C Exercises: Write multiple lines in a text file and read the file

Last update on March 20 2025 12:32:32 (UTC/GMT +8 hours)

3. Write Multiple Lines to File

Write a program in C to write multiple lines to a text file.

Sample Solution:

C Code:

#include <stdio.h>

int main ()
{
  FILE * fptr;
  int i,n;
  char str[100];
  char fname[20]="test.txt";
  char str1;
  
    printf("\n\n Write multiple lines in a text file and read the file :\n");
	printf("------------------------------------------------------------\n");   
	printf(" Input the number of lines to be written : ");
	scanf("%d", &n);
	printf("\n :: The lines are ::\n");
	fptr = fopen (fname,"w"); 
	for(i = 0; i < n+1;i++)
		{
		fgets(str, sizeof str, stdin);
		fputs(str, fptr);
		}
  fclose (fptr);
/*-------------- read the file -------------------------------------*/
	fptr = fopen (fname, "r");  
	printf("\n The content of the file %s is  :\n",fname);
	str1 = fgetc(fptr);
	while (str1 != EOF)
		{
			printf ("%c", str1);
			str1 = fgetc(fptr);
		}
    printf("\n\n");
    fclose (fptr);
    return 0;
}

Sample Output:

  Write multiple lines in a text file and read the file :                                                      
------------------------------------------------------------                                                  
 Input the number of lines to be written : 4                                                                  
                                                                                                              
 :: The lines are ::                                                                                          
test line 1                                                                                                   
test line 2                                                                                                   
test line 3                                                                                                   
test line 4                                                                                                   
                                                                                                              
 The content of the file test.txt is  :                                                                       
                                                                                                              
test line 1                                                                                                   
test line 2                                                                                                   
test line 3                                                                                                   
test line 4

Flowchart:

For more Practice: Solve these Related Problems:

Write a C program to write multiple lines entered by the user to a file, then append a summary line at the end.
Write a C program to write a list of strings stored in an array to a file, one string per line.
Write a C program to write user-provided paragraphs to a file and separate each paragraph with a blank line.
Write a C program to accept multiple lines from the user and write them to a file while numbering each line.

C Programming Code Editor:

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