相关疑难解决方法(0)

我在学习sizeof,这让我很沮丧.我决定这样做.

#include<stdio.h>
#include<string.h>
int main(){
    char *myWord="PIZZA";
    printf ("The size of P is...:%d\n",sizeof("P"));
    printf ("The size of I is...:%d\n",sizeof("I"));
    printf ("The size of Z is...:%d\n",sizeof("Z"));
    printf ("The size of A is...:%d\n",sizeof("A"));
    printf ("The size of R is...:%d\n",sizeof("R"));
    printf ("The size of PIZZA is...:%d\n",sizeof("PIZZA"));
    printf ("The size of *PIZZA is..:%d\n",sizeof(myWord));
    return 0;
}

我很惊讶地看到结果:

The size of P is...:2
The size of I is...:2
The size of Z is...:2
The size of A is...:2
The size of R is...:2 …

请考虑以下代码

#include <stdio.h>

void print(char string[]){
 printf("%s:%d\n",string,sizeof(string));
}

int main(){
 char string[] = "Hello World";
 print(string);
}

而输出是

Hello World:4

那有什么不对呢？

#include "usefunc.h" //don't worry about this -> lib I wrote
int main()
{
  int i;
  string given[4000], longest = "a"; //declared new typdef. equivalent to 2D char array
  given[0] = "a";
  printf("Please enter words separated by RETs...\n");
  for (i = 1; i < 4000 && !StringEqual(given[i-1], "end"); i++)
    {
      given[i] = GetLine();
      /*
      if (sizeof(given[i]) > sizeof(longest))
    {
      longest = given[i];
    }
      */
      printf("%lu\n", sizeof(given[i])); //this ALWAYS RETURNS EIGHT!!!
    }
  printf("%s", longest);
}

它为什么总是返回8 ???