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# include <stdio.h># include <stdlib.h># include <string.h>int my_strlen(char *str){    if(*str == '\0')        return 0;    else        return 1+my_strlen(str+1);}char *reverse_string(char *str,int len){    if(len > 1)    {        char tmp = *str;        *str = *(str+len-1);        *(str+len-1) = tmp;        reverse_string(str+1,len-2);    }    return str;}int main(){    char str[] = "abcdefgh";    int len = strlen(str);    reverse_string(str,len);    printf("%s\n",str);    system("pause");    return 0;}