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| Code Block |
|---|
void addscalar(int n, int m, double a[n][n*m+300], double x);
int main(void)
{
double b[4][308];
addscalar(4, 2, b, 2.17);
return 0;
}
void addscalar(int n, int m, double a[n][n*m+300], double x)
{
for (int i = 0; i < n; i++)
for (int j = 0, k = n*m+300; j < k; j++)
/* a is a pointer to a VLA with n*m+300 elements */
a[i][j] += x;
}
|
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API05-C-EX0: The extended array syntax is not supported by C++, or platforms that do not support C99, such as MSVC. Consequently, C programs that must support such platforms, including Windows, need not use conformant array parameters. One option for portable code that must support MSVC such platforms is to use macros:
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|---|---|---|---|---|
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#include <stddef.h> #if !defined(__STDC_VERSION__) || (_MSC_VER) __STDC_VERSION__ < 199901L || defined(__STDC_NO_VLA__) #define N(x) #else #define N(x) (x) #endif int f(size_t n, int a[N(n)]); |
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