Question

i have a file of numbers like that : XXX are unknow numbers

页: 1
YY YYYY YYY YYYY
YYYY YYY YY YYY
ZZZ
UUU UU UUUU UUUUUU UU UUUU
UU UUU UUUU U

the number of numbers per lines and numbers of "line number" are unknowed. I just know how many "blocks" there is. (where a block is a number followed by several number lines)

My aims are: - extracts 页: 1and fill a tab with it - tokenize the "line number" into number and file my matrice with it

What i have yet. i read a line, but don t know if it s a single number or a line of numbers.

I tried with sscanf, to determine if there is just one number or several, but it s not conclusive. I checked also the value of ret but sscanf always return the number 1. So it s impossible to determine if there is more than just one number.

ret = sscanf(line, "%d");

我不想使用PCRE。我说,它有可能用标准的图书馆,但如何? 从果园中可以如何区分两种界线?

感谢和担忧我的办公室:

Answer 1

If your line separator is a newline () and your token separator is a whitespace (s) then read one character at a time into a buffer.

一旦你打断了两名分离者,终止缓冲,打印,重新制定缓冲指数,然后通过下一名分离者的文件阅读。

这里有一些守则:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/* 
    INT_MAX is 2147483647, and so the maximum digit 
    length is 10. We add another digit to hold a 
    null terminator.
*/

static const unsigned int kMaxNumberLength = 11;
static const char *kNumberFilename = "numbers.txt";

int main(int argc, char *argv[])
{
    FILE *fp = NULL;
    char currC, buffer[kMaxNumberLength];
    unsigned int cIndex = 0U;

    fp = fopen(kNumberFilename, "r");

    if (fp) {
        do {
            currC = fgetc(fp);
            buffer[cIndex] = currC;
            if ((currC ==    ) || (currC ==  
 )) {
                buffer[cIndex] =   ; /* terminate buffer */
                fprintf(stdout, "found number: %d
", atoi(buffer));
                cIndex = 0U;
                continue;
            }
            cIndex++;
        } while (currC != EOF);

        fclose(fp);
    }
    else
        return EXIT_FAILURE;

    return EXIT_SUCCESS;
}

请指出以下文件:<代码>编号:txt:

• 编写和管理该守则:

$ gcc -Wall test.c
$ ./a.out numbers.txt 
found number: 1234
found number: 234
found number: 567
found number: 1
found number: 4
found number: 5
found number: 9

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