大家好我有一个文本文件,称为dictionary.txt.基本上我正在做两个选项的菜单,1.在字典中添加新单词和2.从字典中删除单词.现在我设法做菜单并添加新单词.但是,我无法从文件中删除.我希望当用户输入例如"runners"时,在dictionary.txt中搜索该单词并将其删除.告诉你我在学校尚未涉及的所有内容,但我在这里寻找一些想法,以便我可以继续完成任务.我已经尝试了一些东西,但正如我已经告诉过你的那样,我还没有覆盖它,所以我不知道如何实际做到这一点.我感谢所有的帮助.以下是我的计划.
Josuel,取自Richard Urwin先前回答的问题
您可以使用以下代码:
#include <stdio.h>
int main()
{
FILE *fileptr1, *fileptr2;
char filename[40];
char ch;
int delete_line, temp = 1;
printf("Enter file name: ");
scanf("%s", filename);
//open file in read mode
fileptr1 = fopen("c:\\CTEMP\\Dictionary.txt", "r");
ch = getc(fileptr1);
while (ch != EOF)
{
printf("%c", ch);
ch = getc(fileptr1);
}
//rewind
rewind(fileptr1);
printf(" \n Enter line number of the line to be deleted:");
scanf("%d", &delete_line);
//open new file in write mode
fileptr2 = fopen("replica.c", "w");
ch = getc(fileptr1);
while (ch != EOF)
{
ch = getc(fileptr1);
if (ch == '\n')
{
temp++;
}
//except the line to be deleted
if (temp != delete_line)
{
//copy all lines in file replica.c
putc(ch, fileptr2);
}
}
fclose(fileptr1);
fclose(fileptr2);
remove("c:\\CTEMP\\Dictionary.txt");
//rename the file replica.c to original name
rename("replica.c", "c:\\CTEMP\\Dictionary.txt");
printf("\n The contents of file after being modified are as follows:\n");
fileptr1 = fopen("c:\\CTEMP\\Dictionary.txt", "r");
ch = getc(fileptr1);
while (ch != EOF)
{
printf("%c", ch);
ch = getc(fileptr1);
}
fclose(fileptr1);
scanf_s("%d");
return 0;
}
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