c - 如何从一个字符串中一次读取两个字符并将其复制到另一个字符串中

Question

我试图从一个字符串中读取两个连续的字符，并将两两个字符传递给另一个字符串。代码如下，但它给了我段错误!我做错了什么？

char *st = malloc(16*sizeof(char));
char *string = "purpleredblue";
int i;
int x=0;

while(x<=16)
{
    for(i=x;i<=x+2;i++)
    {
        *st++=*string++;  //copies content from string to st
    }
    x+=2;
}

printf("%s\n",st);

Answer 1

你的代码完全错误。这可能会有所帮助:

char *buffer = (char*)malloc(16 * sizeof(char));
char *source = "purpleredblue";

char *dst = buffer;
char *src = source;
char *end = source + strlen(source);

while (src <= end)
{
    strncpy(dst, src, 2);

    dst += 2;
    src += 2;
}

printf("%s", buffer);