int值保存初始化

[RichAndMerry]

int count = 1;//这里定义的就是一个普通的变量，而且在main函数的开头就初始化了，那就是每次运行这个程序时，count都会先被初始化为1。可是为什么第二次运行时，显示出来的count是接着上一次的数来算的？

#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#define MAX 41
int _tmain(int argc, char * argv[])
{
	FILE *fp;
	char words[MAX];
	int count = 1;
	char *count_c;

	count_c = (char*)malloc(sizeof(char) * 4);
	if ((fp = fopen("wordy", "a++")) == NULL)
	{
		fprintf(stdout, "Can't open \"wordy\" file.\n");
		exit(EXIT_FAILURE);
	}
	puts("Enter words to add to the file; press the #");
	puts("key at the begining of a line to terminate.");
	while ((fscanf(stdin, "%40s", words) == 1) && (words[0] != '#'))
		fprintf(fp, "%s\n", words);
	puts("File contents:");
	rewind(fp);
	while (fscanf(fp,"%s", words) == 1)
	{
		_itoa(count,count_c,10);
		printf("%s %s\n", count_c, words);
		++count;
	}
	puts("Done!");
	if (fclose(fp) != 0)
	{
		fprintf(stderr, "Error closing file\n");
	}
	free(count_c);
	system("PAUSE");
	return 0;
}

[赵4老师]

《程序员的自我修养——链接、装载与库》

[wang0635]

打印出来的count，是读出文件中的单词的计数。第二次运行时，文件中追加了一句话后，却又从头开始读出，当然要有前面的东西了

[RichAndMerry]

#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#define Length 20
int _tmain(int argc, char * argv[])
{
	char name[Length];
	char ch;
	int data_n[7][10] = {};
	char data_i[8][10] = {};
	FILE * fp;
	char image_n[10] = { ' ', '.', '/', '-', '+', '*', '&', '^', '#', '@' };
	int num = 0, value = 0;
	printf("Please enter the file's name:");
	scanf("%s",name);
	if ((fp = fopen(name, "r")) == NULL)
	{
		printf("Cna't open %s file.", name);
		exit(EXIT_FAILURE);
	}
	for (size_t i = 0; i < 7; i++)
	{
		for (size_t j = 0; j < 10; j++)
		{
			//fseek(fp, fp_n, SEEK_SET);
			ch = fgetc(fp);
			//ch = getc(fp);
			value = (int)(ch - '0');
			data_n[i][j] = value;
			fgetc(fp);
			//fp_n = fp_n +  2;
		}
		//fp_n = fp_n - 1;
	}
	for (size_t i = 0; i < 7; i++)
	{
		for (size_t j = 0; j < 10; j++)
		{
			num = data_n[i][j];
			data_i[i][j] = image_n[num];
		}
	}
	for (size_t i = 0; i < 10; i++)
	{
		data_i[7][i] = image_n[1];
	}
	for (si

[RichAndMerry]

0 1 2 3 4 5 6 7 8 9
1 8 7 6 5 4 3 2 1 0
2 0 0 0 2 2 2 0 0 0
3 1 2 4 5 6 7 8 6 5
4 5 4 5 4 5 4 5 4 5
5 7 7 7 7 9 9 9 9 9
6 3 3 3 4 4 4 1 1 1

[RichAndMerry]

第一次运行结果

[RichAndMerry]

第二次运行结果

[RichAndMerry]

fseek函数一般用于二进制文件，也可以用于文本文件。用于文本文件操作时，需特别注意回车换行的情况：因为在一般浏览工具如UltraEdit中，回车换行视为两个字符0x0D和0x0A，但真实的文件读写和定位时却按照一个字符0x0A进行处理，因此碰到此类问题时，可以考虑将文件整个读入内存，然后在内存中手工插入0x0D的方法，这样可以达到较好的处理效果。

[AlbertS]

不会吧，程序第二次运行。count应该还是从1开始的，你可以输出count看一下变量值

[RichAndMerry]

#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <ctype.h>
#define Length 10
#define Amount 5
int _tmain(int argc, char * argv[])
{
	struct three_name{
		char last_name[Length];
		char mid_name[Length];
		char first_name[Length];
	};
	struct member{
		char account[Length];
		struct three_name name;
	}; 
	struct member m_member[Amount] = { { "101", { "aaa", "bb2", "dccc" } }, { "202", { "abb", .mid_name = "fccc" } }, { "303", { "acc", "bb4", "hccc" } }, { "404", { "add", "bb5", "fccc" } }, { "505", { "aee", "bb6", "ccc" } } };

	system("PAUSE");
	return 0;
}