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C Exercises: Create a file and input text

C File Handling : Exercise-1 with Solution

Write a program in C to create and store information in a text file.

Sample Solution:

#include <stdio.h>
#include <stdlib.h>
  
int main()
{
   char str[1000];
   FILE *fptr;
   char fname[20]="test.txt";

    printf("\n\n Create a file (test.txt) and input text :\n");
	printf("----------------------------------------------\n"); 
   fptr=fopen(fname,"w");	
   if(fptr==NULL)
   {
      printf(" Error in opening file!");
      exit(1);
   }
   printf(" Input a sentence for the file : ");
   fgets(str, sizeof str, stdin);
   fprintf(fptr,"%s",str);
   fclose(fptr);
   printf("\n The file %s created successfully...!!\n\n",fname);
   return 0;
}

Sample Output:

 Create a file (test.txt) and input text :                                                                    
----------------------------------------------                                                                
 Input a sentence for the file : This is the content of the file test.txt                                     
                                                                                                              
 The file test.txt created successfully...!! 

Flowchart:

Flowchart: Create a file (test.txt) and input text

C Programming Code Editor:

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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