请用指针的方法，编写一个函数实现把给定字符串逆序

#include #include int main() { int i,pos; char t; char str[20] = {"abcde"}; char *p = str; pos = strlen(str); for(i = 0; i < pos/2; i++) { t = *(p+i); *(p+i) = *(p+(pos-1-i)); *(p+(pos-1-i))=t; } fputs(str,stdout); printf("\n&q