Thread: Multiplication program

Of course we can help. Why don't you start reading here and then perhaps take a look at the the homework policy and then you could even read up on how to ask questions. That should provide you with all the help you need. Oh and to help you going with getting a program to run:

Code:

int main(void)
{
     return(0);
}

That runs fine for me.

Regardless, you still need to post your actual effort to date, so we can best guide you though the next step, and correct whatever mis-understandings you may have so far.

Originally Posted by http://www.cprogramming.com/tutorial/c/lesson3.html

WHILE - WHILE loops are very simple. The basic structure is

Code:

 while ( condition ) { Code to execute while the condition is true }

The true represents a boolean expression which could be x == 1 or while ( x != 7 ) (x does not equal 7). It can be any combination of boolean statements that are legal. Even, (while x ==5 || v == 7) which says execute the code while x equals five or while v equals 7. Notice that a while loop is like a stripped-down version of a for loop-- it has no initialization or update section.

So to rework your the first part of your code:

Code:

int main(void)
{

	int i, j;
	i = 1;
	j = 1;


	printf("   |");
	
	//for (i = 1; i < 13; ++i)
	while (i < 13)
	{
		printf("%3d   ", i);
		++i;
	}
	printf("\n");
///rest of program

Additionally, since you had already initialized i, you could have rewritten your for loop like:

Code:

for (i; i < 13; ++i)

However, since it is often best practice to declare variables with the most limited scope possible, let's rewrite your initial program:

Code:

#include <stdio.h>

int main(void)
{
	
	printf("   |");
	
	for (int i = 1; i < 13; ++i)
	{
		printf("%3d   ", i);
		
	}
	printf("\n");


	for (int i = 1; i < 75; ++i)
	{
		printf("-");
	}
	printf("\n");


	for (int i = 1; i < 13; ++i)
	{
		printf("%2d |", i);
		for (int j = 1; j < 13; ++j)
		{
			printf("%3d   ", i * j);
		}
		printf("\n");
	}

	return 0;
}

Code:

for ( init ; condition ; step ) {
	  body;
	}

is logically equivalent to this (excepting the action of the continue keyword)

Code:

	init;
	while( condition ) {
	  body;
	  step;
	}