如何逐行读取文件并获取特定的字符或整数? [英] How to read file line by line and get specific chars or ints?

问题描述

我有以下输入文件:

3(3,3)
1(5,4)
2(7,7)
V
H

我有以下代码可以打印其中的所有内容:

And I have the following code to print everything in it:

      char const * const fileName = argv[1]; /* should check that argc > 1 */
      FILE *file = fopen(fileName, "r"); /* should check the result */
      char line[256];

      while (fgets(line, sizeof(line), file)) {
         printf("%s", line);
      }

      fclose(file);

但是我只想从每一行而不是括号中检索char或int.我该怎么写呢?

But I want to only retrieve the char or the int from each line and not the brackets. How can I write something to do that?

推荐答案

您只想检查每个字符和数字，只接受字符和数字:

You just want to check on every character and number and accept only the chars and number:

const char *fileName = "C:\\file.txt";
FILE *file = fopen(fileName, "r");
int c = 0;
while ((c = fgetc(file)) != EOF) {
    if (isdigit(c) || isalpha(c) || c == '\n')
        printf("%c", c);
}
fclose(file);

结果:

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