Search,insert,swap,delete word from string

[Khubaib]

Hi all! I am making a program to input a paragraph from the user and then finds/swap/delete/insert a word in that paragraph. I am stuck on the first stage. I have made a program that just returns the starting index of the searched word. But its case sensitive and i want to search case insensitive word. Can someone guide me plz?

#include <iostream>
#include <cstring>
using namespace std;

int main()
{
char str[500],find[500],option;
cout<<"Enter a text paragraph: ";
cin.getline(str,500,'$');
cout<<"\n\t\t String Operations "<<endl;
cout<<"\t Find\t\t:\t\t[F]"<<endl;
cout<<"\t Replace\t:\t\t[R]"<<endl;
cout<<"\t Delete\t\t:\t\t[D]"<<endl;
cout<<"\t Insert\t\t:\t\t[I]"<<endl;
cout<<"\t DeleteSpecial\t:\t\t[S]"<<endl;
cout<<"\t Print\t\t:\t\t[P]"<<endl;
cout<<"\t Quite\t\t:\t\t[Q]"<<endl;
cout<<"\t Enter Option\t:\t";
cin>>option;
cin.ignore(100,'\n');
while (!(option=='F' || option=='f' || option=='R' || option=='r' || option=='D' || option=='d' || option=='I' || option=='i' || option=='S' || option=='s' || option=='P'|| option=='p'|| option=='Q'|| option=='q'))
{
cout<<"\nInvalid option!"<<endl<<endl;
cout<<" Enter One of these Options only"<<endl<<endl;
cout<<"\t Find\t\t:\t\t[F]"<<endl;
cout<<"\t Replace\t:\t\t[R]"<<endl;
cout<<"\t Delete\t\t:\t\t[D]"<<endl;
cout<<"\t Insert\t\t:\t\t[I]"<<endl;
cout<<"\t DeleteSpecial\t:\t\t[S]"<<endl;
cout<<"\t Print\t\t:\t\t[P]"<<endl;
cout<<"\t Quite\t\t:\t\t[Q]"<<endl;
cout<<"\t Enter Option\t:\t";
cin>>option;
cin.ignore(100,'\n');
}
switch(option)
{
case 'F': case 'f':
{
cout<<"Enter the word to find: ";
cin.get(find,100);
cin.ignore(100,'\n');
int wordlen=strlen(find);
for (int i=0;str[i];i++)
{
if (str[i]==find[0])
{
for (int j=0;find[j];j++)
{
if (str[i]==find[j])
{
if ((j+1)==wordlen)
{
cout<<find<<" is found at index "<<(i+1-wordlen)<<endl;
}
i++;
}
}
}
}
}
}
return 0;
}

[Khubaib]

Please help!

[JLBorges]

Read: http://www.mochima.com/tutorials/strings.html

Paying special attention to: 'Search Facilities' and 'Erasing and Replacing Substrings'


> But its case sensitive and i want to search case insensitive word.

Make a copy of the string and convert every upper case character in the copy to lower case. Likewise with the word being searched for. Use the copies for finding start indices.