我尝试了许多不同的方式 - 似乎没有一种方法......
我想向上，向下，向左，向右传递指针 - 这样我就可以在被调用的函数中更改它们的值。 不知怎的，我无法弄清楚正确的语法。 我也找不到它 - 就像我在教科书和网上找到的建议一样，但是......没有运气。
//long find_neighbours( long, long *up, long *down, long *left, long *)
long find_neighbours( long, long, long, long, long);
int main (int argc, char *farg[])
{
...
neighbours = find_neighbours(i, &up, &down, &left, &right);
...
}
//long find_neighbours( long center_number, long *up, long *down, long *right)
long find_neighbours( long, long, long, long, long)
long center_number, *up, *down, *left, *right;
{
long x, y, neighbours;
y = (long)(center_number/Lmax);
x = center_number - (y*Lmax);
if( !( x % center_number) ) //lqwa stena
{
*left = center_number + Lmax;
*right = center_number+1;
}
else
{
if( !((x+1)%center_number) ) //dqsna stena
{
*left = center_number-1;
*right = center_number-Lmax;
}
else
{
*left = center_number - 1;
*right = center_number + 1;
}
}
if( y == 0 ) //lqwa stena
{
*up = 1 + x;
*down = Lmax1 + x;
}
else
{
if( y == Lmax1 ) //dqsna stena
{
*up = x;
*down = Lmax - 2 +x;
}
else
{
*down = center_number - Lmax;
*up = center_number + Lmax;
}
}
neighbours = Numb[*left] + Numb[*right] + Numb[*up] + Numb[*down];
return (neighbours);
}
>>>$ gcc -lm perco_concCyclingv2.c -o square_clusters
>>>perco_concCyclingv2.c: In function ‘main’:
>>>perco_concCyclingv2.c:183:20: warning: passing argument 2 of ‘find_neighbours’ makes >>>integer from pointer without a cast [enabled by default]
>>> neighbours = find_neighbours(i, &up, &down, &left, &right);
>>> ^
>>>perco_concCyclingv2.c:20:6: note: expected ‘long int’ but argument is of type ‘long int >>>**’
>>> long find_neighbours( long, long, long, long, long);
>>> ^
>>>perco_concCyclingv2.c:183:20: warning: passing argument 3 of ‘find_neighbours’ makes >>>integer from pointer without a cast [enabled by default]
>>> neighbours = find_neighbours(i, &up, &down, &left, &right);
>>> ^
>>>perco_concCyclingv2.c:20:6: note: expected ‘long int’ but argument is of type ‘long int >>>**’
>>> long find_neighbours( long, long, long, long, long);
>>> ^
>>>perco_concCyclingv2.c:183:20: warning: passing argument 4 of ‘find_neighbours’ makes >>>integer from pointer without a cast [enabled by default]
>>> neighbours = find_neighbours(i, &up, &down, &left, &right);
>>> ^
>>>perco_concCyclingv2.c:20:6: note: expected ‘long int’ but argument is of type ‘long int >>>**’
>>> long find_neighbours( long, long, long, long, long);
>>> ^
>>>perco_concCyclingv2.c:183:20: warning: passing argument 5 of ‘find_neighbours’ makes >>>integer from pointer without a cast [enabled by default]
>>> neighbours = find_neighbours(i, &up, &down, &left, &right);
>>> ^
>>>perco_concCyclingv2.c:20:6: note: expected ‘long int’ but argument is of type ‘long int >>>**’
>>> long find_neighbours( long, long, long, long, long);
>>> ^
>>>perco_concCyclingv2.c:235:21: warning: passing argument 2 of ‘find_neighbours’ makes >>>integer from pointer without a cast [enabled by default]
>>> neighbours = find_neighbours(i, &up, &down, &left, &right);
>>> ^
>>>perco_concCyclingv2.c:20:6: note: expected ‘long int’ but argument is of type ‘long int >>>**’
>>> long find_neighbours( long, long, long, long, long);
>>> ^
>>>perco_concCyclingv2.c:235:21: warning: passing argument 3 of ‘find_neighbours’ makes >>>integer from pointer without a cast [enabled by default]
>>> neighbours = find_neighbours(i, &up, &down, &left, &right);
>>> ^
>>>perco_concCyclingv2.c:20:6: note: expected ‘long int’ but argument is of type ‘long int >>>**’
>>>long find_neighbours( long, long, long, long, long);
>>> ^
>>>perco_concCyclingv2.c:235:21: warning: passing argument 4 of ‘find_neighbours’ makes >>>integer from pointer without a cast [enabled by default]
>>> neighbours = find_neighbours(i, &up, &down, &left, &right);
>>> ^
>>>perco_concCyclingv2.c:20:6: note: expected ‘long int’ but argument is of type ‘long int >>>**’
>>> long find_neighbours( long, long, long, long, long);
>>> ^
>>>perco_concCyclingv2.c:235:21: warning: passing argument 5 of ‘find_neighbours’ makes >>>integer from pointer without a cast [enabled by default]
>>> neighbours = find_neighbours(i, &up, &down, &left, &right);
>>> ^
>>>perco_concCyclingv2.c:20:6: note: expected ‘long int’ but argument is of type ‘long int >>>**’
>>> long find_neighbours( long, long, long, long, long);
>>> ^
>>>perco_concCyclingv2.c: In function ‘find_neighbours’:
>>>perco_concCyclingv2.c:278:6: error: old-style parameter declarations in prototyped >>>function definition
>>> long find_neighbours( long, long, long, long, long)
>>> ^
>>>perco_concCyclingv2.c:278:1: error: parameter name omitted
>>>long find_neighbours( long, long, long, long, long)
>>> ^
>>>perco_concCyclingv2.c:278:1: error: parameter name omitted
>>>perco_concCyclingv2.c:278:1: error: parameter name omitted
>>>perco_concCyclingv2.c:278:1: error: parameter name omitted
>>>perco_concCyclingv2.c:278:1: error: parameter name omitted
>>>perco_concCyclingv2.c:283:13: error: ‘center_number’ undeclared (first use in this >>>function)
>>> y = (long)(center_number/Lmax);
>>> ^
>>>perco_concCyclingv2.c:283:13: note: each undeclared identifier is reported only once >>>for each function it appears in
>>>perco_concCyclingv2.c:288:7: error: ‘left’ undeclared (first use in this function)
>>> *left = center_number + Lmax;
>>> ^
>>>perco_concCyclingv2.c:289:7: error: ‘right’ undeclared (first use in this function)
>>> *right = center_number+1;
>>> ^
>>>perco_concCyclingv2.c:307:7: error: ‘up’ undeclared (first use in this function)
>>> *up = 1 + x;
>>> ^
>>>perco_concCyclingv2.c:308:7: error: ‘down’ undeclared (first use in this function)
>>> *down = Lmax1 + x;
>>>
请帮助......任何形式？ 谢谢......
答案 0 :(得分：1)
每当您需要一个函数来修改其参数时，请记住以下几点：
以下是要演示的代码段。它定义了一个将其参数设置为100的函数。然后，它在一个值为0的变量上调用此函数，并在调用后打印该变量的值，以表明它确实已被修改。
int f(int* x) {
*x = 100;
}
int main(void) {
int q = 0;
f(&q);
printf("%d\n", q);
return 0;
}
我希望这会有所帮助。
答案 1 :(得分：0)
谢谢 - 我在阅读之后发现了我做错了什么......所有的一切，我都没有读过 - 所有的时间 - 唯一的错误 - 并没有看到我宣布的方式首先是变量。 ＆＃34;因为它如此简单＆＃34;。
in＆＃34; main＆＃34;：
long *x, *y, left, right, up, down, xp, yp; // the right way
long *x, *y, *left, *right, *up, *down, *xp, *yp; // the way it was left...
我对错误和警告感到困惑 - 并且从未回到申报行。
抱歉，我很抱歉。 谢谢，大家。