#include<stdio.h>
#include<stdlib.h>
typedef struct node node;
struct node{
  int data;
  node* next;
};
node* newnode(int d){
  node* newNode = (node*) malloc(sizeof(node));
  newNode->data = d;
  newNode->next = NULL;
  return newNode;
}
void insert_first(node** head,int d){
  node* newNode = newnode(d);
  newNode->next = (*head);
  (*head) = newNode;
}
void insert_mid(node** head,int x,int d){
   node* newNode = newnode(d);
   node* temp = (*head);
   while(temp->data != x)
   temp = temp->next;
   
   newNode->next=temp->next;
   temp->next=newNode;
}
void insert(node** head,int d){
  if((*head) == NULL)
  (*head) = newnode(d);
  else{
    node* temp = (*head);
    while(temp->next != NULL)
    temp = temp->next;
    
    temp->next = newnode(d);
  }
}
void delete(node** head,int x){
  node* temp = (*head), prev = NULL;
  while(temp->data != x)
  {
    prev = temp; temp = temp->next;
  }
  prev->next = temp->next;
  free(temp);
  
}
void display(node** head){
  node* temp = (*head);
  while(temp != NULL){
    printf("%d->",temp->data);
    temp = temp->next;
  } 
  printf("NULL");
}
int main(){
  node* head = NULL;
  insert(&head,100); insert(&head,400); 
  insert(&head,550); insert(&head,650);
  insert_first(&head,380);
  insert_mid(&head,100,120);
  delete(&head,400);
  display(&head);
}

C Language online compiler

Write, Run & Share C Language code online using OneCompiler's C online compiler for free. It's one of the robust, feature-rich online compilers for C language, running the latest C version which is C18. Getting started with the OneCompiler's C editor is really simple and pretty fast. The editor shows sample boilerplate code when you choose language as 'C' and start coding!

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
}