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tconst2.c
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tconst2.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static int
myfun(int lines,
const int array[][6])
{
int sum = 0;
int i, j;
#if 0
array[0][0] = 1; /* read-only */
memset(array, '\0', lines * 6 * sizeof(array[0][0]));
#endif
for (i = 0; i < lines; i++)
for (j = 0; j < 6; j++)
sum += array[i][j];
return sum;
}
static int
myfun2(int lines,
const int (*ap)[6])
{
int sum = 0;
int i, j;
#if 0
ap[0][0] = 1; /* read-only */
memset(ap, '\0', lines * 6 * sizeof(ap[0][0]));
#endif
for (i = 0; i < lines; i++)
for (j = 0; j < 6; j++)
sum += ap[i][j];
return sum;
}
static int
simplefun(const int array[6])
{
int sum = 0;
int i;
#if 0
array[0][0] = 1; /* read-only */
memset(array, '\0', lines * 6 * sizeof(array[0][0]));
#endif
for (i = 0; i < 6; i++)
sum += array[i];
return sum;
}
static int
simplefun2(const int ap[])
{
int sum = 0;
int i;
#if 0
ap[0][0] = 1; /* read-only */
memset(ap, '\0', lines * 6 * sizeof(ap[0][0]));
#endif
for (i = 0; i < 6; i++)
sum += ap[i];
return sum;
}
static int
callmyfun_bad(void)
{
int myarray[3][6] = {
{1,2,3,4,5,6},
{7,8,9,10,11,12},
{13,14,15,16,17,18}};
return myfun(sizeof(myarray)/sizeof(*myarray), myarray); /* incompatible pointer type */
}
static int
callmyfun_good(void)
{
int myarray[3][6] = {
{1,2,3,4,5,6},
{7,8,9,10,11,12},
{13,14,15,16,17,18}};
return myfun(sizeof(myarray)/sizeof(*myarray), (const int(*)[6]) myarray);
}
static int
callmyfun_good2(void)
{
int myarray[3][6] = {
{1,2,3,4,5,6},
{7,8,9,10,11,12},
{13,14,15,16,17,18}};
return myfun2(sizeof(myarray)/sizeof(*myarray), (const int(*)[6]) myarray);
}
static int
callsimplefun(void)
{
int myarray[6] = {1,2,3,4,5,6};
return simplefun(myarray);
}
static int
callsimplefun2(void)
{
int myarray[6] = {1,2,3,4,5,6};
return simplefun2(myarray);
}
int main(void);
int
main()
{
printf("bad = %d\n", callmyfun_bad());
printf("good = %d\n", callmyfun_good());
printf("good2 = %d\n", callmyfun_good2());
printf("simple = %d\n", callsimplefun());
printf("simple2 = %d\n", callsimplefun2());
exit(0);
}
/*
* Local Variables:
* eval: (make-local-variable 'compile-command)
* compile-command: (let ((fn (file-name-sans-extension (file-name-nondirectory (buffer-file-name))))) (concat "rm -f " fn "; " (default-value 'compile-command) " " fn " && ./" fn))
* End:
*/