// C code to delete a node from linked list
#include <stdio.h>
#include <stdlib.h>

typedef struct Node {
	int number;
	struct Node* next;
} Node;

void Push(Node** head, int A)
{
	Node* n = malloc(sizeof(Node));
	n->number = A;
	n->next = *head;
	*head = n;
}

void deleteN(Node** head, int position)
{
	Node* temp;
	Node* prev;
	temp = *head;
	prev = *head;
	for (int i = 0; i < position; i++) {
		if (i == 0 && position == 1) {
			*head = (*head)->next;
			free(temp);
		}
		else {
			if (i == position - 1 && temp) {
				prev->next = temp->next;
				free(temp);
			}
			else {
				prev = temp;

				// Position was greater than
				// number of nodes in the list
				if (prev == NULL)
					break;
				temp = temp->next;
			}
		}
	}
}

void printList(Node* head)
{
	while (head) {
		printf("[%i] [%p]->%p\n", head->number, head,
			head->next);
		head = head->next;
	}
	printf("\n\n");
}

// Drivers code
int main()
{
	Node* list = malloc(sizeof(Node));
	list->next = NULL;
	Push(&list, 1);
	Push(&list, 2);
	Push(&list, 3);

	printList(list);

	// Delete any position from list
	deleteN(&list, 1);
	printList(list);
	return 0;
}
 

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
}