First prog, using functions that pass values...

boousaf · #1 27-Sep-2005, 15:11

Hi guys,
This is my first post as I am a newbie to c... Pardon the ignorance. I am taking my first prog class and I have this assignment: Make a program that contains five functions for the following problem.

1)read depth of a point inside the earth in a function, get_depth() and return it to main
2)Pass depth to function compute_cel() that computes and returns celsius temp at that point using formula: celsius = 18*depth_in_km+20
3)Write another fcn (compute_fahren()) that accepts celsius temp and computes and returns Fahrenheit temp to main. Formula for converting c to f = 1.8*celsius+32
4)Print all three items in a function called print_info(). Remember you have to pass all variable to this function before you can print them.
5)Write top_of_info() function - im fine with this one.

Here is what I have, and im just stuck... can anyone point me in a direction where I can at least begin to correct this thing? Thank you so much!
Chris

CPP / C++ / C Code:

#include <stdio.h>

void top_of_page_info (void);
float get_depth (void);
float compute_cel (get_depth);
float compute_fahren (compute_cel);
float print_info (float depth_in_km, float celsius, float fahrenheit);


int main (void)
{   
    float depth_in_km;
    float celsius;
    float fahrenheit;
    
    printf("Enter depth(in km) of a point inside the earth:");
    scanf("%f", &depth_in_km);
    printf("The depth of a point inside the earth is:%f\n", depth_in_km);
    printf("The Celsius temp. at that point is:%f\n", celsius);
    printf("The Fahrenheit temp. at that point is:&f\n", fahrenheit);
    
}    /* end of main program */    


#define NAME "Christopher ******"
#define DASHES "------------------------------------------------------"
void top_of_page_info (void)
{     printf ("%s\n\n", DASHES);
      printf ("\t\tProgrammer Name: %s\n", NAME);
      printf ("\t\tLab No.        : 03\n");
      printf ("\t\tCourse/Section : CSI 147/Section 875\n");
      printf ("\t\tDate Due       : 09/30/2005\n\n");
      printf ("\t\tInstructor     : Dr. Raj Gill, Comp Sci\n");
      printf ("%s\n\n\n", DASHES);
}     
/* ------------------------end top_of_page_info-------------------------------------*/
 
 


float get_depth (void)
{
      float depth_in_km;
      return depth_in_km;
}



float compute_cel (get_depth)
{
      float depth_in_km;
      float celsius;
      celsius = 18 * depth_in_km + 20;
      return celsius;            
}





float compute_fahren (compute_cel)
{
      float celsius;
      float fahrenheit;
      fahrenheit = 1.8 * celsius + 32;
      return fahrenheit;
}



               
float print_info (float depth_in_km, float celsius, float fahrenheit)
{
      return depth_in_km, celsius, fahrenheit;
}

Paramesh · #2 27-Sep-2005, 17:00

hi..
The function declaration should be of this type:

CPP / C++ / C Code:

return-type function-name(parameter list)
{
declarations and statements;
return expression;
}

The return-type specifies the type of data that the function returns. The parameter list is a comma-separated list of variable names and their associated types that receive the values of the arguments when the function is called . All function parameters must be declared individually, each including both the type and name. That is, the parameter declaration list for a function takes this general form:
f(type varname1, type varname2, . . . , type varnameN)

In your function compute_cell, you have not defined the parameter list correctly.
Hence it should be written as:

CPP / C++ / C Code:

float compute_cel (float depth_in_km);

similarly, the function should be written as:

CPP / C++ / C Code:

float compute_fahren (float celsius);

You said:

Quote:

read depth of a point inside the earth in a function, get_depth() and return it to main

You can use scanf inside the get_depth function and return the float value.

CPP / C++ / C Code:

float get_depth(void){
float depth_in_km;
printf("Enter depth(in km) of a point inside the earth:");
scanf("%f", &depth_in_km);
return depth_in_km;
}

and your compute_cel and compute_fahren functions should be changes as:

CPP / C++ / C Code:

float compute_cel (float depth_in_km)
{
float celsius;
celsius = 18 * depth_in_km + 20;
return celsius; 
}

float compute_fahren (float celsius){
float fahrenheit;
fahrenheit = 1.8 * celsius + 32;
return fahrenheit;
}

Do you understand till now?
Now on to the main function.
It should look like:

CPP / C++ / C Code:

int main (){ 
float depth_in_km;
float celsius;
float fahrenheit;

depth_in_km=get_depth();             //get the depth using the function
printf("The depth of a point inside the earth is:%f\n", depth_in_km);
celsius=compute_cel(depth_in_km); //compute the celsius using the function compute_cel
printf("The Celsius temp. at that point is:%f\n", celsius);
fahrenheit=compute_fahren(celsius);//compute the fahrenheit using the function compute_fahren
printf("The Fahrenheit temp. at that point is:&f\n", fahrenheit);

} /* end of main program */

This link describes about using functions in c
Using Functions in C

boousaf · #3 27-Sep-2005, 17:10

Paramesh,
That was MOST helpful, thank you very much!
Chris

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Rate This Thread
Rate This Thread:

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[Include] Doubly-linked List	dsmith	C Programming Language	6	14-Apr-2006 14:12
Noob question on c arrays and functions	brett	C Programming Language	1	20-Apr-2005 04:59
conflict between printf and stdarg.h va functions	mirizar	C Programming Language	3	12-Jul-2004 09:11
Understanding functions	tommy69	C Programming Language	15	15-Mar-2004 18:59

First prog, using functions that pass values...

Re: First prog, using functions that pass values...

Re: First prog, using functions that pass values...