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[code]void main()
{
int i = 0 , j = 0 ;
string str ; // str contains i/p string
string str1 = "" , temp = "" ;
string ident = "" ;
string key=""; //storing identifiers
string consta=""; //storing constants
string operat=""; //storing operators
string symb=""; //storing symbols
string str3[]={"int","float","long","double","char","string","boolean","if","else"
,"for","while","switch","class","include","void","cout","cin"};//array of keywords
string str4[]={"+","-","*","/","%","<",">","=","!"};//array of operators
cout<<"Enter a string\t:";
getline(cin,str,'$'); //getting input
cout<<"\n entered string-\t"<<str<<endl;
j=str.length(); //getting length of string
while(j>0)
{
while(j>0) //inside this block each strings are separated
{
if(str[i]==' ')
break;
temp=str[i];
str1.append(temp);
i++;
j--;
}
if(str1[0]!=' ')
{
if(isalpha(str1[0])) //string checked for an alphabet
{
int c=0;
for(int k=0;k<17;k++)
{
if(str1==str3[k]) // matching with a keyword
{
c=1;
str1.append(" ");
key.append(str1); //appending to keyword
}
}
if(c==0) //else a identifier
{
str1.append(" ");
ident.append(str1); //appending to identifier
}
}
else if(isdigit(str1[0])) //checked for a digit
{
str1.append(" ");
consta.append(str1); //appending to constants
}
else
{
int c=0;
for(int k=0;k<9;k++)
{
if(str1==str4[k]) //check for an operator
{
str1.append(" ");
c=1;
operat.append(str1); //appending to operator
}
}
if(c==0) //else just a symbol
{
symb.append(str1); //appending to symbol
}
}
}
i++;
str1="";
j--;
}
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