void re(char *str, int len); 
void re2(char *str);

int main() 
{ 
char str[1024] = “I am from ShangHai”; 
//char str[1024] = “a b c d e f”;

re(str, strlen(str));
printf("first : |%s|\n", str);re2(str);
printf("second : |%s|\n", str);return 0;

}

void re(char *str, int len) 
{ 
int i; 
for (i = 0; i < len / 2; i++) 
{ 
char temp = str[i]; 
str[i] = str[len - i - 1]; 
str[len -i - 1] = temp; 
} 
}

void re2(char *str) 
{ 
//find word 
//start index + word’s length 
int index = 0; 
int start = 0; 
int len = 0;

for (index = 0; index <= strlen(str); index++)
{if (str[index] != ' ' && str[index] != '\0'){len++;}else{printf("start : %d  len : %d\n", start, len);// do somethingre(str + start, len);start = start + len + 1;len = 0;}   
}

}