#include<stdio.h>
#include<stdlib.h>
struct nodet{
	int data;
	struct nodet *left;
	struct nodet *right;
};//node for tree
struct nodel{
	int data;
	struct nodel *next;
};//node for linked list
struct nodel *head=0,*tail=0;
int n=5;//taking input n so that we can globally declare visited array,adjacency matrix.
void bfs();
void enqueue();
void dequeue();
int main(){
	//scanf("%d",&n);
	int root;
	int visited[5]={0};
  int matrix[5][5];
  for(int i=0;i<5;i++){
    for(int j=0;j<5;j++){
      scanf("%d",&matrix[i][j]);
    }
  }
	bfs(1,matrix,visited);
}
//since we want to use row and column of n as well so (n+1)*(n+1)size matrix.
int size=0;//this is declared globally to check if(isEmpty(queue))
void bfs(int root,int matrix[][5],int visited[]){
	int i;
	printf("%d ",root);
	enqueue(root);
	//two conditions we can write (i) size!=0 (ii) head==0;
	while(size!=0){
		i=head->data;
		for(int j=1;j<n;j++){
			if(matrix[i][j]==1 && visited[j]==0){
				visited[j]=1;
				printf("%d ",j);
				enqueue(j);
			}
		}
		dequeue();
	}
}
void enqueue(int j){
if(head==0){
	head=(struct nodel*)malloc(sizeof(struct nodel));
	head->data=j;
	head->next=0;
	tail=head;
}
else{
	struct nodel *p=(struct nodel*)malloc(sizeof(struct nodel));
	p->data=j;
	p->next=0;
	tail->next=p;
	tail=p;
}
size++;
}
void dequeue(){
	struct nodel *p=head;
	head=head->next;
	free(p);
	size--;
}
by

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
}