在这个程序中,我想定义一个名为person的结构,以及一个插入函数,用于将一个元素插入数组中未使用的空间,该数组被声明为类型person。最后,我想将结果打印为标准输出。任何人都可以给我一个正确的错误提示吗?干杯
错误:
arrays.c:16:22: error: expected ')' before '[' token
arrays.c: In function 'main':
arrays.c:34:5: warning: implicit declaration of function 'insert'
arrays.c:41:5: warning: format '%s' expects type 'char *', but argument 2 has type 'char **'
代码
#include <stdio.h>
/* these arrays are just used to give the parameters to 'insert',
to create the 'people' array */
char *names[7]= {"Simon", "Suzie", "Alfred", "Chip", "John", "Tim",
"Harriet"};
int ages[7]= {22, 24, 106, 6, 18, 32, 24};
/* declare your struct for a person here */
typedef struct{
char name;
int ages;
} person;
static void insert (p[], char *name, int ages) {
static int nextfreeplace = 0;
/* put name and age into the next free place in the array parameter here */
person p[0] = {&name, age};
/* modify nextfreeplace here */
nextfreeplace++;
}
int main(int argc, char **argv) {
/* declare the people array here */
person p[7];
//insert the members and age into the unusage array.
for (int i=0; i < 7; i++) {
insert (p[i], &names[i], ages[i]);
p[i]= p[i+1];
}
/* print the people array here*/
for (int i=0; i < 7; i++) {
printf("%s is %d years old\n", &names[i], ages[i]);
}
return 0;
}
答案 0 :(得分:3)
第一个问题是你的结构人。您将名称声明为 char ,而它应该是 char *(指针)或 char [](数组)。
typedef struct
{
char *name; //or char name[100];
int age;
}
person;
接下来,插入 功能的参数不正确。你不需要一组人(你可以这样做,但这更简单),你想要一个指向人结构的指针,这样你就可以编辑它。
static void insert(person *p, char *name, int age)
{
p->name = name;
p->age = age;
}
最后,这是填充数组并将其打印出来的方式:
int main()
{
//names and ages...
person people[7];
for (int i = 0; i < 7; i++)
{
insert(&people[i], names[i], ages[i]);
}
for (int i = 0; i < 7; i++)
{
printf("name: %s, age: %i\n", people[i].name, people[i].age);
}
}
答案 1 :(得分:2)
参数p
存在问题。
static void insert (p[], char *name, int ages)
你忘记了它的类型(person
)。然后你重新宣布它;以下说明无效:
person p[0] = {&name, age};
在函数调用中,不使用数组,而是使用数组的情况。所以你的功能应该是:
typedef struct
{
char *name;
int ages;
} person;
static void
insert (person *p, char *s, int n)
{
p->name = s;
p->ages = n;
}
电话:
insert (&p[i], names[i], ages[i]);