Why does it prints that the size of char is 4 byte? [duplicate]

问题

This question already has answers here:

malloc in C: same sizeof before and after? (5 answers)

Determine size of dynamically allocated memory in C (15 answers)

Closed 6 days ago.

In this program I have located char pointer. I have located 1 byte of memory in heap. But when I print its size it shows 4 bytes. please help.

//CODES//

#include <stdio.h>
#include <stdlib.h>
int main(){
char *ptr;
ptr=(char*)malloc(1);
printf("The size is %d.",sizeof(ptr));
}

来源：https://stackoverflow.com/questions/64962528/why-does-it-prints-that-the-size-of-char-is-4-byte