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replace specific line in a text file c

it's A&L answered on September 10, 2022 Popularity 5/10 Helpfulness 7/10

answer replace specific line in a text file c

replace specific line in a text file c

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#include <stdio.h>
#include <string.h>

#define MAX 256

  int main()
  {
        FILE *fptr1, *fptr2;
        int lno, linectr = 0;
        char str[MAX],fname[MAX] = "text.txt";
        char newln[MAX], temp[] = "temp.txt";

		printf("\n\nC Program to Replace a Specific Line in a Text File.\n\n");
		printf("-------------------------------------------------------------\n");
		printf("-------------------------------------------------------------\n\n");

        fptr1 = fopen(fname, "r");
        if (!fptr1)
        {
                printf("Unable to open the input file!!\n");
                return 0;
        }
        fptr2 = fopen(temp, "w");
        if (!fptr2)
        {
                printf("Unable to open a temporary file to write!!\n");
                fclose(fptr1);
                return 0;
        }
        /* get the new line from the user */
        printf("\t-Input the content of the new line: ");
        fgets(newln, MAX, stdin);
        /* get the line number to delete the specific line */
        printf("\n\t-Input the number of line you want to replace: ");
        scanf("%d", &lno);

        // copy all contents to the temporary file other except specific line
        while (!feof(fptr1))
        {
            strcpy(str, "\0");
            fgets(str, MAX, fptr1);
            if (!feof(fptr1))
            {
                linectr++;
                if (linectr != lno)
                    {
                        fprintf(fptr2, "%s", str);
                    }
                    else
                    {
                        fprintf(fptr2, "%s", newln);
                    }
                }
        }
        fclose(fptr1);
        fclose(fptr2);
        remove(fname);
        rename(temp, fname);
        printf("\n\nReplacement did successfully..!! \n");
        return 0;
  }

Popularity 5/10 Helpfulness 7/10 Language c

Source: Grepper

Tags: c file line replace text

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Contributed on Sep 10 2022

it's A&L

0 Answers Avg Quality 2/10

replace specific line in a text file c

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