String allocation seg fault - 爲什麼會發生這種情況？

Question

可能重複：
Getting Segmentation Fault

/* Reverse a string in place 
*/ 
#import <stdio.h> 

void reverse(char * str); 

int main() 
{ 
    char * string = "This is a string."; 
    printf("%s\n", string); 
    reverse(string); 
    printf("%s\n", string); 
} 

void reverse(char * str) 
{ 
    char * start = str; 
    char * end = str; 
    if(0==*str) 
     return; 

    //Find the end 
    for(;0 != *(++end);); 

    end--; 
    do 
    { 
     *end = *end^*start; 
     *start = *end^*start; 
     *end = *end^*start; 
    }while(++start < --end); 
} 

我不知道爲什麼這賽格故障。是因爲我用一個常量字符串初始化我的char *？

Answer 1

您正試圖修改字符串常量。替換：

char * string = "This is a string."; 

與

char string[] = "This is a string."; 

來補救。