Last change
on this file since 4002956 was
df699e0,
checked in by Peter A. Buhr <pabuhr@…>, 3 months ago
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program updates to match text
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-
Property mode set to
100644
|
File size:
1.4 KB
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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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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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19 | |
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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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23 | |
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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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27 | |
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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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31 | |
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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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34 | |
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35 | assert( (void *) pa == (void *) pa0 ); |
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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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43 | ar[2][3]; |
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44 | b[2][3]; |
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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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50 | |
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51 | // Local Variables: // |
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52 | // compile-command: "sed -f sedcmd bkgd-carray-mdim.c | gcc-11 -Wall -Wextra -x c -" // |
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53 | // End: // |
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