I tried to run this c program in borland c++. It shows "expression required", while declaring the array int holes[size]
. This is the only error that is shown. I tried to solve it but it still shows the same problem.
How can I solve this problem?
/*
* C Program to Implement Pigeonhole Sort
*/
#include <stdio.h>
#define MAX 7
void pigeonhole_sort(int, int, int *);
void main()
{
int a[MAX], i, min, max;
printf("enter the values into the matrix :");
for (i = 0; i < MAX; i++)
{
scanf("%d", &a[i]);
}
min = a[0];
max = a[0];
for (i = 1; i < MAX; i++)
{
if (a[i] < min)
{
min = a[i];
}
if (a[i] > max)
{
max = a[i];
}
}
pigeonhole_sort(min, max, a);
printf("Sorted order is :\n");
for (i = 0; i < MAX; i++)
{
printf("%d", a[i]);
}
}
/* sorts the array using pigeonhole algorithm */
void pigeonhole_sort(int mi, int ma, int * a)
{
int size, count = 0, i;
int *current;
current = a;
size = ma - mi + 1;
int holes[size];
for (i = 0; i < size; i++)
{
holes[i] = 0;
}
for (i = 0; i < size; i++, current++)
{
holes[*current-mi] += 1;
}
for (count = 0, current = &a[0]; count < size; count++)
{
while (holes[count]--> 0)
{
*current++ = count + mi;
}
}
}
int holes[size]
is a variable-length array (VLA), a feature that has "only" been around in C for 17 years and is not supported by C++.
So it would seem that you either have a completely outdated compiler (Borland has not released any compilers for the past 10 years) or you are trying to compile C code with a C++ compiler. Neither will work.
If by "Borland" you happen to mean Embarcadero C++ Builder, then you merely have to tell it to compile the code as C instead of C++.
Otherwise, you will have to upgrade to a modern C compiler, like for example GCC/Mingw. For example by downloading the completely free Windows version of the Codeblocks IDE, which comes with that compiler pre-installed.
在函数Pigeonhole_sort的第三个参数中,您声明一个指针,并在调用语句中传递一个数组
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.