189 209
- 190 S–2179–36 210
- S–2179–36 191 211
- 192 S–2179–36 212
- S–2179–36 193 213
- 194 S–2179–36 214
- S–2179–36 195 215
- 196 S–2179–36 216
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