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Hello great programmers out there!
I am new to C programming and I am just wondering how to multiply / divide two different variables which the user type in as the promt is asking like this:
When you've enterd the two numbers I need to eather multiply or divide the two variables "a" & "b"Code:void inmatning3 (double *a, double *b) {
printf("Mata in tv\217 stycken flyttal: "); /* asks you to type in 2 numbers */
scanf("%lf %lf", a, b);
}
Thanks for the help!
Do you want to give the option to the user to multiply or divide the numbers? If so, there are some ways to do so:
*) Give a list of options and let the user choose the desired one
*) Make it possible to type for example "1.2 / 3.4" ( By reading a number, a non-blank character, and a number again )
Yeah, exaclty! But they won't be able to divide it straight away...Quote:
Originally Posted by GReaper
1) They first have to type in the two variables
2) Secound they will choose eather if they want to divide or multiply, like so:
Here I am confused and don't know what to do, I am in need of how to do... I want to be able to multiply when I type in "Produkt" and when I type in "Kvot" or anything but "Produkt" to be able to divide...Code:void PellerK(double *Produkt, double *Kvot){
printf("Produkt eller Kvot?\n"); /* Here it asks for eather to Multiply or Divide */
scanf("%lf %lf",Produkt,Kvot);
if (PellerK == Produkt) { /* Multiply */
printf("Produkten blir = %d\n");
}
else { /* Divide */
printf("Kvoten blir = %d\n"); }
Try to convert this pseudocode into a program. The code below doesn't do anything similar to that.Quote:
Originally Posted by Cofex
I guess your two parameters should be the numbers you want to multiply/divide. Then the variable names are misleading and the parameters should be called like "number1" and "number2". And I don't think you need them to be pointers but return the actual result from the calculation.Code:void PellerK(double *Produkt, double *Kvot){
You ask the user whether s/he wants to multiply or divide and expect two doubles as input? If I see a question like that I would input "*" or "/" or perhaps "multiply" or "divide" but I would never try to input the actual numbers for the calculation.Code:printf("Produkt eller Kvot?\n"); /* Here it asks for eather to Multiply or Divide */
scanf("%lf %lf",Produkt,Kvot);
"PellerK" is a function and in this expression it's a pointer to the function. So that's completely wrong.Code:if (PellerK == Produkt) { /* Multiply */
printf("Produkten blir = %d\n");
And if you use "%d" you also need to provide the value to print.
You need to think about the whole process step by step and write each step down. Then you need to translate this pseudocode into valid C code.
If you don't have a clear plan for your program you won't be able to finish it.
For example you could start with a list like
and only after you have written down every single step you turn on the computer and write the C code for it.Code:1) Ask user for first number
2) Read input from user and store value in variable "number1"
3) Ask user for second number
...
Bye, Andreas
Wow, thanks Andreas for the great respond!
Produkt means multiply & Kvot means divide. I have allready passed the part when I am going to enter the two numbers.Quote:
Originally Posted by AndiPersti
Do you got Skype by any chance ? - I would be really greatfull if I could talk & ask questions to a good C Programmer...Code:void inmatning(double *, double *);
int main(int argc, char *argv[])
{
double nummer1 = 1, nummer2 = 2;
inmatning(&nummer1,&nummer2);
printf("%f %f\n",nummer1,nummer2);
void inmatning(double *nummer1, double *nummer2)
{
printf("Mata in tv\217 stycken flyttal: ");
scanf("%lf %lf", nummer1, nummer2);
}
Ok, but that doesn't change the fact that you shouldn't name the parameters like that. Think about what you want to pass to the function: two numbers, right?Quote:
Originally Posted by Cofex
Do you have already a plan how you want to continue, i.e. the pseudocode you want to implement? Don't write any line of real code as long as you don't have a plan.
No, I don't have Skype. Ask here and you will probably get an answer (either from me or someone else).Quote:
Do you got Skype by any chance ? - I would be really greatfull if I could talk & ask questions to a good C Programmer...
Bye, Andreas