// Program to find epsilon closure of a given NFA

#include<stdio.h>
#include<string.h>

char result[20][20],copy[3],states[20][20];

void add_state(char a[3],int i){
	strcpy(result[i],a);
}

void display(int n){
	int k=0;
	printf("nnn Epsilon closure of %s = { ",copy);
	while(k < n){
		printf(" %s",result[k]);
		k++;
	}
	printf(" } nnn");
}

int main(){
    FILE *INPUT;
    INPUT=fopen("input.dat","r");
    char state[3];
    int end,i=0,n,k=0;
    char state1[3],input[3],state2[3];
    printf("n Enter the no of states: ");
    scanf("%d",&n);
    printf("n Enter the states n");
    for(k=0;k<3;k++){
		scanf("%s",states[k]);
		
	}
	
	for( k=0;k<n;k++){
		i=0;
		strcpy(state,states[k]);
		strcpy(copy,state);
		add_state(state,i++);
		while(1){
			end = fscanf(INPUT,"%s%s%s",state1,input,state2);
			if (end == EOF ){
				break;
			}
				
			if( strcmp(state,state1) == 0 ){
				if( strcmp(input,"e") == 0 ) {
					add_state(state2,i++);
					strcpy(state, state2);
				}
			}

		}
		display(i);
		rewind(INPUT);
	}
  
    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
}