include<stdio.h> include<string.h> int last_len(char *str){ int i = strlen(str) - 1; //数组最后一个元素下标 int N = 0; char word = 0; word = str[i]; while(word == ' ') //如果输入的字符串最后含有空格 { i--; word = str[i]; } while(1) { word = str[i]; if...