Last change
on this file since 562ccf9 was
df699e0,
checked in by Peter A. Buhr <pabuhr@…>, 3 months ago
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program updates to match text
|
-
Property mode set to
100644
|
File size:
1.4 KB
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Rev | Line | |
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[7972603] | 1 | #include <stdio.h> |
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| 2 | #include <assert.h> |
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| 3 | #include <stdlib.h> |
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| 4 | |
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| 5 | #define SHOW(x, fmt) printf( #x ": " fmt "\n", x ) |
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| 6 | |
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| 7 | #ifdef ERRS |
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| 8 | #define ERR(...) __VA_ARGS__ |
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| 9 | #else |
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| 10 | #define ERR(...) |
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| 11 | #endif |
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| 12 | |
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| 13 | |
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| 14 | |
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| 15 | int main() { |
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[df699e0] | 16 | float ar[3][10]; |
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| 17 | static_assert(sizeof(float) == 4); $\C{// floats (atomic elements) are 4 bytes}$ |
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| 18 | static_assert(sizeof(void*) == 8); $\C{// pointers are 8 bytes}$ |
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[5546f50b] | 19 | |
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[df699e0] | 20 | static_assert(sizeof(ar) == 120); $\C{// the array, float[3][10]}$ |
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| 21 | static_assert(sizeof(ar[0]) == 40); $\C{// its first element, float[10]}$ |
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| 22 | static_assert(sizeof(ar[0][0]) == 4); $\C{// its first grand element, float}$ |
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[5546f50b] | 23 | |
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[df699e0] | 24 | static_assert(sizeof(&(ar)) == 8); $\C{// pointer to the array, float(*)[3][10]}$ |
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| 25 | static_assert(sizeof(&(ar[0])) == 8); $\C{// pointer to its first element, float(*)[10]}$ |
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| 26 | static_assert(sizeof(&(ar[0][0])) == 8); $\C{// pointer to its first grand-element, float*}$ |
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[5546f50b] | 27 | |
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[df699e0] | 28 | float (*pa)[3][10] = &(ar); |
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| 29 | float (*pa0)[10] = &(ar[0]); |
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| 30 | float *pa00 = &(ar[0][0]); |
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[5546f50b] | 31 | |
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[df699e0] | 32 | static_assert((void*)&ar == (void*)&(ar[0] )); |
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| 33 | static_assert((void*)&ar == (void*)&(ar[0][0])); |
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[5546f50b] | 34 | |
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[df699e0] | 35 | assert( (void *) pa == (void *) pa0 ); |
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[5546f50b] | 36 | assert( (void *) pa == (void *) pa00 ); |
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| 37 | |
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| 38 | // float (*b[3])[10]; |
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| 39 | float *b[3]; |
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| 40 | for (int i = 0; i < 3; i ++) { |
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| 41 | b[i] = malloc(sizeof(float[10])); |
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| 42 | } |
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[df699e0] | 43 | ar[2][3]; |
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[5546f50b] | 44 | b[2][3]; |
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[7972603] | 45 | /* |
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| 46 | |
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| 47 | */ |
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| 48 | |
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| 49 | } |
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[a885357] | 50 | |
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| 51 | // Local Variables: // |
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[df699e0] | 52 | // compile-command: "sed -f sedcmd bkgd-carray-mdim.c | gcc-11 -Wall -Wextra -x c -" // |
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[a885357] | 53 | // End: // |
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