Hi, I'm new to this forum, so hi!
I'm a total beginner and I thought it would help my programming to write a program with a purpose, not just to say "hello world". As I'm good at Maths and have a good understanding of algebra, I thought I'd make a maths toolkit sort of thing...I'm taking it one step at a time, and i'm working on a simple converter for inches and centimetres. I've done the main part of the program (its console based at the moment, I need to learn some more windows programming before I venture there). The problem I have is, when there is a call for input (at the menu for instance, "enter 1 for this" etc.) if any key other than a number is pressed it skips to another part of the program and messes itself up. the only solution I've come up with is to write an If statement as such:
if (x!=1 || x!=2 || x!=3)
{
cout<<"Incorrect data type, please restart the program";
}
I've tried labelling the menu and then pointing it to that after a system("cls") to make it effectively restart, but it just screws itself again. also i can't use the above method of verification when the user is inputting a value for cm or inches. I'm using the Dev-C++ compiler from bloodshed (because its free!). My code is also really messy...I've put quotes at every possible chance...please don't get too angry
, I'm doing my best to tidy it up a bit.
Ok, while writing this I tried to compile my code to check it was ok for posting and i now have 5 errors, saying that "cout" and "cin" etc are undeclared...whats going on? arg! maybe someone can help...
edit: fixed the minor errors with the code i think...still problems with input.
Code:
#include <iostream.h>
#include <stdlib.h>
float convertCmIn(float);
float convertInCm(float);
float main()
{
float cm; // introducing the
float inches; // variables for cm and inches.
float x; // "x" is the users choice of function
menu:
cout<<"\t\tThe Centimetres/Inches conversion program, v0.1.2";
cout<<"\n\n1. Convert Cm to Inches"; //choice 1
cout<<"\n2. Convert Inches to Cm"; //choice 2
cout<<"\n3. Exit"; //choice 3
cout<<"\n\nEnter your choice: "; //users input here
cin>>x;
if (x==1) //checks the users input,i.e. if the user put in "1"
{ //do everything between the 2 brackets
system("cls");
cout<<"Enter a measurement in Centimetres to be converted to Inches: ";
cin>>cm; //the measurement in centimetres
inches = convertCmIn(cm); //calls the function to convert
cout<<"\nHere's the measurement in inches: ";
cout<< inches << endl; //returns the value
cout<< "\n\ncase1" << endl;
system ("pause"); //"press any key to continue" (gives em a chance to view the output)
system("cls"); //this clears the screen
goto menu; //go back to the menu
}
else if (x==2) //see case one
{
system("cls");
cout<<"Enter a measurement in inches to be converted to Centimetres: ";
cin>>inches;
cm = convertInCm(inches);
cout<<"\nHere's the measurement in inches: ";
cout<< cm << endl;
cout<<"\n\ncase2" << endl;
system ("pause");
system("cls");
goto menu;
}
else if (x==3) //again, checking input
return 0; //return nothing, thereby ending the program (i think)
else
{
cout<<"\n\n\tYour input was not valid, please restart the program\n\n";
system("pause");
return 0; //clear the screen.
}
}
float convertCmIn(float cm)
{
float inches;
inches = cm/2.54;
return inches;
}
float convertInCm(float inches)
{
float cm;
cm = inches*2.54;
return cm;
}
//end
Jakeyboy - Annoying Maths Teachers from the comfort of his caravan