C Files Examples

C Flow Control?

In this tutorial, you will learn about if statement (including if...else and nested if..else) in C programming with the help of examples.

C Functions?

In this tutorial, you will be introduced to functions (both user-defined and standard library functions) in C programming. Also, you will learn why functions are used in programming.

C Programming Arrays?

In this tutorial, you will learn to work with arrays. You will learn to declare, initialize and access elements of an array with the help of examples.

C Programming Pointers?

In this tutorial, you'll learn about pointers; what pointers are, how do you use them and the common mistakes you might face when working with them with the help of examples.

C Programming Strings?

In this tutorial, you'll learn about strings in C programming. You'll learn to declare them, initialize them and use them for various I/O operations with the help of examples.

Structure And Union?

In this tutorial, you'll learn about struct types in C Programming. You will learn to define and use structures with the help of examples.

C Programming Files?

In this tutorial, you will learn about file handling in C. You will learn to handle standard I/O in C using fprintf(), fscanf(), fread(), fwrite(), fseek() etc. with the help of examples.

Additional Topics?

In this tutorial, you will learn about enum (enumeration) in C programming with the help of examples.
C Files Examples

C Files Examples

In this article, you’ll find a list of examples to handle file input/output operations in C programming.

 

To understand all programs on this page, you should have the knowledge of the following topics.


C File Examples

1. C program to read name and marks of n number of students and store them in a file.

#include <stdio.h>
int main()
{
   char name[50];
   int marks, i, num;

   printf("Enter number of students: ");
   scanf("%d", &num);

   FILE *fptr;
   fptr = (fopen("C:\\student.txt", "w"));
   if(fptr == NULL)
   {
       printf("Error!");
       exit(1);
   }

   for(i = 0; i < num; ++i)
   {
      printf("For student%d\nEnter name: ", i+1);
      scanf("%s", name);

      printf("Enter marks: ");
      scanf("%d", &marks);

      fprintf(fptr,"\nName: %s \nMarks=%d \n", name, marks);
   }

   fclose(fptr);
   return 0;
}

2. C program to read name and marks of n number of students from and store them in a file. If the file previously exits, add the information to the file.

#include <stdio.h>
int main()
{
   char name[50];
   int marks, i, num;

   printf("Enter number of students: ");
   scanf("%d", &num);

   FILE *fptr;
   fptr = (fopen("C:\\student.txt", "a"));
   if(fptr == NULL)
   {
       printf("Error!");
       exit(1);
   }

   for(i = 0; i < num; ++i)
   {
      printf("For student%d\nEnter name: ", i+1);
      scanf("%s", name);

      printf("Enter marks: ");
      scanf("%d", &marks);

      fprintf(fptr,"\nName: %s \nMarks=%d \n", name, marks);
   }

   fclose(fptr);
   return 0;
}

 

 
 

3. C program to write all the members of an array of structures to a file using fwrite(). Read the array from the file and display on the screen.

#include <stdio.h>
struct student
{
   char name[50];
   int height;
};
int main(){
    struct student stud1[5], stud2[5];   
    FILE *fptr;
    int i;

    fptr = fopen("file.txt","wb");
    for(i = 0; i < 5; ++i)
    {
        fflush(stdin);
        printf("Enter name: ");
        gets(stud1[i].name);

        printf("Enter height: "); 
        scanf("%d", &stud1[i].height); 
    }

    fwrite(stud1, sizeof(stud1), 1, fptr);
    fclose(fptr);

    fptr = fopen("file.txt", "rb");
    fread(stud2, sizeof(stud2), 1, fptr);
    for(i = 0; i < 5; ++i)
    {
        printf("Name: %s\nHeight: %d", stud2[i].name, stud2[i].height);
    }
    fclose(fptr);
}
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