Question

C语言动态分配内存给结构体数组

这个程序有问题啊 大兵给解释解释
#include<stdio.h>
#include<stdlib.h>
struct person
{int number;
int nextp;
};
main()
{
int i,n;
scanf("%d",&n);
struct person *p=NULL;
p=(struct person*)malloc(sizeof(struct person)*n);
for(i=0;i<n;i++)
{
p[i].nextp=i
p[i].number=i;
}
for(i=0;i<n;i++)
printf("%3d",p[i].number);
free(p);
}
错误为
E:\VC6.0\22.c(11) : error C2143: syntax error : missing ';' before 'type'
E:\VC6.0\22.c(12) : error C2065: 'p' : undeclared identifier
E:\VC6.0\22.c(12) : warning C4047: '=' : 'int ' differs in levels of indirection from 'struct person *'
E:\VC6.0\22.c(15) : error C2109: subscript requires array or pointer type
E:\VC6.0\22.c(15) : error C2224: left of '.nextp' must have struct/union type
E:\VC6.0\22.c(16) : error C2146: syntax error : missing ';' before identifier 'p'
E:\VC6.0\22.c(16) : error C2109: subscript requires array or pointer type
E:\VC6.0\22.c(16) : error C2224: left of '.number' must have struct/union type
E:\VC6.0\22.c(19) : error C2109: subscript requires array or pointer type
E:\VC6.0\22.c(19) : error C2224: left of '.number' must have struct/union type
E:\VC6.0\22.c(20) : warning C4022: 'free' : pointer mismatch for actual parameter 1

Answer 1

1、C语言所有局部变量的定义都必须在函数的开头部分。
2、缺分号。
#include
#include
struct
person
{
int
number;
int
nextp;
};
main()
{
int
i,n;
struct
person
*p
=
NULL;
scanf("%d",&n);
//struct
person
*p=NULL;
//不能再此处定义，应放在函数开头部分。
p=(struct
person*)malloc(sizeof(struct
person)*n);
for(i=0;i
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