Char pointer assignment segment fault

#include <stdio.h>
#include <stdlib.h>
int main(){
 char *str="abcdce";
 char c='c';
 char *pfast=str,*pslow=str;
 while(*pfast!='\0'){
     if(*pfast==c){
       pfast++;
       *pslow=*pfast; //error here when pfast reaches the first 'c'
     }
    pfast++;
    pslow++;
 }
 *pslow='\0';
 return 0;
}

segment fault when it runs to the assignment statement of "*pslow=*pfast;"...

Somebody tell me why, t开发者_如何学JAVAhanks in advance!

You are trying to change a string literal which leads to undefined behavior.

Change

char *str="abcdce";

to

char str[] ="abcdce";