Multiplication Via Addition

htdefiant

Sep 23 2007, 06:45 PM

I'm looking for some brainstorming help. The task is to create a program where the user enters two integers, and have them multiply without using the multiplication function. For example, if the user enters 5 and 10, the program is supposed to go 10+10+10+10+10, not 5*10. I have gotten as far getting input from the user. I am thinking of using a while loop for this. Does anyone have suggestions as to the best way to do this with the while statement? Thanks.

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galexcd

Sep 23 2007, 07:25 PM

I think a for loop would be easier:

CODE

int total=0;
for(int i=0;i<firstnumber;i++) total+=secondnumber;

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htdefiant

Sep 23 2007, 07:34 PM

I am not familiar with or loops. Perhaps you could describe the best method to use with a while loop?

Thanks for your help.

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galexcd

Sep 23 2007, 08:25 PM

Sure it just takes a little bit more code for the same results:

CODE

int total=0;
int i=0;
while(i<firstnumber){
total+=secondnumber;
i++;
}

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htdefiant

Sep 23 2007, 08:38 PM

Sorry to keep perpetuating this - you've been very helpful - what is that programming in C, not C++?

Thanks for you help,
A fellow OS X geek

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galexcd

Sep 23 2007, 08:49 PM

It actually should work in both c and c++, and even java if you declare those variables inside a method. Most programming languages have extremely similar syntax.

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htdefiant

Sep 23 2007, 10:27 PM

Sorry Alex - I am very new at this. Here is what I have:

CODE

main ()

{
     int num1, num2, num3;
     printf("Please an integer:\n");
     num1=GetInteger();
     printf("Please a second integer:\n");
     num2=GetInteger();
     while (num2>1)
     {
           }
     getchar ();
     return 0;
     }

How do I apply the code you gave me to this base?

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galexcd

Sep 24 2007, 02:45 AM

try this... num3 is the result of num1 times num2

CODE

int num1, num2, num3=0;
     printf("Please an integer:\n");
     num1=GetInteger();
     printf("Please a second integer:\n");
     num2=GetInteger();
     int i=0;
     while(i<num1){
          num3+=num2;
          i++;
     }
     getchar ();
     return 0;
     }

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htdefiant

Sep 24 2007, 06:02 PM

Thanks

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galexcd

Sep 24 2007, 08:00 PM

QUOTE(htdefiant @ Sep 24 2007, 11:02 AM)

Thanks

Everything works how it should? No more problems? If so great and good luck with the rest of the project.

Feel free to PM me with any questions you still may have!

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