如何使用getchar在指针中存储字符？

Question

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
void main(){
   int c;
   char *p=malloc(50*sizeof( char ));
   //char *p;
   while((c = getchar()) != '\n' )
   {
       *p++ = c;
       *p='\0';
        //      printf("%s",p);
   }
   printf("\nThis is outside while %s",p);
}

我无法在外面输出，请帮忙！

Answer 1

使用索引。这将允许您修改字符串的内容而不更改指针的值。您还可以使用索引来阻止访问无效数据。

int c;
int i = 0;

char *p=malloc(50*sizeof( char ));
while((c = getchar()) != '\n' && i < 49 )
{
   p[i] = c;
   ++i;
}

p[i] = '\0';
printf("\nThis is outside while %s",p);