Programming Forums > Application Development > C#

Haz · May 7th, 2005, 3:53 PM

When I finally was able to compile my program, and ran it, when I tried to enter some numbers to variables, they already seemed to be assigned to them, with out any of the numbers found in the code. E.g: When I executed the speed, distance, time calculator and executed the speed case; it automatically did 13/10 = 1.3, without me assigning ANY variables at all. What is wrong? What should I do?

Thanks,

Haz

uman · May 7th, 2005, 4:06 PM

Post some code.

Haz · May 7th, 2005, 4:27 PM

This is just an extract of it:

(Toggle Plain Text)

using System;

class Avi {
	public static void Main () {
		char choice;
		char std;
		double speed;
		double distance;
		double time;
		int alt;
		double tempx;
		double x, y, z, a, b, c, d, e, f, g;
		int ac1, ac2;
		double vis;
		double dt, dg, dtg;
		
		for(;;) {
			do {
				
				Console.WriteLine("Choose one from the list:\n");
				Console.WriteLine("1.  Speed; Distance; Time");
				Console.WriteLine("2.  ISA Deviation");
				Console.WriteLine("3.  Time to Impact");
				Console.WriteLine("4.  Track Error; Closing Angle\n");
				Console.Write("Choose one (press Q to quit): ");
				do {
					choice = (char) Console.Read();
				} while(choice == '\n' | choice == '\r');
			} while( choice < '1' | choice > '4' & choice != 'q' );
			
			if(choice == 'q') break;
			
			Console.WriteLine("\n");
			
			switch(choice) {
				case '1':
					do {
						Console.WriteLine("Here you can calculate the Speed, Distance or Time\n");
						Console.WriteLine("Choose which one you want to calculate:");
						Console.WriteLine("1.  Speed");
						Console.WriteLine("2.  Distance");
						Console.WriteLine("3.  Time\n");
						Console.Write("Choose one: ");
						do {
							std = (char) Console.Read();
						} while(std == '\n' | std == '\r');
					} while( std <'1'| std > '3');
					
					Console.WriteLine("\n");
					
					
					switch(std) {
						case '1':
							Console.Write("Distance: ");
							distance = (double) Console.Read();
							Console.Write("Time: ");
							time = (double) Console.Read();
							
							speed = distance / time;
							
							Console.WriteLine("Your Distance was: " + distance);
							Console.WriteLine("Your Time was: " + time);
							
							Console.WriteLine("Thus your Speed is " + speed);
							
							Console.WriteLine("NOTE: Make sure the units are compatible with each other");
							break;
							
						case '2':
							Console.Write("Speed: ");
							speed = (double) Console.Read();
							Console.WriteLine("Time: ");
							time = (double) Console.Read();
							
							distance = speed * time;
							
							Console.WriteLine("Your Speed was: " + speed);
							Console.WriteLine("Your Time was: " + time);
							
							Console.WriteLine("Thus your Distance is: " + distance);
							break;
							
						case '3':
							Console.Write("Speed: ");
							speed = (double) Console.Read();
							Console.WriteLine("Distance: ");
							distance = (double) Console.Read();
							
							time = distance / speed;
							
							Console.WriteLine("Your Speed was: " + speed);
							Console.WriteLine("Your Distance was: " + distance);
							
							Console.WriteLine("Thus your Time is: " + time);
							break;
					}
			        break;

using System;

class Avi {
	public static void Main () {
		char choice;
		char std;
		double speed;
		double distance;
		double time;
		int alt;
		double tempx;
		double x, y, z, a, b, c, d, e, f, g;
		int ac1, ac2;
		double vis;
		double dt, dg, dtg;
		
		for(;;) {
			do {
				
				Console.WriteLine("Choose one from the list:\n");
				Console.WriteLine("1.  Speed; Distance; Time");
				Console.WriteLine("2.  ISA Deviation");
				Console.WriteLine("3.  Time to Impact");
				Console.WriteLine("4.  Track Error; Closing Angle\n");
				Console.Write("Choose one (press Q to quit): ");
				do {
					choice = (char) Console.Read();
				} while(choice == '\n' | choice == '\r');
			} while( choice < '1' | choice > '4' & choice != 'q' );
			
			if(choice == 'q') break;
			
			Console.WriteLine("\n");
			
			switch(choice) {
				case '1':
					do {
						Console.WriteLine("Here you can calculate the Speed, Distance or Time\n");
						Console.WriteLine("Choose which one you want to calculate:");
						Console.WriteLine("1.  Speed");
						Console.WriteLine("2.  Distance");
						Console.WriteLine("3.  Time\n");
						Console.Write("Choose one: ");
						do {
							std = (char) Console.Read();
						} while(std == '\n' | std == '\r');
					} while( std <'1'| std > '3');
					
					Console.WriteLine("\n");
					
					
					switch(std) {
						case '1':
							Console.Write("Distance: ");
							distance = (double) Console.Read();
							Console.Write("Time: ");
							time = (double) Console.Read();
							
							speed = distance / time;
							
							Console.WriteLine("Your Distance was: " + distance);
							Console.WriteLine("Your Time was: " + time);
							
							Console.WriteLine("Thus your Speed is " + speed);
							
							Console.WriteLine("NOTE: Make sure the units are compatible with each other");
							break;
							
						case '2':
							Console.Write("Speed: ");
							speed = (double) Console.Read();
							Console.WriteLine("Time: ");
							time = (double) Console.Read();
							
							distance = speed * time;
							
							Console.WriteLine("Your Speed was: " + speed);
							Console.WriteLine("Your Time was: " + time);
							
							Console.WriteLine("Thus your Distance is: " + distance);
							break;
							
						case '3':
							Console.Write("Speed: ");
							speed = (double) Console.Read();
							Console.WriteLine("Distance: ");
							distance = (double) Console.Read();
							
							time = distance / speed;
							
							Console.WriteLine("Your Speed was: " + speed);
							Console.WriteLine("Your Distance was: " + distance);
							
							Console.WriteLine("Thus your Time is: " + time);
							break;
					}
			        break;

Ooble · May 7th, 2005, 8:27 PM

When you declare a variable and assign it some space, it doesn't clear out or zero whatever's in that space - it just leaves it there. Therefore, I strongly advise you to allocate variables upon declaration.

Dameon · May 8th, 2005, 11:55 AM

Ooble, I knew that was the case in C/C++ but I had no idea C# didn't default to 0 on numeric variables like the other .Net languages.

Ooble · May 8th, 2005, 12:49 PM

Well, VB's always set variables to 0 or Empty upon declaration. I don't know about the others.

Haz · May 8th, 2005, 1:46 PM

Sorry but I'm REALLY confused at what I'm suppose to do here

.

Ooble · May 8th, 2005, 3:37 PM

Simple:

(Toggle Plain Text)

char blah = '\0';
int foo = 0;
double me = 0;
string hello = "";

Basically, allocate things to the variables before you use them.

Haz · May 8th, 2005, 5:11 PM

Ahhhh I see now thanks

Haz · May 8th, 2005, 5:19 PM

Sorry, doesn't work, this is the code for the variable allocation:

(Toggle Plain Text)

char choice = '\0';
		char std = '\0';
		double speed = 0;
		double distance = 0;
		double time = 0;
		int alt = 0;
		double tempx = 0;
		double x = 0, y = 0, z = 0, a = 0, b = 0, c = 0, d = 0, e = 0, f = 0, g = 0;
		int ac1 = 0, ac2 = 0;
		double vis = 0;
		double dt = 0, dg = 0, dtg = 0;

May 7th, 2005, 3:53 PM	#1
Haz Programmer Join Date: Feb 2005 Location: England Posts: 37 Rep Power: 0	Assignment of numbers to variables without asking When I finally was able to compile my program, and ran it, when I tried to enter some numbers to variables, they already seemed to be assigned to them, with out any of the numbers found in the code. E.g: When I executed the speed, distance, time calculator and executed the speed case; it automatically did 13/10 = 1.3, without me assigning ANY variables at all. What is wrong? What should I do? Thanks, Haz

May 7th, 2005, 8:27 PM	#4
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	When you declare a variable and assign it some space, it doesn't clear out or zero whatever's in that space - it just leaves it there. Therefore, I strongly advise you to allocate variables upon declaration. __________________ Me :: You :: Them

May 8th, 2005, 12:49 PM	#6
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	Well, VB's always set variables to 0 or Empty upon declaration. I don't know about the others. __________________ Me :: You :: Them

May 8th, 2005, 3:37 PM	#8
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	Simple: (Toggle Plain Text) char blah = '\0'; int foo = 0; double me = 0; string hello = ""; char blah = '\0'; int foo = 0; double me = 0; string hello = ""; Basically, allocate things to the variables before you use them. __________________ Me :: You :: Them

May 8th, 2005, 5:19 PM	#10
Haz Programmer Join Date: Feb 2005 Location: England Posts: 37 Rep Power: 0	Sorry, doesn't work, this is the code for the variable allocation: (Toggle Plain Text) char choice = '\0'; char std = '\0'; double speed = 0; double distance = 0; double time = 0; int alt = 0; double tempx = 0; double x = 0, y = 0, z = 0, a = 0, b = 0, c = 0, d = 0, e = 0, f = 0, g = 0; int ac1 = 0, ac2 = 0; double vis = 0; double dt = 0, dg = 0, dtg = 0; char choice = '\0'; char std = '\0'; double speed = 0; double distance = 0; double time = 0; int alt = 0; double tempx = 0; double x = 0, y = 0, z = 0, a = 0, b = 0, c = 0, d = 0, e = 0, f = 0, g = 0; int ac1 = 0, ac2 = 0; double vis = 0; double dt = 0, dg = 0, dtg = 0;

May 7th, 2005, 4:06 PM	#2
uman Expert Programmer Join Date: Dec 2004 Posts: 794 Rep Power: 4	Post some code.

May 7th, 2005, 4:27 PM	#3
Haz Programmer Join Date: Feb 2005 Location: England Posts: 37 Rep Power: 0	This is just an extract of it: (Toggle Plain Text) using System; class Avi { public static void Main () { char choice; char std; double speed; double distance; double time; int alt; double tempx; double x, y, z, a, b, c, d, e, f, g; int ac1, ac2; double vis; double dt, dg, dtg; for(;;) { do { Console.WriteLine("Choose one from the list:\n"); Console.WriteLine("1. Speed; Distance; Time"); Console.WriteLine("2. ISA Deviation"); Console.WriteLine("3. Time to Impact"); Console.WriteLine("4. Track Error; Closing Angle\n"); Console.Write("Choose one (press Q to quit): "); do { choice = (char) Console.Read(); } while(choice == '\n' \| choice == '\r'); } while( choice < '1' \| choice > '4' & choice != 'q' ); if(choice == 'q') break; Console.WriteLine("\n"); switch(choice) { case '1': do { Console.WriteLine("Here you can calculate the Speed, Distance or Time\n"); Console.WriteLine("Choose which one you want to calculate:"); Console.WriteLine("1. Speed"); Console.WriteLine("2. Distance"); Console.WriteLine("3. Time\n"); Console.Write("Choose one: "); do { std = (char) Console.Read(); } while(std == '\n' \| std == '\r'); } while( std <'1'\| std > '3'); Console.WriteLine("\n"); switch(std) { case '1': Console.Write("Distance: "); distance = (double) Console.Read(); Console.Write("Time: "); time = (double) Console.Read(); speed = distance / time; Console.WriteLine("Your Distance was: " + distance); Console.WriteLine("Your Time was: " + time); Console.WriteLine("Thus your Speed is " + speed); Console.WriteLine("NOTE: Make sure the units are compatible with each other"); break; case '2': Console.Write("Speed: "); speed = (double) Console.Read(); Console.WriteLine("Time: "); time = (double) Console.Read(); distance = speed * time; Console.WriteLine("Your Speed was: " + speed); Console.WriteLine("Your Time was: " + time); Console.WriteLine("Thus your Distance is: " + distance); break; case '3': Console.Write("Speed: "); speed = (double) Console.Read(); Console.WriteLine("Distance: "); distance = (double) Console.Read(); time = distance / speed; Console.WriteLine("Your Speed was: " + speed); Console.WriteLine("Your Distance was: " + distance); Console.WriteLine("Thus your Time is: " + time); break; } break; using System; class Avi { public static void Main () { char choice; char std; double speed; double distance; double time; int alt; double tempx; double x, y, z, a, b, c, d, e, f, g; int ac1, ac2; double vis; double dt, dg, dtg; for(;;) { do { Console.WriteLine("Choose one from the list:\n"); Console.WriteLine("1. Speed; Distance; Time"); Console.WriteLine("2. ISA Deviation"); Console.WriteLine("3. Time to Impact"); Console.WriteLine("4. Track Error; Closing Angle\n"); Console.Write("Choose one (press Q to quit): "); do { choice = (char) Console.Read(); } while(choice == '\n' \| choice == '\r'); } while( choice < '1' \| choice > '4' & choice != 'q' ); if(choice == 'q') break; Console.WriteLine("\n"); switch(choice) { case '1': do { Console.WriteLine("Here you can calculate the Speed, Distance or Time\n"); Console.WriteLine("Choose which one you want to calculate:"); Console.WriteLine("1. Speed"); Console.WriteLine("2. Distance"); Console.WriteLine("3. Time\n"); Console.Write("Choose one: "); do { std = (char) Console.Read(); } while(std == '\n' \| std == '\r'); } while( std <'1'\| std > '3'); Console.WriteLine("\n"); switch(std) { case '1': Console.Write("Distance: "); distance = (double) Console.Read(); Console.Write("Time: "); time = (double) Console.Read(); speed = distance / time; Console.WriteLine("Your Distance was: " + distance); Console.WriteLine("Your Time was: " + time); Console.WriteLine("Thus your Speed is " + speed); Console.WriteLine("NOTE: Make sure the units are compatible with each other"); break; case '2': Console.Write("Speed: "); speed = (double) Console.Read(); Console.WriteLine("Time: "); time = (double) Console.Read(); distance = speed * time; Console.WriteLine("Your Speed was: " + speed); Console.WriteLine("Your Time was: " + time); Console.WriteLine("Thus your Distance is: " + distance); break; case '3': Console.Write("Speed: "); speed = (double) Console.Read(); Console.WriteLine("Distance: "); distance = (double) Console.Read(); time = distance / speed; Console.WriteLine("Your Speed was: " + speed); Console.WriteLine("Your Distance was: " + distance); Console.WriteLine("Thus your Time is: " + time); break; } break;

May 8th, 2005, 11:55 AM	#5
Dameon Troll Join Date: Apr 2005 Location: Texas Posts: 732 Rep Power: 4	Ooble, I knew that was the case in C/C++ but I had no idea C# didn't default to 0 on numeric variables like the other .Net languages.

May 8th, 2005, 1:46 PM	#7
Haz Programmer Join Date: Feb 2005 Location: England Posts: 37 Rep Power: 0	Sorry but I'm REALLY confused at what I'm suppose to do here .

May 8th, 2005, 5:11 PM	#9
Haz Programmer Join Date: Feb 2005 Location: England Posts: 37 Rep Power: 0	Ahhhh I see now thanks

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Programming Forums > Application Development > C#

Assignment of numbers to variables without asking