Write a program that reverses the words in a sentence.
Enter a sentence: you can cage a swallow can't you? Reversal of sentence: you can't swallow a cage can you?
Hint: Use a loop to read the characters one by one and store them in a one-dimensional char array. Have the loop stop at a period,question mark,or exclamation point (the “terminating character “),which is saved in a separate char variable. Then use a second loop to search backward through the array for the beginning of the last word. Print the last word,then search backward for the next-to-last word. Repeat until the beginning of the array is reached. Finally,print the terminating character.
我一直在考虑将一个单词定义为空格之间的一系列字符.因此,当到达空间时,向后移动,打印每个字符,直到找到另一个空格.我的第一个版本的程序只打印了第一个单词.它的当前版本只打印其他单词.我已经坚持了两天,所以任何帮助都真的很感激.这是我的代码,以及输出示例.希望我已正确记录我的代码.提前致谢！
码
/* Include the standard I/O library */ #include<stdio.h> /* Define main */ int main(void) { /** * Declare an array of characters storing the sentence,as well as * a character representing the current character under cursor and * the terminating character */ char sentence[100] = { ' ' },c,tc; /** * Declare a loop counter already initialized at 0,an incremental * variable,as well as the size of the read sentence */ int i = 0,j = 1,size = 0; /* Get the sentence */ printf("Enter a sentence: \n"); for(c = getchar(); (c != '.') && (c != '!') && (c != '?') && (c != '\n'); c = getchar(),i++) { sentence[i] = c; /* Store the current character in the array */ size++; /* Increase the sentence's size */ } tc = c; /* Get the terminating character */ /** * Go backward through the array,printing each sequence of characters * between spaces */ for(i = 99; i >= 0; i--) { if(sentence[i] == ' ') { while(sentence[i + j] != ' ') { printf("%c",sentence[i + j]); j++; } j = 1; /* Reset the incremental variable */ printf(" "); /* Print a tailing space */ } } /** * Delete the tailing blank space and print the terminating character,* as well as a new line */ printf("\b%c\n",tc); return 0; /* Return 0 upon successful program execution */ }
输出：
解决方法
you can cage a swallow can't you?
uoy t'nac wollaws a egac nac uoy?
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
you t'nac wollaws a egac nac uoy?
^^^
you can't wollaws a egac nac uoy?
^^^^^
you can't swallow a egac nac uoy?
^^^^^^^
you can't swallow a egac nac uoy?
^
you can't swallow a cage nac uoy?
^^^^
you can't swallow a cage can uoy?
^^^
you can't swallow a cage can you?
^^^
对于你要反转的每件事(无论是整句还是单词)：
>找到开始和结束
>交换开头和结尾字符
>一次“向内”移动
>坚持到达“中间”
由于反转字符串的块是一种常见的操作,因此将其作为自己的函数是有意义的.由于该功能需要完成其工作的唯一信息是：
>字符串
>开始索引
>结束指数
您认为该功能的参数是什么？
需要反复做的另一件常见的事情是“找到”某些东西,无论是空格还是标点符号.您可能需要自己编写,或者如果您可以使用库函数,或者想要提示,请查找：
man strcspn
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