第一次在这个论坛发帖,但不是第一次浏览这个论坛!非常有用的帖子,现在我觉得是时候寻求一些帮助了,所以提前感谢那些可以帮助我的人。
我有以下几行代码:输入时会颠倒单词的顺序。
即 输入:你好,我是 bat 侠 输出: bat 侠我在吗你好
现在我想允许用户能够输入多个字符串,即“你好,我是 bat 侠”; '' Hello World '' ;等等。理想情况下,输入时用分号分隔并用分号进行解析。
代码:
#include <stdio.h>
/* function prototype for utility function to
reverse a string from begin to end */
/*Function to reverse words*/
void reverseWords(char* s)
{
char* word_begin = NULL;
char* temp = s; /* temp is for word boundry */
/*STEP 1 of the above algorithm */
while (*temp) {
/*This condition is to make sure that the string start with
valid character (not space) only*/
if ((word_begin == NULL) && (*temp != ' ')) {
word_begin = temp;
}
if (word_begin && ((*(temp + 1) == ' ') || (*(temp + 1) == '\0'))) {
reverse(word_begin, temp);
word_begin = NULL;
}
temp++;
} /* End of while */
/*STEP 2 of the above algorithm */
reverse(s, temp - 1);
}
/* UTILITY FUNCTIONS */
/*Function to reverse any sequence starting with pointer
begin and ending with pointer end */
void reverse(char* begin, char* end)
{
char temp;
while (begin < end) {
temp = *begin;
*begin++ = *end;
*end-- = temp;
}
}
/*
int main( void )
{
int i, n;
printf("Enter no of strings:");
scanf("%i", &n);
char **str = (char **) malloc( n* sizeof(char*));
for (i = 0; i < n; i++) {
str[i] = (char*) malloc(100);
fgets(str[i],100,stdin);
}
for (i = 0; i < n; i++) {
printf("%s", str[i]);
}
for (i = 0; i < n; i++) {
free(str[i]);
}
free(str);
return 0;
}
*/
/* Driver function to test above functions */
int main()
{
char str[50];
char* temp = str;
printf("Enter a string : ");
gets(str);
reverseWords(str);
printf("%s", str);
return(0);
}
最佳答案
使用 strtok
如评论之一所述,您可以这样做:
void reverseSentence(char* sent){
char *argv[25]; // This assumes you have a max of 25 words
int argc = 0;
char* token = strtok(sent, " ");
while (token != NULL) {
argv[argc] = malloc(100); // This assumes each word is 99 characters at most
strcpy(argv[argc++], token);
token = strtok(NULL, " ");
}
for(int z = argc-1; z>=0; z--)
fprintf(stdout, "%s ", argv[z]);
fprintf(stdout, "\n");
}
警告!我没有测试代码,所以你可能有一些错误...比如缺少分号、变量名称不匹配等等...
关于c - 在C中输入和反转多个字符串?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/53426980/