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

C File Handling : Exercise-3 with Solution

Write a program in C to write multiple lines in 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:

Flowchart: Write multiple lines in a text file and read the file

C Programming Code Editor:

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Previous: Write a program in C to read an existing file.
Next: Write a program in C to read the file and store the lines into an array.

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C Programming: Tips of the Day

Difference between signed / unsigned char :

There's no dedicated "character type" in C language. char is an integer type, same (in that regard) as int, short and other integer types. char just happens to be the smallest integer type. So, just like any other integer type, it can be signed or unsigned.

It is true that (as the name suggests) char is mostly intended to be used to represent characters. But characters in C are represented by their integer "codes", so there's nothing unusual in the fact that an integer type char is used to serve that purpose.

The only general difference between char and other integer types is that plain char is not synonymous with signed char, while with other integer types the signed modifier is optional/implied.

Ref : https://bit.ly/3esiVjT