November 2015 – Jason R. Ralph

Every once in a while I will get this urge to want to learn some C, C++. I am versed in Python and know my way around bash / Shell scripting like the back of my hand. But as always I am continuing to learn and self teaching myself is how learn the “BEST IS IS”.

Anyway let’s get to it, I wanted a program that would prompt a user for a sentence and then take that sentence and write it to a file, the program would have to create the file if it did not exist. Let me show you the code and attempt to break it down.

jralph@JRALPH2-NB ~
$ cat file_open.c
// Here we do our std library includes to allow the std::library functionality 
#include<stdio.h>
#include<stdlib.h>

// Here is where we declare our main function
int main()
{

        char c[1024];
        FILE *fptr;
        fptr=fopen("output.txt","w");
        if(fptr==NULL){
                printf("Error!!!");
                exit(1);
        }
        printf("Enter a string you wish to write to a file:\n");
        gets(c);
        fprintf(fptr,c);
        fclose(fptr);
        return 0;
}

jralph@JRALPH2-NB ~

$ cat file_open.c

// Here we do our std library includes to allow the std::library functionality

#include<stdio.h>

#include<stdlib.h>

// Here is where we declare our main function

int main()

{

char c[1024];

FILE *fptr;

fptr=fopen("output.txt","w");

if(fptr==NULL){

printf("Error!!!");

exit(1);

}

printf("Enter a string you wish to write to a file:\n");

gets(c);

fprintf(fptr,c);

fclose(fptr);

return 0;

}

Jason R. Ralph

Linux All Day Everyday

Month: November 2015

Coding in the dark

C Code Learn – Open file write user input to it