Binary To Decimal in C

Posted on October 18, 2011August 21, 2017 by Sandeepa Nadahalli

C Program to convert a binary number into its equivalent Decimal. In binary number system or base-2 system numeric valuer are represented by using two different symbols 0 and 1. The binary number system is a positional notation with a radix of 2.

This program converts a given base-2 number to it’s decimal equivalent (or base-10 representation).

The Program

	#include<stdio.h>

	/*
	* Function to convert a given binary number to
	* its decimal equivalent.
	*/
	int binary_to_decimal(int num) {
	int rem, base = 1, decimal_number = 0;
	while( num > 0) {
	rem = num % 10;
	if((rem == 0) \|\| (rem == 1)) {
	decimal_number = decimal_number + rem * base;
	num = num / 10 ;
	base = base * 2;
	} else {
	return -1; // Invalid binary number
	}
	}
	return decimal_number;
	}

	int main() {
	long int binary_number, decimal_number;
	printf("Enter any binary number : ");

	scanf("%ld", &binary_number);

	decimal_number = binary_to_decimal(binary_number);

	if(decimal_number != -1) {
	printf("The decimal equivalent value of binary %ld is: %ld",
	binary_number, decimal_number);
	} else {
	printf("\nPlease enter a valid binary number!");
	}
	return 0;
	}

view raw binary_to_decimal.c hosted with ❤ by GitHub

Sample Output

Binary To Decimal

Related Programs

Edit1: 21st August 2017

Added links to related programs
Added a screenshot of sample output
Moved program to it’s own gist.

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C Program to count number of characters in the file

Posted on October 18, 2011 by Sandeepa Nadahalli

C Program to count number of characters in the file. In this program you can learn c file operations. Here we counting the characters by reading the characters in the file one by one and if read character was not an ‘n’ ,’t’ or EOF, it increments the counter by one. Read more about C Programming Language .

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/

#include<stdio.h>
#include<conio.h>

void main()
{
 char ch;
 int count=0;
 FILE *fptr;
 clrscr();
 fptr=fopen("text.txt","w");
 if(fptr==NULL)
 {
  printf("File can't be createda");
  getch();
  exit(0);
 }
 printf("Enter some text and press enter key:n");
 while((ch=getche())!='r')
 {
  fputc(ch,fptr);
 }
 fclose(fptr);
 fptr=fopen("text.txt","r");
 printf("nContents of the File is:");
 while((ch=fgetc(fptr))!=EOF)
 {
  count++;
  printf("%c",ch);
 }
 fclose(fptr);
 printf("nThe number of characters present in file is: %d",count);
 getch();
}

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C Program to find GCD and LCM using Recursion

Posted on October 18, 2011 by Sandeepa Nadahalli

C Program to find the GCD and LCM. In this program we used the Recursion method. Recursion is the programming technique that a process invoking itself again and again. Here find_gcd() and find_(lcm) are the recursive methods. for example LCM and GCD of 8,12 is 24 and 4 Read more about C Programming Language .

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
*  
*                      Happy Coding
***********************************************************/

/* 
* http://www.c-program-example.com/2011/10/c-program-to-find-gcd-and-lcm-using.html
*/ 

/* Find this on GitHub: 
*  https://github.com/snadahalli/cprograms/blob/master/gcd_lcm_rec.c
*/

#include "stdio.h"
int find_gcd(int,int);
int find_lcm(int,int);
int main(){
 int num1,num2,gcd,lcm;
 printf("nEnter two numbers:n ");
 scanf("%d %d",&num1,&num2);
 gcd=find_gcd(num1,num2);
 
 printf("nnGCD of %d and %d is: %dnn",num1,num2,gcd);
 
 if(num1>num2)
  lcm = find_lcm(num1,num2);
 else
  lcm = find_lcm(num2,num1);
 
 printf("nnLCM of %d and %d is: %dnn",num1,num2,lcm);
 return 0;
}
 
int find_gcd(int n1,int n2){
 while(n1!=n2){
  if(n1>n2)
   return find_gcd(n1-n2,n2);
  else
   return find_gcd(n1,n2-n1);
 }
 return n1;
}

int find_lcm(int n1,int n2){
 
 static int temp = 1;
 
 if(temp % n2 == 0 && temp % n1 == 0)
  return temp;
 temp++;
 find_lcm(n1,n2);
 
 return temp;
}

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C program to print Fibonacci numbers using Recursion

Posted on October 18, 2011 by Sandeepa Nadahalli

C Program to print Fibonacci numbers. In this program we used the Recursion method. Recursion is the programming technique that a process invoking itself again and again. Fibonacci numbers are sequence of numbers starts from 0 and 1 , continue by adding previous number. 0,1,1,2,3,5,8,13,…….. Read more about C Programming Language .

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/

#include<stdio.h> 
#include<conio.h> 
int fib(int); 
int f=1,fib1=0,fib2=0,i=0,j; 
void main() 
{ 
 int num; 
 clrscr(); 
 printf(" How many Fibonacci numbers do you want?n"); 
 scanf("%d",&num); 
 printf("nFibonacci Numbers are:n");
 f=0; 
 printf("n%dn",f); 
 f=1; 
 printf("n%dn",f); 
 for(j=0;j<num-2;j++) 
 { 
  f=fib(num); 
  printf("n%dn",f); 
 } 
 getch(); 
} 
int fib(int n) 
{ 

 while(i<n) 
 { 
  if(i<=n) 
  { 
   i++; 
   fib1=fib2; 
   fib2=f; 
   f=fib2+fib1; 
   fib(1); 
   return f; 
  } 
 } 

}

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C Program to calculate factorial using Recursive function

Posted on October 18, 2011 by Sandeepa Nadahalli

C Program to find the factorial of a number. In this program we used the Recursion method. Recursion is the programming technique that a process invoking itself again and again. The standard recursive function for factorial is factorial=n*fact(n-1). factorial of number denoted by ‘!’, means product of all non negative integers from 1 to number. example: 5!=5*4*3*2*1=120. Read more about C Programming Language .

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/

#include<stdio.h>
int factorial(int);

void main()
{
 int num;
 printf("Enter the number to calculate Factorial :");
 scanf("%d",&num);
 printf("nFactorial : %d", factorial (num));

}
int factorial (int i)
{
 int f;
 if(i==1)
  return 1;
 else
  f = i* factorial (i-1);
 return f;
}

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Array search program in C

Posted on October 18, 2011August 6, 2017 by Sandeepa Nadahalli

Very often we encounter a situation where we have to search for a given target value in a list of values. Simple value types like integers are stored in arrays. This program demonstrates how to do a search within an array by using a method called linear search.

Linear search, also called as ‘Sequential search’ is a technique of finding a target value within a list. It sequentially checks each element of the list with target value until a match is found or the list is exhausted. This approach may be very inefficient to be used in practical problem solving. However, this is very easy to understand and implement. You can read more about linear search.

This program implements linear search to search for a given integer key in an integer array. We have many more C programs that deal with arrays. See more Programs on Arrays in C.

The Program

	#include <stdio.h>
	#include <conio.h>

	void main()
	{
	int array[10];
	int i, N, keynum, found=0;

	printf("Enter the value of N\n");
	scanf("%d",&N);

	printf("Enter the elements one by one\n");
	for(i=0; i<N ; i++)
	{
	scanf("%d",&array[i]);
	}
	printf("Input array is\n");
	for(i=0; i<N ; i++)
	{
	printf("%d\n",array[i]);
	}
	printf("Enter the element to be searched\n");
	scanf("%d", &keynum);


	for ( i=0; i < N ; i++)
	{
	if( keynum == array[i] )
	{
	found = 1;
	break;
	}
	}
	if ( found == 1)
	printf("Element found in the given array");
	else
	printf("Element was not found in the array");

	} /* End of main */

view raw Linear_array_search.c hosted with ❤ by GitHub

Sample Output

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C Program to demonstrate the ‘fgets’ function.

Posted on October 17, 2011 by Sandeepa Nadahalli

Program to demonstrate the ‘fgets’ function. The program will count the number of lines in a file. This is a function of the UNIX command ‘wc’. Read more about C Programming Language .

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/



#include <stdio.h>

#define LINE_LENGTH 80

main()
{
 FILE* fp;
 char line[LINE_LENGTH];
 int count=0;

 fp=fopen("/home/DOC/C/c.html","r");
 /* Count up the lines here. */
 while ( fgets(line, LINE_LENGTH, fp) != NULL) count++;

 printf("File contains %d lines.n", count);

 fclose(fp);
}

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C Program to calculate the Combinations and Permutations.

Posted on October 14, 2011 by Sandeepa Nadahalli

C Program to calculate the Combination and Permutations. Combination means way of selecting a things or particular item from the group or sets. nCr=n!/r!(n-r)!. Permutations means possible way of rearranging in the group or set in the particular order. Read more about C Programming Language .

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/

#include <stdio.h>
#include <conio.h>

main()
{
 int n , r, ncr( int , int);
 long npr( int , int);
 long double fact( int);
 printf(" Enter value of n & r n");
 scanf("%d %d",&n , &r);
 if( n>= r)
 {
  printf( " %dC%d is %dn", n,r,ncr( n , r));
  printf(" %dP%d  is %ld", n,r,npr( n, r));
 }
 else
 {
  printf("WRONG INPUT?? enter the correct input");
 }
}
long double fact( int p)
{
 long double facts = 1;
 int i;
 for( i = 1; i<= p; i++)
  facts = facts * i;
 return( facts);
}

int ncr ( int n, int r)
{
 return( fact( n) / (fact( r) * fact(n- r) ) ) ;
}

long npr( int n , int r)
{
 return( fact( n) / fact( n- r));
}

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C Program to check the given number is Armstrong or not?

Posted on October 14, 2011 by Sandeepa Nadahalli

C Program to check the given number is Armstrong number or not?. Armstrong number is a number that is the sum of its own digits each raised to the power of the number of digits. Example: 153 = 1^3 + 5^3 + 3^3. Read more about C Programming Language .

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/


#include<stdio.h>
void main()
{
 int num,num1,arms=0,rem;

 printf("Enter the number:n");
 scanf("%d",&num);
 num1=num;
 while(num>0)
 {
  rem=num%10;
  arms=arms+rem*rem*rem;
  num=num/10;
 }
 if(num1==arms)
 {
  printf(" n%d is an Armstrong number",num1);
 }
 else
 {
  printf("n%d is NOT an Armstrong number",num1);
 }

}

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C Program to Demonstrate #if, #else & #endif preprocessors.

Posted on October 14, 2011 by Sandeepa Nadahalli

C Program to demonstrate the Preprocessor directives like #if, #else, #define, #endif. C Preprocessors are not the program statements, they are executed before the actual compilation of the code. C Preprocessors substitute the code where they called, i.e they replace the code as they defined. #if, #else are the conditional directives. Here at the compile time #if value is false, so #else part is execute.
Read more about C Programming Language .

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/

#include<stdio.h>

#define SWITCH 0

/* The #if can only perform 
 * INTEGER tests!!!!
 */
#if  ( SWITCH == 1 )
#define TEXT "Example to #if"
#else
#define TEXT "Example to # else"
#endif

main ()
{
 printf(TEXT);
}

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