#include <stdlib.h>
#include <stdio.h>
#include <string.h>void fanw(char *l, char *r)
{char* left = l;char* right = r;char temp;while (left < right){temp = *left;*left = *right;*right = temp;left++;right--;}
}
//解析出来每个单词  
void fans(char *p)
{while (*p != '\0'){char *pst = p;while (*p != '\0' && *p != ' '){p++;}fanw(pst, p - 1);p++;}
}int main()
{char p[30] = "student a am i";int len = strlen(p);printf("原字符串是：%s\n", p);printf("翻转后的字符串是：");fanw(p, p + len - 1);fans(p);printf("%s\n", p);return 0;
}

##方法2：数组

void reservestring(char a[], int x, int y)
{x = x - 1;while (x >= y){char tmp = a[x];a[x] = a[y];a[y] = tmp;x--;y++;}
}void reserve(char a[], int num)
{int x = 0;int y = 0;num += 1;while (num--){if (a[x] == ' ' || a[x] == '\0'){reservestring(a, x, y);y = x + 1;x = y;}else{x++;}}reservestring(a, strlen(a), 0);
}
int main()
{char a[] = "student a am i";reserve(a, strlen(a));printf("%s", a);system("pause");
}