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c read file with read()

Ribou answered on April 30, 2020 Popularity 9/10 Helpfulness 3/10

answer c read file with read()

c read file with read()

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#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#define MAXLENGTH 256

int display(char* FILE) {
    int f = open(FILE, O_RDONLY); // we open the file in read only
    if (f == -1) { // open() returns -1 if there's an error
        perror("open");
        close(f);
        return 1;
    } else {
        char buffer[MAXLENGTH];
        int r = read(f, &buffer, MAXLENGTH);
        if(r == -1){ // read() returns -1 if there's an error
            perror("read");
            close(f);
            return 2;
        } else {
            write(1, buffer, r); 
            close(f);
            return 0;
        }
    }
}

int main(void) {
    display("file.txt");
    return 0;
}

Popularity 9/10 Helpfulness 3/10 Language c

Source: Grepper

Tags: c file

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Contributed on Sep 29 2022

Ribou

0 Answers Avg Quality 2/10

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read files in c

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#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;
}

Popularity 10/10 Helpfulness 8/10 Language c

Source: Grepper

Tags: c

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Contributed on Apr 30 2020

JJSE

0 Answers Avg Quality 2/10

read from a file c

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// 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;
}

Popularity 10/10 Helpfulness 5/10 Language c

Source: www.geeksforgeeks.org

Tags: c

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Contributed on Apr 08 2022

Snehasish Dhar

0 Answers Avg Quality 2/10

read files in c

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#include <stdio.h>

main() {
   FILE *fp;

   fp = fopen("/tmp/test.txt", "w+");
   fprintf(fp, "This is testing for fprintf...\n");
   fputs("This is testing for fputs...\n", fp);
   fclose(fp);
}
#https://moneyconvert.net/

Popularity 10/10 Helpfulness 4/10 Language c

Source: Grepper

Tags: c

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Contributed on Oct 28 2021

MONIN

0 Answers Avg Quality 2/10

read file c

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#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;
}

Popularity 10/10 Helpfulness 3/10 Language c

Source: www.programiz.com

Tags: c

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Contributed on Jan 17 2022

Eyal_Amsalem

0 Answers Avg Quality 2/10

how to read from a file in c

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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);

Popularity 10/10 Helpfulness 2/10 Language c

Source: www.cs.utah.edu

Tags: c

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Contributed on May 23 2022

KeWols

0 Answers Avg Quality 2/10

c read file with read()

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