can not get this to work

[rko786]

#include <stdio.h>
#include <math.h>

int main() {


float temp_c, temp_f, result;
int i;
FILE *outputFilePtr;
outputFilePtr = fopen("output.txt", "w"); //

fprintf(outputFilePtr, "Temperature(C) Speed\n");


for (i = 0; i<100; i++)
{
temp_f = (1.8 * i) + 32; // convert from C to F


result = (5 * temp_f) + 2297;
result = result / 2457;
result = 325.8*sqrt(result);

fprintf(outputFilePtr, "%3d %8.4f\n", i, result);
}

getchar();
getchar();

return 0;
}

[rafae11]

#include <stdio.h>
#include <math.h>
#include <fstream>

int main() {


	float temp_c, temp_f, result;
	int i;
	std::ofstream file;
	file.open("output.txt");
	
	file << "Temperature(C) Speed\n"; 
	
	for (i = 0; i<100; i++)
	{
		temp_f = (1.8 * i) + 32; // convert from C to F


		result = (5 * temp_f) + 2297;
		result = result / 2457;
		result = 325.8*sqrt(result);

		file << i << " " << result << "\n";		
	}

	file.close();

	getchar();
	getchar();

	return 0;
}

[rko786]

thanks for that but nothing appears on the console with this c code

[ne555]

std::cout << "Of course not, you are not printing to the console.\n";

[rko786]

sorry i'm not very good with c

C++ i'm ok

so i don't understand the above

[rko786]

if not how would i

[ne555]

fprintf(outputFilePtr, "%3d %8.4f\n", i, result);  /*prints to a file*/
printf("%3d %8.4f\n", i, result); /*print to the console*/

Also

$ ./prograrm.bin | tee file

[rko786]

#include <stdio.h>
#include <math.h>
#include <fstream>

int main() {


float temp_c, temp_f, result;
int i;
std::ofstream file;
file.open("new.txt");
FILE *outputFileptr;


file << "Temperature(C) Speed\n";

for (i = 0; i<100; i++)
{
temp_f = (1.8 * i) + 32; // convert from C to F


result = (5 * temp_f) + 2297;
result = result / 2457;
result = 325.8*sqrt(result);
fprintf(outputFileptr ,"%3d %8.4f\n", i, result); /*prints to a file*/
printf("%3d %8.4f\n", i, result);

file << ("%3d %8.4f\n", i, result);
}

file.close();

getchar();
getchar();

return 0;
}

[rko786]

i have this and still no luck

am novice at this

sorry

[rko786]

i keep getting a error with outputfileptr in line 27

[AbstractionAnon]

Line 25: Where do you initialize (open) outputFileptr?

PLEASE USE CODE TAGS (the <> formatting button) when posting code.
It makes it easier to read your code and also easier to respond to your post.
http://www.cplusplus.com/articles/jEywvCM9/
Hint: You can edit your post, highlight your code and press the <> formatting button.

[rko786]

#include <stdio.h>
#include <math.h>
#include <fstream>

int main() {


	float temp_c, temp_f, result;
	int i;
	std::ofstream file;
	FILE *outputFileptr ;
	fprintf(outputFilePtr, "%3d %8.4f\n", i, result);

outputFilePtr = fopen("new.txt", "w");


	file << "Temperature(C) Speed\n";

	for (i = 0; i<100; i++)
	{
		temp_f = (1.8 * i) + 32; // convert from C to F


		result = (5 * temp_f) + 2297;
		result = result / 2457;
		result = 325.8*sqrt(result);
		
	
		printf("%3d %8.4f\n", i, result); 


	}

	file.close();
	 
	getchar();
	getchar();

[rafae11]

open the folder where you executable is located you should see a file called new with the populated data.

if you are using visual studio add to the preprocessor _CRT_SECURE_NO_WARNINGS

// ConsoleApplication6.cpp : Defines the entry point for the console application.
//

#include <stdio.h>
#include <stdlib.h>  /* For exit() function */
#include <math.h>


int main() 
{

	float temp_c, temp_f, result;
	int i;
	
	FILE *outputFileptr ;
	outputFileptr = fopen("new.txt","w");
                
        printf("%s","Temperature(C) Speed\n");

	fprintf(outputFileptr,"%s", "Temperature(C) Speed\n");

	for (i = 0; i<100; i++)
	{
		temp_f = (1.8 * i) + 32; // convert from C to F


		result = (5 * temp_f) + 2297;
		result = result / 2457;
		result = 325.8*sqrt(result);
		
	
                printf("%3d %8.4f\n", i, result); /*print to the console*/
		fprintf(outputFileptr, "%3d %8.4f\n", i, result);


	}

	fclose(outputFileptr);
	 
	getchar();
	getchar();

	return 0;
}

[rko786]

i have copied this code and used _CRT_SECURE_NO_WARNINGS

but the console is blank now

if i don't use _CRT_SECURE_NO_WARNINGS

i get my results but no print

[rafae11]

of course it is meant to be blank. because your are not telling it to print to the console.
I have updated the code so that it prints to console also.

[rko786]

thanks for that

i'm sorry am new to this

so now outputFileptr = fopen("new.txt", "w");

it doesn't open or print to the file

[rko786]

sorry for all the questions

[rafae11]

what error messages are you getting?

[rko786]

none it runs but no text file is been open

[rafae11]

it does open it and write to it you just don't see it.

if you want a text editor to open it that is a different issue.

http://www.cplusplus.com/forum/beginner/6033/