我学习使用指针.
关于我写的练习代码,我有几个问题. @H_404_3@首先,如果我有以下功能代码：

//function prototype
void processCars(char *,char []);

int main(){
...
//actual callto the function
processCars(strModel[x],answer);
...
}

void processCars(char * string1,char string2[])
{
...
}

@H_404_3@如何定义此processCars函数的参数是否正确？
第一个 – char * – 是一个指向char的指针,它是字符串的起始位置(或更好的字符数组)？
第二个实际上是一个直接的字符数组.

@H_404_3@现在,假设我想通过引用传递几个字符串数组甚至结构数组.我设法创建了以下代码,但我仍然没有完全了解我正在做的事情.

typedef struct car {

    char make[10];
    char model[10];
    int year;
    int miles;

} aCar; // end type

// function prototype
void processCars( aCar *,char **,int *,int *);

//aCar * - a pointer to struct of type car 
//char **,char ** 
// int * - a pointer to integer
//  Arrays passed as arguments are passed by reference.
// so this prototype works to
//void processCars( aCar *,int [],int []);


int main(){

    aCar myCars[3]; // an array of 3 cars

    char *strMakes[3]={"VW","Porsche","Audi"}; // array of 3 pointers?
    char *strModel[3]={"Golf GTI","Carrera","TT"};
    int intYears[3]={2009,2008,2010};
    int intMilage[3]={8889,24367,5982};

    // processCars(myCars,strMakes);
    processCars(myCars,strMakes,strModel,intYears,intMilage);

return 0;
} // end main

//  char ** strMakes is a pointer to array of pointers ?
void processCars( aCar * myCars,char ** strMakes,\
                  char ** strModel,int * intYears,\
                  int * intMilage ){
}

@H_404_3@所以,我的qeustion是如何定义这个“char ** strMakes”.它是什么,它为什么适合我？

@H_404_3@我也注意到,我无法更改部分字符串,因为如果我更正(或我读过的引用)
字符串是只读的.所以,就像在python中一样,我可以使用数组索引来访问字母V：

printf("\n%c",strMakes[0][0]);

@H_404_3@但是,与python不同,我无法改变它：

strMakes[0][0]="G" // will not work? or is there a way I could not think of?

@H_404_3@所以,感谢阅读我的长篇文章以及关于指针和c字符串的许多问题.感谢您的回答.

char strMakes[3][20] = {"VW","Audi"};

/* these strings are mutable as long as you don't write past their end */
char str1[] = "VW";
char str2[] = "Porsche";
char str3[] = "Audi";
char *strMakes[3] = {str1,str2,str3};