#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;
}// C program to implement
// the above approach
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// Driver code
int main()
{
FILE* ptr;
char ch;
// Opening file in reading mode
ptr = fopen("test.txt", "r");
if (NULL == ptr) {
printf("file can't be opened \n");
}
printf("content of this file are \n");
// Printing what is written in file
// character by character using loop.
do {
ch = fgetc(ptr);
printf("%c", ch);
// Checking if character is not EOF.
// If it is EOF stop eading.
} while (ch != EOF);
// Closing the file
fclose(ptr);
return 0;
}char * buffer = 0;
long length;
FILE * f = fopen (filename, "rb");
if (f)
{
fseek (f, 0, SEEK_END);
length = ftell (f);
fseek (f, 0, SEEK_SET);
buffer = malloc (length);
if (buffer)
{
fread (buffer, 1, length, f);
}
fclose (f);
}
if (buffer)
{
// start to process your data / extract strings here...
}
#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;
}FILE *in_file = fopen("name_of_file", "r"); // read only
FILE *out_file = fopen("name_of_file", "w"); // write only
// test for files not existing.
if (in_file == NULL || out_file == NULL)
{
printf("Error! Could not open file\n");
exit(-1); // must include stdlib.h
}
// write to file vs write to screen
fprintf(file, "this is a test %d\n", integer); // write to file
fprintf(stdout, "this is a test %d\n", integer); // write to screen
printf( "this is a test %d\n", integer); // write to screen
// read from file/keyboard. remember the ampersands!
fscanf(file, "%d %d", &int_var_1, &int_var_2);
fscanf(stdin, "%d %d", &int_var_1, &int_var_2);
scanf( "%d %d", &int_var_1, &int_var_2);