 #include<stdio.h>
#include<stdlib.h>

void display(int a[],int n);
void bubble_sort(int a[],int n);
void selection_sort(int a[],int n);
void insertion_sort(int a[],int n);

int main()
{
   int n,choice,i;
   char ch[20];
   printf("Enter no. of elements : ");
   scanf("%d",&n);
   int arr[n];
   for(i=0;i<n;i++)
   {
        printf("Enter %d Element : ",i+1);
        scanf("%d",&arr[i]);
   }
   printf("select option for Sorting : \n");

while(1)
   {
    printf("\n1. Bubble Sort\n2. Selection Sort\n3. Insertion Sort\n4. Display Array.\n5. Exit the Program.\n");
    printf("\nEnter your Choice : ");
    scanf("%d",&choice);

    switch(choice)
    {
    case 1:
        bubble_sort(arr,n);
        break;
    case 2:
        selection_sort(arr,n);
        break;
    case 3:
        insertion_sort(arr,n);
        break;
    case 4:
        display(arr,n);
        break;
    case 5:
        return 0;
    default:
    printf("\n Select 1-5 option ----\n");
    }
}
return 0;
}
void display(int arr[],int n)
{
    for(int i=0;i<n;i++)
   {
        printf(" %d ",arr[i]);
   }
}
void bubble_sort(int arr[],int n)
{
  int i,j,temp;
  for(i=0;i<n;i++)
  {
      for(j=0;j<n-i-1;j++)
      {
          if(arr[j]>arr[j+1])
          {
             temp=arr[j];
             arr[j]=arr[j+1];
             arr[j+1]=temp;
          }
      }
  }
printf("After Bubble sort Elements are : ");
display(arr,n);
}
void selection_sort(int arr[],int n)
{
    int i,j,temp;
    for(i=0;i<n-1;i++)
    {
        for(j=i+1;j<n;j++)
        {
            if(arr[i]>arr[j])
            {
             temp=arr[i];
             arr[i]=arr[j];
             arr[j]=temp;
            }
        }
    }
printf("After Selection sort Elements are : ");
display(arr,n);
}
void insertion_sort(int arr[],int n)
{
    int i,j,min;
    for(i=1;i<n;i++)
    {
        min=arr[i];
        j=i-1;
        while(min<arr[j] && j>=0)
        {
            arr[j+1]=arr[j];
            j=j-1;
        }
        arr[j+1]=min;
    }
printf("After Insertion sort Elements are : ");
display(arr,n);
}

created 3 years ago by Shreyansh Shekhar

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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

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
}