struct数组的问题
定义结构体后,再用结构体+数组的话,数组的size值必须是个具体的数吗?以下是代码:
#include <cstdlib>
#include <iostream>

using namespace std;
struct Person
{
char name[30];
char surname[40];
int age;

};
void scan(struct Person *p)
{
printf("Give a name:");
scanf("%s",&(p->name));
printf("Give a surname;");
scanf("%s",&(p->surname));
printf("Give a age;");
scanf("%i",&(p->age));
}
void print(struct Person p)
{
printf("Name:%s\n",p.name);
printf("Name:%s\n",p.surname);
printf("Name:%i\n",p.age);
}
void scanTab(struct Person *tab,int size)
{
for(int i=0;i<size;i++)
scan(&tab[i]);


}
void printTab(struct Person *tab,int size)
{
for(int i=0;i<size;i++)

print(tab[i]);
printf("\n");

}
int main(int argc, char *argv[])
{
int n;
printf("please give me a size:");
scanf("%i",&n);
struct Person table[n];
scanTab(table,n);
printTab(table,n);
system("PAUSE");
return EXIT_SUCCESS;
}
提示的错误在这一行: struct Person table[n];
但是这个代码在DEV-C++上运行的挺好,但是在vsual c++上运行的时候就出错误了.
错误提示:
D:\Microsoft Visual Studio\MyProjects\test.cpp(47) : error C2057: expected constant expression
D:\Microsoft Visual Studio\MyProjects\test.cpp(47) : error C2466: cannot allocate an array of constant size 0
D:\Microsoft Visual Studio\MyProjects\test.cpp(47) : error C2133: 'table' : unknown size
看了半天,也不知道改哪!大家帮忙看看错哪了?
[解决办法]

引用:

 struct Person table[n];
//改成
struct Person *ptable = ( struct Person *)malloc(sizeof( struct Person) * n);

调试一下,还是不行,而且同样的两次运行,提示错误竟然不一样!

    struct Person *p table = ( struct Person *)malloc(sizeof( struct Person) * n);
    scanTab(table,n);
    printTab(table,n);
    system("PAUSE");
    return EXIT_SUCCESS;

D:\Microsoft Visual Studio\MyProjects\test.cpp(47) : error C2146: syntax error : missing ';' before identifier 'table'
D:\Microsoft Visual Studio\MyProjects\test.cpp(47) : error C2065: 'table' : undeclared identifier
D:\Microsoft Visual Studio\MyProjects\test.cpp(47) : error C2440: '=' : cannot convert from 'struct Person *' to 'int'

//改成这样吧， 楼主基础不太好！找本c语言基础书籍看看先吧！
    struct Person *ptable = ( struct Person *)malloc(sizeof( struct Person) * n);
    scanTab(ptable,n);
    printTab(ptable,n);
    system("PAUSE");
    return EXIT_SUCCESS;