#include<stdio.h>
int main(){	FILE *out=fopen("name_of_file.txt","w");	fputs("Hello File",out);	fclose(out);	return 0;
}

#include<stdio.h>
int main(){	FILE *in=fopen("name_of_file.txt","r");	char c;	while((c=fgetc(in))!=EOF)	putchar(c);	fclose(in);	return 0;
}

//////WRITE
#include <stdio.h>
#include <stdlib.h>
int main()
{ int num; FILE *fptr; // use appropriate location if you are using MacOS or Linux fptr = fopen("C:\\program.txt","w"); if(fptr == NULL) { printf("Error!"); exit(1); } printf("Enter num: "); scanf("%d",&num); fprintf(fptr,"%d",num); fclose(fptr); return 0;
}
//////READ
#include <stdio.h>
#include <stdlib.h>
int main()
{ int num; FILE *fptr; if ((fptr = fopen("C:\\program.txt","r")) == NULL){ printf("Error! opening file"); // Program exits if the file pointer returns NULL. exit(1); } fscanf(fptr,"%d", &num); printf("Value of n=%d", num); fclose(fptr); return 0;
}

 [...] printf("Enter name: \n"); if (fgets(name, sizeof name, stdin)) { fputs(name,fileptr); fclose(fileptr); printf("File write was successful\n"); } else { printf("Read error.\n"); }