This is a question about the c language.
Declares the character array char text[] = "It is good to see you. Thank you for coming."; and
We are creating a program that divides text strings into words and outputs them as standard.
The rule does not print spaces or periods, and the words to be printed are '[' and ']'
one word per line.
It is a program called that is enclosed in .
You can also create words on the assumption that they are separated by a single character space.
A character string such as strtok is created without using a function for dividing it.Calling external programs is also not allowed
It is assumed that
str[0]—It
str[1]—is
str[2]—[good]
str[3]—To
str[4]—See
str[5]—You.
str[6]—Thank
str[7]—You
str[8]—For
str [9]—[coming.]
Press any key to continue.
This is what you did when you ran the program.
However, please remove the space and period from the teacher.
I've tried various sites, but I can't get a reply. What should I do?
This is my first question, so I'm sure you're not familiar with it, but I appreciate your cooperation
int main (void)
{
inti;
char text[] = "It is good to see you. Thank you for coming.";
char str[10][256+1];
char*s,*d;
s=text;
for (i=0; i<10;i++)
{
d = str[i];
while(*d++=*s++)!=_SPACE)
{
}
*d = '\0';
}
for (i=0; i<10;i++)
{
printf("str[%d]:[%s]\n", i, str[i]);
}
}
I looked at various sites and tried adding #define_SPACE0x20, but it didn't work.
It is difficult to parse with a fixed length array.
Once you get used to it, variable-length data structures are easier.
Always be aware of out-of-range access when turning the pointer in a loop.
Then try to write a test (if you haven't done it, remember it).
#include<stdio.h>
# include<stdbool.h>
# include <string.h>
# include <cttype.h>
# include <assert.h>
// Let's not use magic numbers.
enum {
SPACE=',
PERIOD = '.'',
TOKENS_SIZE=10,
TOKEN_SIZE = 255,
};
// Let's name the data structure correctly.
static char tokens [TOKENS_SIZE] [TOKENS_SIZE+1];
/**
* If the character is skipped, return true, otherwise false.
*/
static bool
is_skip_char(char){
return ch==SPACE||ch==PERIOD;
}
/**
* skip a character to be skipped
*/
static void
skip(const char**pt){
for(;is_skip_char(**pt);++*pt){
}
}
/**
* Write a comment on the function.
*/
static void
split(const char*text){
// Initialize state
for(inti=0;i<TOKENS_SIZE;++i){
tokenens[i][0]='\0';
}
const char*pt=text;
skip(&pt);// skip the characters to skip at the beginning of the line
// Be aware of access outside the pointer and write code.
for(inti=0;i<TOKENS_SIZE&*pt;++i){
char*tok=tokens[i];
char*tokend=tok+TOKEN_SIZE;//Prevent out-of-range access
for (;tok<tokend&*pt;){
if(is_skip_char(*pt)){
break;
}
*tok++=*pt++;
}
skip (&pt);
*tok='\0';
}
}
/**
* Let's separate the analysis and the output.
*/
static void
show(void){
for(inti=0;i<TOKENS_SIZE;++i){
printf("tokens[%d]:[%s]\n", i,tokens[i]);
}
}
/**
* Let's write a test.
*/
static void
test(void){
split("Hi Bob.Hi Michael";
assert(!strcmp(tokens[0], "Hi"));
assert(!strcmp(tokens[1], "Bob"));
assert(!strcmp(tokens[2], "Hi"));
assert(!strcmp(tokens[3], "Michael"));
split("abc def..ghijkl");
assert(!strcmp(tokens[0], "abc"));
assert(!strcmp(tokens[1], "def"));
assert(!strcmp(tokens[2], "ghi"));
assert(!strcmp(tokens[3], "jkl"));
split("abcd");
assert(!strcmp(tokens[0], "abcd"));
US>assert(!strcmp(tokens[1], ""));
split(".abcd";
assert(!strcmp(tokens[0], "abcd"));
US>assert(!strcmp(tokens[1], ""));
split("abcd.");
assert(!strcmp(tokens[0], "abcd"));
US>assert(!strcmp(tokens[1], ""));
split("";
US>assert(!strcmp(tokens[0], ""));
US>assert(!strcmp(tokens[1], ""));
split("...");
US>assert(!strcmp(tokens[0], ""));
US>assert(!strcmp(tokens[1], ""));
split(".");
US>assert(!strcmp(tokens[0], ""));
US>assert(!strcmp(tokens[1], ""));
split(".");
US>assert(!strcmp(tokens[0], ""));
US>assert(!strcmp(tokens[1], ""));
}
int
main(void){
// Let's not write long codes for the main function.
split("It is good to see you. Thank you for coming.");
show();
// Let's do a test.
test();
// Let's turn it back.
return 0;
}
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