 #include <stdio.h>
#include<math.h>
#define BITWIDTH 32
//Declaring Variables
	int numbers[BITWIDTH];
	int hexanumbers[BITWIDTH/4];
//Display Function
int Display(int count,int numbers[])
{
  int j=0;
	for(j=(BITWIDTH)-count;j<(BITWIDTH);j++)
	{
		printf("%d",numbers[j]);
	}
	return 0;
}
//Input Function
int Input()
{ 
  int no=0;
  printf("Enter a No.\n");
	scanf("%d",&no);
  return no;
}
//Function to convert decimal to binary
int BinaryConvert(int num,int output[],int digit)
{
  int i=0;
  for(i=(BITWIDTH-1);i>=0;i--)
	{
		if(num>0)
		{
			int remainder = num%2;
			output[i]=remainder;
			num=num/2;
			digit++;
		}
		else
		{
			output[i]=0;
		}

	}
  return digit;
}
//Calculating 1s Complement
int OnesComplement(int dig)
{
  int k=0;
  for(k=(BITWIDTH)-dig;k<(BITWIDTH);k++)
	{
	  if(numbers[k]==0)
	  {
	    numbers[k]=1;
	  }
	  else
	  {
	    numbers[k]=0;
	  }
	}
  return 0;
}
//Calculating 2s Complement
int TwosComplement(int digi)
{
  int l=0;
  numbers[(BITWIDTH-1)]=numbers[(BITWIDTH-1)]+1;
	for(l=(BITWIDTH-1);l>=(BITWIDTH)-(digi);l--)
	{
	  if(numbers[l]==1)
	  {
	    break;
	  }
	  else
	  {
	    numbers[l]=0;
	    numbers[l-1]++;
	  }
	  
	}
  return 0;
}
//Converting to Hexadecimal
int Hexa(int arr[])
{
  int index=BITWIDTH-1;
  int n=0;
  int m=0;
  for(m=(BITWIDTH/4)-1;m>=0;m--)
  {
    int factor=1;
    for(n=0;n<4;n++)
    {
      
      hexanumbers[m]=hexanumbers[m]+arr[index]*factor;
      index--;
      factor=factor*2;
    }
  }
  //Displaying Hexadecimal
  printf("\n The HexaDecimal No.is 0x");
  int flag=0;
  for(n=0;n<(BITWIDTH/4);n++)
  {
    if(hexanumbers[n]<10)
    {
      if(hexanumbers[n]>1)
      {
        flag=1;
      }
      if (flag==1)
      {
        printf("%d",hexanumbers[n]);
      }
    }
    switch(hexanumbers[n])
    {
      case 10:
      { 
        printf("A");
        break;
      }
      case 11:
      { 
        printf("B");
        break;
      }
      case 12:
      { 
        printf("C");
        break;
      }
      case 13:
      { 
        printf("D");
        break;
      }
      case 14:
      { 
        printf("E");
        break;
      }
      case 15:
      { 
        printf("F");
        break;
      }
    }
  }
  
  return 0;
}
//Main Function
int main()
 {
	
	// Inputing the no from the User
	int givenno=Input();
	//Converting the given the number to binary
	int count=BinaryConvert(givenno,numbers,count);
	//Display binary
	printf("The binary no is ");
	Display(count,numbers);
	//Converting to 1s complement
	OnesComplement(count);
	//Displaying 1s complement
	printf("\n The 1s complement is ");
	Display(count,numbers);
	//Calculating 2s complement
	TwosComplement(count);
	//Displaying Output
	printf("\n The 2s complement no is ");
	Display(count,numbers);
	//Displaying Hexa decimal
	Hexa(numbers);
	
	return 0;
}

created 3 years ago by TIMOTHY ZACHARIAH BINESH

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Read inputs from stdin

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#include <stdio.h>
int main()
{
    char name[50];
    printf("Enter name:");
    scanf("%s", name);
    printf("Hello %s \n" , name );
    return 0;
    
}

About C

C language is one of the most popular general-purpose programming language developed by Dennis Ritchie at Bell laboratories for UNIX operating system. The initial release of C Language was in the year 1972. Most of the desktop operating systems are written in C Language.

Key features:

Structured Programming
Popular system programming language
UNIX, MySQL and Oracle are completely written in C.
Supports variety of platforms
Efficient and also handle low-level activities.
As fast as assembly language and hence used as system development language.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition if-else is used.

if(conditional-expression) {
   // code
} else {
   // code
}

You can also use if-else for nested Ifs and if-else-if ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to if-else-if ladder.

switch(conditional-expression) {    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
...    
    
default:     
 // code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  // code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while(condition) {  
 // code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {
  // code 
} while (condition);

Arrays

Array is a collection of similar data which is stored in continuous memory addresses. Array values can be fetched using index. Index starts from 0 to size-1.

Syntax

One dimentional Array:

data-type array-name[size];

Two dimensional array:

data-type array-name[size][size];

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity.

Two types of functions are present in C

Library Functions:

Library functions are the in-built functions which are declared in header files like printf(),scanf(),puts(),gets() etc.,

User defined functions:

User defined functions are the ones which are written by the programmer based on the requirement.

How to declare a Function

return_type function_name(parameters);

How to call a Function

function_name (parameters)

How to define a Function

return_type function_name(parameters) {  
  //code
}