fprintf() in C

fprintf():

• A pre-defined function belongs to stdio.h header file.
• A function is used to write set of characters into file.
• This function is used to write stream with specific format.
• printf() function write the data on console where fprintf() do the same thing in file.
• fprintf() function has an additional argument which is a file pointer to the file where the formatted output will be written.
• On success, it returns the total number of characters written to the file. On error, it returns EOF.

Syntax:

int fprintf(FILE *stream, const char *format [, argument, …]) 

#include <stdio.h>
int main()
{
	FILE *file;
	file = fopen("tutipy.txt", "w");
	fprintf(file, "fprintf() function explained by tutipy...\n");
	fclose(file);
	return 0;
}

fscanf():

• It is pre-defined in stdio.h
• It is used to read the stream from the file.
• It reads a word from the file and returns EOF at the end of file.

Syntax:

int fscanf(FILE *stream, const char *format [, argument, …]) 

#include <stdio.h>
int main()
{
	FILE *file;
	char arr[255];
	file = fopen("tutipy.txt", "r");
	while(fscanf(file, "%s", arr)!=EOF)
	{
		printf("%s ", arr);
	}
	fclose(file);
	return 0;
}

Program to Store Employee Data:

#include <stdio.h>
int main()
{
	FILE *fptr;
	int id;
	char name[30];
	float salary;
	fptr = fopen("emp.txt", "w+");
	if (fptr == NULL)
	{
		printf("File does not exists \n");
		return;
	}
	printf("Enter the id\n");
	scanf("%d", &id);
	fprintf(fptr, "Id= %d\n", id);
	
	printf("Enter the name \n");
	scanf("%s", name);
	fprintf(fptr, "Name= %s\n", name);
	
	printf("Enter the salary\n");
	scanf("%f", &salary);
	fprintf(fptr, "Salary= %.2f\n", salary);
	fclose(fptr);
	return 0;
}