code. compile. run. debug. share.
Source Code
Language
#include <stdio.h>
#include <string.h>
#define MAX 256
int main()
{
FILE *fptr1, *fptr2;
int lno, linectr = 0;
char str[MAX],fname[MAX];
char newln[MAX], temp[] = "temp.txt";
printf("\n\n Replace a specific line in a text file with a new text :\n");
printf("-------------------------------------------------------------\n");
printf(" Input the file name to be opened : ");
fgets(fname, MAX, stdin);
fname[strlen(fname) - 1] = '\0';
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(" Input the content of the new line : ");
fgets(newln, MAX, stdin);
/* get the line number to delete the specific line */
printf(" Input the line no you want to replace : ");
scanf("%d", &lno);
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(" Replacement did successfully..!! \n");
return 0;
}
test line 1
test line 2
test line 3
test line 4
Compiling Program...
Standard Input:
Interactive Console
Text
Program is not being debugged. Click "Debug" button to start program in debug mode.
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