egmentation fault C语言

Question

问题遇到的现象和发生背景

有问题

C语言代码

#include<stdio.h>
#include<string.h>
void swap(char *x, char *y){
    char temp = *x; 
    *x = *y; 
    *y = temp;
}


void main(){
    char *str = "apple";
    swap(str, str+4);
} 

报错截图：

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Answer 1

 #include<stdio.h>
     #include<string.h>
     void swap(char *x, char *y){
         char temp = *x; 
         *x = *y; 
         *y = temp;
     }
      
      
     int main()
     {
         char str[] = "apple";
         swap(str, str+4);
         printf("%s", str); 
     }