追加人物到字符数组在C [英] Appending Character to Character Array In C

问题描述

我要追加一个字符一个字符数组，重新presents的String。
我使用的是结构来重新present字符串。

 结构字符串
{
    字符* C;
    INT长;
    INT最大长度;}串;
 

的realloc 是搞乱我的数组;当我打印我的字符串，它从内存中打印随机的东西。
我觉得我做的realloc失去了参考我的字符串。

 无效appendChar（字符串*目标，焦三）
    {
        的printf（\\字符串：％S \\ n，靶子＆GT; C）; //正确打印字符串。        INT newSize =靶子＆GT;长度+ 1;
        靶子＆GT;长度= newSize;        如果（newSize＆GT;＆靶子GT;最大长度）
        {
           //销毁我的字符串。
            靶子＆GT; C =（的char *）realloc的（目标，newSize *的sizeof（字符））;
            靶子＆GT;最大长度= newSize;
        }
        靶子＆GT; C [newSize-1] = CH;
        靶子＆GT; C [newSize] ='\\ 0';        的printf（字符串：％S \\ n，靶子＆GT; C）;
    }
 

解决方案

你对你的整体结构apllying realloc的目标，你应该做的：

 靶子＆GT; C =（字符*）的realloc（靶子＆℃，newSize *的sizeof（字符））;
 

I want to Append a character to a character array which represents a String. I am using a Struct to represent the String.

struct String
{   
    char *c;  
    int length;   
    int maxLength;  

}String;

realloc is messing up my array; when I print my string, it prints random things from memory. I feel that I am losing the reference to my string by doing realloc.

    void appendChar(String *target, char c)
    {
        printf("\String: %s\n", target->c); // Prints the String correctly.     

        int newSize = target->length + 1;
        target->length = newSize;

        if(newSize > target->maxLength)
        {
           // Destroys my String.
            target->c= (char*) realloc (target, newSize * sizeof(char));
            target->maxLength = newSize;
        }


        target->c[newSize-1] = ch;
        target->c[newSize] = '\0';

        printf("String: %s\n", target->c); 
    }

解决方案

You're apllying realloc on your whole structure target, you should do :

target->c= (char*) realloc (target->c, newSize * sizeof(char));

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