#include<stdio.h>
#include<string.h>
#include<math.h>
int ninputs;
int dfa[100][2][100] = {0};
int state[10000] = {0};
char ch[10], str[1000];
int go[10000][2] = {0};
int arr[10000] = {0};
int main()
{
int st, fin, in;
int f[10];
int i,j=3,s=0,final=0,flag=0,curr1,curr2,k,l;
int c;
printf("\nFollow the one based indexing\n");
printf("\nEnter the number of states::");
scanf("%d",&st);
printf("\nGive state numbers from 0 to %d",st-1);
for(i=0;i<st;i++)
state[(int)(pow(2,i))] = 1;
printf("\nEnter number of final states\t");
scanf("%d",&fin);
printf("\nEnter final states::");
for(i=0;i<fin;i++)
{
scanf("%d",&f[i]);
}
int p,q,r,rel;
printf("\nEnter the number of rules according to NFA::");
scanf("%d",&rel);
printf("\n\nDefine transition rule as \"initial state input symbol final state\"\n");
for(i=0; i<rel; i++)
{
scanf("%d%d%d",&p,&q,&r);
if (q==0)
dfa[p][0][r] = 1;
else
dfa[p][1][r] = 1;
}
printf("\nEnter initial state::");
scanf("%d",&in);
in = pow(2,in);
i=0;
printf("\nSolving according to DFA");
int x=0;
for(i=0;i<st;i++)
{
for(j=0;j<2;j++)
{
int stf=0;
for(k=0;k<st;k++)
{
if(dfa[i][j][k]==1)
stf = stf + pow(2,k);
}
go[(int)(pow(2,i))][j] = stf;
printf("%d-%d-->%d\n",(int)(pow(2,i)),j,stf);
if(state[stf]==0)
arr[x++] = stf;
state[stf] = 1;
}
}
//for new states
for(i=0;i<x;i++)
{
printf("for %d ---- ",arr[x]);
for(j=0;j<2;j++)
{
int new=0;
for(k=0;k<st;k++)
{
if(arr[i] & (1<<k))
{
int h = pow(2,k);
if(new==0)
new = go[h][j];
new = new | (go[h][j]);
}
}
if(state[new]==0)
{
arr[x++] = new;
state[new] = 1;
}
}
}
printf("\nThe total number of distinct states are::\n");
printf("STATE 0 1\n");
for(i=0;i<10000;i++)
{
if(state[i]==1)
{
//printf("%d**",i);
int y=0;
if(i==0)
printf("q0 ");
else
for(j=0;j<st;j++)
{
int x = 1<<j;
if(x&i)
{
printf("q%d ",j);
y = y+pow(2,j);
//printf("y=%d ",y);
}
}
//printf("%d",y);
printf(" %d %d",go[y][0],go[y][1]);
printf("\n");
}
}
j=3;
while(j--)
{
printf("\nEnter string");
scanf("%s",str);
l = strlen(str);
curr1 = in;
flag = 0;
printf("\nString takes the following path-->\n");
printf("%d-",curr1);
for(i=0;i<l;i++)
{
curr1 = go[curr1][str[i]-'0'];
printf("%d-",curr1);
}
printf("\nFinal state - %d\n",curr1);
for(i=0;i<fin;i++)
{
if(curr1 & (1<<f[i]))
{
flag = 1;
break;
}
}
if(flag)
printf("\nString Accepted");
else
printf("\nString Rejected");
}
return 0;
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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.
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.
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;
}
For loop is used to iterate a set of statements based on a condition.
for(Initialization; Condition; Increment/decrement){
// code
}
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
}
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);
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.
data-type array-name[size];
data-type array-name[size][size];
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 are the in-built functions which are declared in header files like printf(),scanf(),puts(),gets() etc.,
User defined functions are the ones which are written by the programmer based on the requirement.
return_type function_name(parameters);
function_name (parameters)
return_type function_name(parameters) {
//code
}