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#include <stdio.h>
#include <string.h>

int main()
{
char str[20] = "frefernvj";
char p1[20] = {0};
strncpy(p1,str,3);
printf("%s\n",p1);

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char *p = "drbfrubfj";
char *p2 = NULL;
strncpy(p2,p,3); //´æÈë p2 ÖÐ
printf("%s\n",p2);
}