#include <stdio.h>
void quicksort (int number[20], int first, int last)
{
  int i,j,pivot,temp;
  
  if(first < last)
  {
    pivot = first;
    i = first;
    j = last;
    
    while(i < j)
    {
      while(number[i] <= number[pivot] && i <= last)
      i++;
      while(number[j] > number[pivot])
      j--;
      if(i < j)
      {
        temp = number[i];
        number[i] = number[j];
        number[j] = temp;
      }
    }
    
    temp = number[pivot];
    number[pivot] = number[j];
    number[j] = temp;
    quicksort(number,first,j-1);
    quicksort(number,j+1,last);
    
  }
}

int main()
{
  int i,count, number[20];
  
  printf("Enter Number of elements :");
  scanf("%d",&count);
  
  printf("Enter %d elements :",count);
  for(i = 0; i < count ; i++)
  {
    scanf("%d",&number[i]);
  }
  
   printf("Order of Elements before Sorting:");
  for (i = 0; i < count ; i++)
  {
    printf("%d\n",number[i]);
  }
  
  quicksort(number,0,count-1);
  
  printf("Order of Sorted Elements:");
  for (i = 0; i < count ; i++)
  {
    printf("%d\n",number[i]);
  }
  
}
by

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Read inputs from stdin

OneCompiler's C online editor supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample C program which takes name as input and print your name with hello.

#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

  1. Library Functions:

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

  1. 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
}