48 lines
1.0 KiB
C
48 lines
1.0 KiB
C
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// 按行读取score.txt文件的所有内容，打印成绩及格的学号和成绩。
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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typedef struct stu_s
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{
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int sid;
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char dh; // 逗号
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float score;
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struct stu_s *next;
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} STU;
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int main()
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{
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FILE *fp = fopen("score.txt", "r");
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if (NULL == fp)
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{
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return 1;
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}
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// 计算文件大小
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fseek(fp, 0, SEEK_END);
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long file_size = ftell(fp);
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printf("score.txt 文件大小: %ld B\n", file_size);
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// 重置光标位置
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fseek(fp, 0, SEEK_SET); // 等同于使用 rewind(fp);
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// 按照 STU 的结构存储数据，计算出以存放学生数量
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int stu_num = file_size / sizeof(STU);
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printf("学生数量: %d\n", stu_num);
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printf("\n学号\t成绩\n");
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for (int i = 0; i < stu_num; i++)
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{
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STU *s = calloc(1, sizeof(STU));
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fread(s, sizeof(STU), 1, fp);
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if (s->score > 60)
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printf("%d\t%.2f\n", s->sid, s->score);
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free(s);
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}
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fclose(fp);
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return 0;
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}
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