有趣的C语言--字符串与数组和指针的秘密

1、初始化

我们可以通过下面方式来初始化一个字符串

char arr[] = "this is array"; char * pointer = "this is pointer";

2、输出

1.数组符号方式

for(i=0;i<6;i++) putchar(arr[i]); putchar('\n'); for(i=0;i<6;i++) putchar(pointer[i]);

输出如下

this i this i

2.指针加法方式

for(i=0;i<6;i++) putchar(*(arr+i)); putchar('\n'); for(i=0;i<6;i++) putchar(*(pointer+i));

输出如下

this i this i

3.增量运算符

指针用增量运算符,数组用for循环输出每个char

while(*(pointer) != '\0') putchar(*(pointer++));

输出如下

this is pointer

3、修改数据

数组修改数据方法如下

arr[5] = 'z'; printf("this is array"); printf(": chang to %ss \n","this is array"); printf("%s",arr);

输出如下

this is array: chang to this is array this zs array

指针修改的话，会存在问题，可能有些编译器会直接编译不通过

pointer[5] = 'z'; printf("this is pointer"); printf(": chang to %ss \n","this is pointer"); printf("%s",pointer);

如果编译通过，可能会有如下输出

this zs pointer: chang to this zs pointer this zs pointer

这原因可能为，编译器用相同地址来替代this is pointer。所以，我们printf("this is pointer");中的字符串的指向地址也是pointer，所以我们对pointer的修改也会影响到最后的结果。

4、字符串数组

char arrs[3][20]={"this is arr1","this is arr2","this is arr3"}; char * pointers[3]={"this is pointer1","this is pointer2","this is pointer3"}; printf("%s\n",arrs[1]); printf("%s\n",pointers[1]);

输出如下，指针数组的3对应arrs[3][20]中的3

this is arr2 this is pointer2

源码地址：https://github.com/oDevilo/C