How Can I Open A File C Programming

C program, why can't I open up a file?

Where have you saved rocket1.txt? with what you have above (rocket1 = fopen("rocket1.txt", "r");) it would have to be in the same place as where your executable is. If this is visual studio you are using that will be in the debug or release subdirectory under your project.

Perhaps save it to the root and use
rocket1 = fopen("c:\\rocket1.txt", "r");
to avoid confusion.

You should also look at GetLastError and print that out to help diagnose the fail to open issue.

C programming comparing two files?

Hello. Can someone please write a C program to compare two files, byte by byte.
Please use open() instead of fopen(), read() instead of fread(). The program tells us if the files are identical or different.

I need help with C programming, please.?

LOW's response is pretty good, but it's more than you need since the problem statement said you just need to print the converted file contents to the screen, not rewrite the file.

Here's the simple way to do it:

#include
#include
#include

#define MAX_LINE_LEN 1024

int main(int argc, char *argvp[]) {
FILE *fp;
char file[MAX_LINE_LEN], c;

printf("Enter filename: ");
fgets(file,MAX_LINE_LEN,stdin);
*(strchr(file,'\n')) = '\0';
if ((fp = fopen(file,"r")) != NULL) {
while ((c = fgetc(fp)) != EOF) {
putchar(toupper(c));
}
fclose(fp);
} else {
printf("\n%s not found.\n",file);
}
return 0;
}

Sample run:

Enter filename: text3.txt
JUST A WEEK AGO, DRIVERS NATIONALLY PAID ABOUT
17 CENTS LESS FOR A GALLON OF GAS ON AVERAGE.

Where:

$ cat text3.txt
Just a week ago, drivers nationally paid about
17 cents less for a gallon of gas on average.

In C programming, what happens if we open files in binary mode with "rb" option but the files were not binary?

Nothing really for most modern Unix based operating systems. This was an opportunity for the libraries to perform any sort of translation work that might need to be done on a a given architecture to handle a text file. It might translate some characters from one code to another, handle different end of file markers, etc. but most of those differences have gone away (except the 'CR LF' of MSDOS versus the '\n' of the everyone else). This was known as an encoded file and text mode will allow the decoding, whereas binary (b) would skip the encoding and let you see it byte for byte.There might still be some of this on embedded systems, but embedded is mostly some form of Linux or other Unix and again there's probably nothing going on in text mode that isn't in binary mode. I think you'll find no difference as far as Unix is concerned. It use to make a difference on Windows and I would guess it might still today, though a Windows coder will come along and enlighten us I hope.

How do I open an excel spreadsheet file in a C program?

Several types of file formats are supported by MS Excel, xls, xlsx .Though .xls and .xlsx are not in plain text so it is difficult to read them directly in a C program. You will be required to use non-standard libraries for this purpose.Alternative solns can be : Convert your .xls or .xlsx file to .csv extension using MS Excel The .csv file generated can be opened by both MS Excel as well a simple C program because a .csv file is a plain text file in which values are separated by commas. Now, open this file in your C program using simple file handling approach.for online and better step by step guidance .you can refer :Read from excel file in CHAPPY PROGRAMMING !!

How to get to Program files in Command Prompt?

Here's a shortcut that will save you a TON of typing in CMD.

Type:
cd \prog
That should change the prompt to:
cd "\Program Files"

Now type \fl

Unless you have multiple folders that start with fl, that will leave you with:
cd "\Program Files\FlitghtGear"

If you do happen to have another folder starting with Fl, no sweat. keep hitting the tab key until you get to the one you want.

Then just hit enter to do the actual CD.

How can I write a c program to create a file?

You can use the fopen( ) function to create a new file or to open an existing file. This call will initialize an object of the type FILE, which contains all the information necessary to control the stream. The prototype of this function call is as follows:FILE *fopen( const char * filename, const char * mode );
Here, filename is a string literal, which you will use to name your file, and access mode can be read, write, append, etc.The C program is:#include
int main(){
FILE *fp;
fp=fopen("file.txt","w");
fclose(fp);
return 0;
}

What is a correct C program to open the file named "names.txt" and convert all text to uppercase letters and then display it (without using process.h)?

here is the easy way… and does not depend on using ASCI#include #include int main(void){FILE *in = fopen("names.txt", "r");// open file in read modechar c;while((c = fgetc(in)) != EOF){ // until you reach the end of the file read the next charprintf("%c",toupper( c)); // display the uppercase char13. }14. fclose(in); // close the file15.return 0;}

How to open more than one .txt file by using “fopenf” in C programming language?

How to open more than one .txt file by using “fopenf” in C programming language?

What I am trying to do is to open more than one .txt file (for example went to open: 1.txt, 2.txt and 3.txt) by putting the “fopenf” inside a “for” loop. Refer to code below*.

*The .c Code:
---
#include
#include
int main()
{
char c1[12],c2[12],c3[12],c4[12],c5[12],c6[12...
FILE *f1, *f2,*rf1;
f1 = fopen("1.txt","r");
f2 = fopen("2.txt","r");
rf1 = fopen("THE RESULTS.txt","w");
while (!feof(f1))
{
fscanf(f1,"%s%s%s%s%s%s",c1,c2,c3,c4,c5,...
printf("%s\t%s\t%s\t%s\t%s\t%s\n----...
}
fprintf(rf1,"%s\t\n",c3);
while (!feof(f2))
{
fscanf(f2,"%s%s%s%s%s%s",c1,c2,c3,c4,c5,...
printf("%s\t%s\t%s\t%s\t%s\t%s\n----...
}
fprintf(rf1,"%s\t\n",c3);
getch();
return 0;
}
---

How do I write a program in C to create a new file with a name taken from the user?

#include

int main()
{
char name[50];
FILE *fp;
printf("Enter name");
scanf("%s",name);
fp=fopen(name,"w");
fclose(fp);
return 0;
}

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