指向结构指针的指针。 [英] Pointer to pointers of structs.
问题描述
您好我希望我的主题正确..
这就是我正在做的事情：
创建P（变量）多边形每个都有可变数量的顶点，我的mallocs中的东西是错误的...因为我得到了奇怪的结果。
帮助？
#include< stdio.h>
#include< stdlib.h>
typedef struct point
{
双x，y;
}点;
typedef struct polygon
$
int n;
point * v;
} polygon;
typedef struct line
{
point p1，p2;
double A，B;
} line;
#define P 2
int main（）
{
int i = 0，j = 0;
多边形*障碍= malloc（sizeof *障碍* P）;
for（i = 0; i < P; i ++）
{
障碍[i] .n = i + P * 2;
障碍[i] .v = malloc（sizeof障碍[i] .v *障碍[i] .n）;
for（j = 0; j<障碍[I] .N; i ++）
{
障碍[i] .v [j] .x =障碍[i] .n;
障碍[i] .v [j] .y =障碍[i] .n + 5;
}
}
}
Hi I hope I got the topic right..
that''s what I''m doing:
create P(variable) polygons each having a variable numbers of vertices,
something in my mallocs is wrong... since I get weird results.
help?
#include <stdio.h>
#include <stdlib.h>
typedef struct point
{
double x, y;
} point;
typedef struct polygon
{
int n;
point *v;
} polygon;
typedef struct line
{
point p1, p2;
double A, B;
} line;
#define P 2
int main()
{
int i = 0, j = 0;
polygon *obstacles = malloc(sizeof *obstacles * P);
for(i = 0; i < P; i++)
{
obstacles[i].n = i + P * 2;
obstacles[i].v = malloc(sizeof obstacles[i].v * obstacles[i].n);
for(j = 0; j < obstacles[i].n; i++)
{
obstacles[i].v[j].x = obstacles[i].n;
obstacles[i].v[j].y = obstacles[i].n + 5;
}
}
}
推荐答案
jo ******** @ gmail.com 写道：
jo********@gmail.com wrote:
创建P（变量）多边形，每个多边形都有可变数量的顶点，我的mallocs中的某些内容是错误的...我得到了奇怪的结果。
create P(variable) polygons each having a variable numbers of vertices,
something in my mallocs is wrong... since I get weird results.
请更具体一点：奇怪的结果是什么意思？
-
：wq
^ X ^ Cy ^ K ^ X ^ C ^ C ^ C ^ C
Please be more specific: what do you mean by ''weird results'' ?
--
:wq
^X^Cy^K^X^C^C^C^C
>请更具体一点：奇怪的结果是什么意思？
为了更清楚，该程序还没有完成运行。我非常好
肯定我已经在mem-allocation中搞了一个混乱......
谢谢。
>Please be more specific: what do you mean by ''weird results'' ?
To make it clearer, the program doesn''t finish runing. I''m quite
certain I''ve made a copmlete mess out of the mem-allocation...
Thanks.
jo ******** @ gmail.com 写道：
嗨我希望我的主题正确..
这就是我正在做的事情：
创建P（变量） ）每个都有可变数量的顶点的多边形，在我的mallocs中的某些东西是错误的...因为我得到了奇怪的结果。
帮助？
[...]
int main（）
{i / 0，j = 0;
多边形*障碍= malloc（sizeof *障碍* P）;
for（i = 0; i< P; i ++）
{
障碍[i] .n = i + P * 2;
障碍[i] .v = malloc（sizeof障碍[i] .v *障碍[i] .n）;
（j = 0; j<障碍[i] .n; i ++）
^^
可能你的意思是上面的循环中的j ++。
{
障碍[i]。 v [j] .x =障碍[i] .n;
障碍[i] .v [j] .y =障碍[i] .n + 5;
}
}
}
Hi I hope I got the topic right..
that''s what I''m doing:
create P(variable) polygons each having a variable numbers of vertices,
something in my mallocs is wrong... since I get weird results.
help? [...]
int main()
{
int i = 0, j = 0;
polygon *obstacles = malloc(sizeof *obstacles * P);
for(i = 0; i < P; i++)
{
obstacles[i].n = i + P * 2;
obstacles[i].v = malloc(sizeof obstacles[i].v * obstacles[i].n);
for(j = 0; j < obstacles[i].n; i++) ^^
Likely you mean j++ in the above for loop.
{
obstacles[i].v[j].x = obstacles[i].n;
obstacles[i].v[j].y = obstacles[i].n + 5;
}
}
}
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