C Program - Creating a table with squared and cubed results from user inputs

I am supposed to write a C program with a function selectTable that accepts values for numbers, tablesize, and increment in which the numbers increase by and produce a table with those inputs. What am I doing wrong?

Code:

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#include<stdio.h>
#include<stdlib.h>
#pragmawarning (disable:4996)
int main()
{
  void selectTable(float, float, float);
  float tablesize, numbers, increment;
  printf("Ener the table size: ");
  scanf("%f", &tablesize);
  printf("Enter the number to begin with: ");
  scanf("%f", &numbers);
  printf("Enter the increment the numbers will increase by: ");
  scanf("%f", &increment);
  selectTable(numbers, tablesize, increment);
  system("pause");
  return 0;
}

void selectTable(float numbers, float tablesize, float increment)
{
  int i;
  printf("NUMBER SQUARE CUBE \n");
  printf("------ ------ ---- \n");
  　i = 0;
  for (numbers; numbers += increment;)
    for (i = numbers; i <= (numbers + (tablesize - 1) * increment);
        i += increment);
  printf("%f %f %f\n", numbers, numbers * numbers,
        numbers * numbers * numbers);
}

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Remove the ; at the end of line 27
You have loops which do nothing,

I removed the ; on 27 my solution doesn't end. How do I correct the loop I wrote?

Well you could fix one of your for loops to actually have an exit condition.

Lol, well the loop is the one thing the instructor gave me. I am just beginning in C, how would I write an exit condition.

Quote:

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Originally Posted by LearnOnTheFly

I am just beginning in C, how would I write an exit condition.

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Compare the one without a proper exit condition:

Code:

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for (numbers; numbers += increment;)

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with one that does:

Code:

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for (i = numbers; i <= (numbers + (tablesize - 1) * increment); i += increment);

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Basically, numbers += increment became your exit condition, and unless numbers ever evaluates to 0 (false), you have an infinite loop.

I removed the invalid loop. When I run my solution. I get the correct table size and starting number but my numbers dont increase in increment

The solutions displays with the iputs tablesize = 4 starting number = 2 and increment = 3

2 4 8
2 4 8
2 4 8
2 4 8

What is your current code, and how does it not work?

Code:

---

#include<stdio.h>
#include<stdlib.h>
#pragmawarning (disable:4996)
int main ()
{
void selectTable(float, float, float);
float tablesize, numbers, increment;
printf("Ener the table size: ");
scanf("%f", &tablesize);
printf("Enter the number to begin with: ");
scanf("%f", &numbers);
printf("Enter the increment the numbers will increase by: ");
scanf("%f", &increment);
selectTable(numbers, tablesize, increment);
system("pause");
return 0;
}
void selectTable(float numbers, float tablesize, float increment)
{
int i;
printf("NUMBER SQUARE CUBE \n");
printf("------ ------ ---- \n");
　
i = 0;
for (i = numbers; i <= (numbers + (tablesize -1) * increment); i += increment)
printf("%f %f %f\n", numbers, numbers*numbers, numbers*numbers*numbers);
}


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The tablesize and starting number is correct but instead of the next number increasing by the incremnt amount it just repeats the starting value until the tablesize is satisfied.

That's because you're not printing a number that changes within the loop. I think you mean to do

Code:

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      printf("%f %f %f\n", i, i*i, i*i*i);

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although even this will have a few issues when you try to compile it.

Thanks! I also had to change %f to %d, I am assuming becuase i was an int

That's right. You could also change "i" to a float. That might actually be better, because you're prompting the user for floats.