C Files Examples: In this article, you’ll discover a rundown of examples to handle file input/output tasks in C programming.
To understand all projects on this page, you ought to have the knowledge of the following topics.
• File I/O
C File Examples
1. C program to read names 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 it 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);
}
Please feel free to give your comment if you face any difficulty here.
