字符串hash

#include<stdio.h>

//字符串hasha
unsigned int hasha(char * url, int mod){
    unsigned int n = 0;
    char * b = (char*) &n;
    for(int i = 0; url[i]; i++)
        b[i % 4] ^= url[i];
    
    return n % mod;
}


int main(){
    char str[] = "Hello World\n";
    //char *str = "Hello World\n";是错误的
    //原因：hello world 应该被分配到了常量区中，而声明的str指针在栈里
    //而char str[] = "Hello World\n"; 字符串在栈中。
    printf("%d", hasha(str, 25013));
}