C Program to Replace specific Line in File using File Handling

By | 01.12.2016

Replace specific Line in File


Write a C Program to Replace specific Line in File using File Handling. Here’s simple Program to Replace specific Line in File using File Handling in C Programming Language.


Below is the source code for C Program to Replace specific Line in File using File Handling which is successfully compiled and run on Windows System to produce desired output as shown below :


SOURCE CODE : :


/*  C Program to Replace specific Line in File using File Handling  */

#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");
    c = getc(fileptr1);
    //print the contents of file .
    while (c != EOF)
    {
        printf("%c", c);
        c = getc(fileptr1);
    }
    printf(" \n Enter line number to be deleted and replaced :: ");
    scanf("%d", &delete_line);
    //take fileptr1 to start point.
    rewind(fileptr1);
    //open replica.c in write mode
    fileptr2 = fopen("C:\\Users\\acer\\Documents\\file5.txt", "w");
    c = getc(fileptr1);
    while (c != EOF)
    {
        if (c == 'n')
        {
            temp++;
        }
        //till the line to be deleted comes,copy the content to other
        if (temp != delete_line)
        {
            putc(c, fileptr2);
        }
        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);
            putc('n', fileptr2);
            //put 'n' in new file
            while ((c = getchar()) != 'n')
                putc(c, fileptr2);
            //take the data from user and place it in new file
            fputs("n", fileptr2);
            temp++;
        }
        //continue this till EOF is encountered
        c = getc(fileptr1);
    }
    fclose(fileptr1);
    fclose(fileptr2);
    remove(filechar);
    rename("C:\\Users\\acer\\Documents\\file5.txt", filechar);
    fileptr1 = fopen(filechar, "r");
    //reads the character from file
    c = getc(fileptr1);
    //until last character of file is encountered
    while (c != EOF)
    {
        printf("%c", c);
        //all characters are printed
        c = getc(fileptr1);
    }
    fclose(fileptr1);
    return 0;
}

Above is the source code for C Program to Replace specific Line in File using File Handling which is successfully compiled and run on Windows System.The Output of the program is shown above .

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About Tunde A

My name is Tunde Ajetomobi, a Tech Enthusiast and Growth Hacker. I enjoy creating helpful content that solves problem across different topics. Codezclub is my way of helping young aspiring programmers and students to hone their skills and find solutions on fundamental programming languages.

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