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main()
{
 char *p;
 p=" ";
 scanf("%s",p);
 printf("%s\n",p);
}
 
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p=" ";

 ¸ÃΪ p =NULL;

C/C++ code:

#include<stdio.h>
#include<stdlib.h>

int main()
{
char *p;
p = (char *)malloc(100*sizeof(char));
//p=" ";
if(p == NULL) {
printf("malloc error!\n");
exit(1);
}
scanf("%s",p);
printf("%s\n",p);
free(p);
return 0;
}



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C/C++ code:

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main()
{
char *p;//¶¨ÒåÁËÖ¸Õë
p=" ";//ÕâÀïÄãµÄÒâ˼ÊÇp=NULL°É
p=(char*)malloc(100*sizeof(char));//Ò»¶¨ÒªÉêÇ붯̬Äڴ棬³ö´í¾ÍÊÇÒòΪÕâ¸ö
scanf(


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