C language——to Replace a specified Line in a Text File

[root@localhost 桌面]# gedit tmp.c

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				// C Language to Replace a specified Line in a Text File

				#include <stdio.h>

				int main(void)
				{
				    FILE *fileptr1, *fileptr2;
				    char filechar[40];
				    char c;
				    int delete_line, temp = 1;

				    printf("Enter file name: ");
				    scanf("%s", filechar);

				    fileptr1 = fopen(filechar, "r");
				    //print the contents of file .
				    while ((c = getc(fileptr1)) != EOF)
				    {
				        printf("%c", c);
				    }

				    printf("
Enter line number to be deleted and replaced: ");
				    scanf("%d", &delete_line);

				    //take fileptr1 to start point.
				    rewind(fileptr1);
				    //open tempinterm.txt in write mode
				    fileptr2 = fopen("tempinterm.txt", "w");

				    while ((c = getc(fileptr1)) != EOF)
				    {
				        //till the line to be deleted comes,copy the content to other
				        if (temp != delete_line) {
				            putc(c, fileptr2);
				            while ((c = getc(fileptr1)) != 'n') putc(c, fileptr2);
				            putc('n', fileptr2);
				            temp++;
				        } else {
				            while ((c = getc(fileptr1)) != 'n');
				            //read and skip the line ask for new text
				            printf("Enter new text: ");

				            //flush the input stream
				            fflush(stdin);
				            getchar();    //delete blank line

				            while ((c = getchar()) != 'n') putc(c, fileptr2);
				            //take the data from user and place it in new file
				            putc('n', fileptr2);
				            temp++;
				        }
				    }

				    fclose(fileptr1);
				    fclose(fileptr2);
				    remove(filechar);
				    rename("tempinterm.txt", filechar);
				    fileptr1 = fopen(filechar, "r");
				    //reads the character from file
				    //until last character of file is encountered
				    while ((c = getc(fileptr1)) != EOF)
				    {
				        printf("%c", c);
				    }
				    fclose(fileptr1);
				    return 0;
				}

[root@localhost 桌面]# gcc tmp.c -o tmp

[root@localhost 桌面]# ./tmp
Enter file name: hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

Enter line number to be deleted and replaced: 1
Enter new text: asdf
asdf
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
[root@localhost 桌面]#

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