fclose() function in c

fclose():

• It is used to close the file after use.
• It is recommended to release every resource(file) after use.
• After working resource, releasing a resource is called Proper shut down.
• Improper shutdown causes loss of data.
• Prototype is:
  • int  fclose(FILE* stream);
• On success, it returns 0.
• On Failure, it returns -1.

#include<stdio.h>
int main()
{
	FILE* p;
	int r1, r2;
	
	p = fopen("code.c", "r");
	if(p != NULL)
	{
		r1 = fclose(p);
		printf("On success : %d \n", r1);
		
		r2 = fclose(p);
		printf("On failure : %d \n", r2);	
	}
	return 0;
}