如何從一個字符串中一次讀取兩個字符並將其複製到另一個字符串

Question

我試圖從一個字符串中讀取兩個連續字符並將兩個字符傳遞給另一個字符串。代碼如下，但它給我分段錯誤！我究竟做錯了什麼？

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

您的代碼是完全錯誤的。這可能有所幫助：

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);