[vamperes]

I have to create a program that does 2 things. 1. it convers any decimal to a 32 bit binary and 2. do fibonacci sequence with any inputed numbers. I have figured out the fibonacci sequence but I cant seem to get the binary conversion. Im stuck on getting the correct BITTEST number. I currently have it equal to 2147483647 in my convert function, even though i know its wrong. Can anyone please help me with this?

#include <stdio.h>
#include <string.h>
#include <math.h>

/*this function convers decimals to binary*/
int convert (int decimal)
{
	int remain, result, bittest = 2147483647;
	int counter1 =0;
	
	for (counter1=0; counter1<32; counter1++)
	{
		/*if num is greater or equal to bittest then 1*/
		if(decimal>=bittest) 
		{
			printf("1");
			decimal=decimal-bittest;
		}
		else
			/*if num is less then bittest then 0*/
			printf("0");
		bittest=bittest/2;
		/*prints space after every 8th number*/
		if (counter1 == 7 || counter1 == 15 || counter1 == 23)
		printf(" ");
	}
	printf("\n");
	counter1=0;
}

/*check that the input is between 0 and 2147483647*/
int input_check (int correct)
{
	while (correct < 0 || correct > 2147483648)
	{
		printf("\nWrong entry. Number must be between 0 and 2147483647");
		scanf("%d", &correct);
	}
}

/*this function calculates the fibonacci sequence*/
int fibonacci (int num1, int num2)
{
	int sum, counter2;
	sum, counter2 =0;

	while (counter2 < 8)
	{
		sum=num1+num2;
		/*prints the last number without coma*/
		if (counter2 == 7)
			printf("%d", sum);
		else
			printf("%d,", sum);
		num1=num2;
		num2=sum;
		counter2++;
	}
}

/*this function calculates the 30th fibonacci number and return the value to main*/
int fibonacci30 (int num1, int num2)
{
	int sum, counter2;
	sum, counter2 =0;

	while (counter2 < 29)
	{
		sum=num1+num2;
		num1=num2;
		num2=sum;
		counter2++;
	}
	return sum;

}	

/*main program*/
main()
{

	int selection, binary, fib1, fib2;

	printf("\nWelcome to the Math Function Menu");
	printf("\n1.) Integer to Binary converter");
	printf("\n2.) Fibonacci generator");
	printf("\n999.) Exit");
	printf("\nEnter selection ---> ");
	scanf("%d", &selection);
	printf("\n");

	while (selection != 999)
	{
		/*if selection is wrong it will prompt for it again*/
		while (selection != 1 && selection != 2 && selection != 999)
		{
			printf("\nWrong selection. Enter 1, 2 or 999 to Exit: ");
			scanf("%d", &selection);
		}

		switch(selection)
		{		
			/*case 1 will be integer to binary conversion*/
			case 1:	
				printf("\nEnter a number between 0 and 2147483647 inclusive: ");
				scanf("%d", &binary);
				
				/*calls a function that checks corrent input in case 1*/
				input_check(binary);
								
				/*calling a function convert that converts decimals to binary*/
				convert(binary);	
					
				break;
		
			case 2:
				printf("Enter first number: ");
				scanf("%d", &fib1);
				printf("Enter second number: ");
				scanf("%d", &fib2);
			
				/*while first number is greater then second number this loop will run*/
				while (fib1 > fib2)
				{
					printf(" Second number must be greater then first number.\n");
					printf("Enter first number: ");
					scanf("%d", &fib1);
					printf("Enter second number: ");
					scanf("%d", &fib2);
				}
				
				printf("%d,", fib1);
				printf("%d,", fib2);
				
				/*call function to calculate the finonacci sequence*/
				fibonacci(fib1, fib2);
				printf("Fib [30, {%d,%d}] = %d", fib1, fib2, fibonacci30(fib1, fib2));
				
				break;

			default:
				printf("\nDefaul in the case\n");
				break;

		}
		printf("\nWelcome to the Math Function Menu");
		printf("\n1.) Integer to Binary converter");
		printf("\n2.) Fibonacci generator");
		printf("\n999.) Exit");
		printf("\nEnter selection ---> ");
		scanf("%d", &selection);
		printf("\n");
	}	
}

[jpw1991]

Try these links:
http://www.codeguru....ad.php?t=323835
http://www.openasthr...mming/ieee-754/
http://forums.devshe...7896#post707896
http://www.dreaminco...h...8&hl=binary

Hope this helps

[vamperes]

Thank you very much jpw1991! You were absolutely right. I was using variable bittest as an int instead of a double. I got it working.