Question

A C++ question:

I want to indent the code of this C++ program:

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

int lastIndexOf(char *s, char target)
{
int n=strlen(s);
for(int i=n-1;i>=0;i--)
{

if(s[i]==target)
{
return i;
}
}
return -1;
}

void reverse(char *s)
{
int n=strlen(s);
int i=0,j=n-1;
while(i<=j)
{
char temp=s[i];
s[i]=s[j];
s[j]=temp;
i++;
j--;
}
return;
}

int replace(char *s, char target, char replacementChar)
{
int len=strlen(s);
int total=0;
for(int i=0;i<len;i++)
{
if(s[i]==target)
{
s[i]=replacementChar;
total+=1;
}
}
return total;
}

int findSubstring(char *s, char substring[])
{
int len1=strlen(s);
int len2=strlen(substring);
for(int i=0;i<len1-len2+1;i++)
{
bool found=true;
for(int j=i;j<i+len2;j++)
{
if(s[j]==substring[j-i])
{
}
else
{
found=false;
break;
}
}

if(found==true)
{
return i;
}
}
return -1;
}
bool isPalindrome(char *s)
{
int n=strlen(s);
int i=0,j=n-1;
while(i<=j)
{
if(s[i]==s[j])
{
i++;
j--;
}
else
{
return false;
}
}
return true;
}

void reverseWords(char *s)
{
int len=strlen(s);
int j=0;
for(int i=0;i<len;i++)
{
if(s[i]==' ')
{
int p1=j,p2=i-1;
while(p1<=p2)
{
char temp=s[p1];
s[p1]=s[p2];
s[p2]=temp;
p1++;
p2--;
}
j=i+1;
}
}
{
int p1=j,p2=len-1;
while(p1<=p2)
{
char temp=s[p1];
s[p1]=s[p2];
s[p2]=temp;
p1++;
p2--;
}
}
reverse(s);
return;
}

int main()
{
int len;
cin>>len;
cin.ignore();
char*s=new char[len];
scanf("%[^\n]%*c", s);
char ch1='a',ch2='A';
int in=lastIndexOf(s,'a');
if(in==-1)
{
cout<<ch1<<" not found in"<<s<<endl;
}
else
{
cout<<ch1<<" found at "<<in<<" in "<<s<<endl;
}
cout<<endl;
reverse(s);
cout<<"reversed string is: "<<s<<endl;
cout<<endl;
int count=replace(s,'a','A');
cout<<"Total number of replacements for "<<ch1<<" to "<<ch2<<" are "<<count<<endl;
cout<<endl;

char substring[]="abc";

int start=findSubstring(s,substring);
if(start==-1)
{
cout<<substring<<" not found in "<<s<<endl;
}
else
{
cout<<substring<<" found at "<<start<<" in "<<s<<endl;
}
cout<<endl;
bool check=isPalindrome(s);
if(check==true)
{
cout<<s<<" is a palindrome."<<endl;
}
else
{
cout<<s<<" is not a palindrome."<<endl;
}
cout<<endl;
cout<<"Before reversing words: "<<s<<endl;
reverseWords(s);
cout<<"After reversing words: "<<s<<endl;

return 0;
}

Answer 1

The indented version of the given code and the corresponding output are as follows:

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

int lastIndexOf(char *s, char target)
{
        int n=strlen(s);
        for(int i=n-1;i>=0;i--)
        {       
                if(s[i]==target)
                {
                  return i;
                }
        }
        return -1;
}

void reverse(char *s)
{
        int n=strlen(s);
        int i=0,j=n-1;
        while(i<=j)
        {
                char temp=s[i];
                s[i]=s[j];
                s[j]=temp;
                i++;
                j--;
        }
        return;
}

int replace(char *s, char target, char replacementChar)
{
        int len=strlen(s);
        int total=0;
        for(int i=0;i<len;i++)
        {
                if(s[i]==target)
                {
                        s[i]=replacementChar;
                        total+=1;
                }
        }
        return total;
}

int findSubstring(char *s, char substring[])
{
        int len1=strlen(s);
        int len2=strlen(substring);
        for(int i=0;i<len1-len2+1;i++)
        {
                bool found=true;
                for(int j=i;j<i+len2;j++)
                {
                        if(s[j]==substring[j-i])
                        {
                        }
                        else
                        {
                                found=false;
                                break;
                        }
                }
                
                if(found==true)
                {
                        return i;
                }
        }
        return -1;
}

bool isPalindrome(char *s)
{
        int n=strlen(s);
        int i=0,j=n-1;
        while(i<=j)
        {
                if(s[i]==s[j])
                {
                        i++;
                        j--;
                }
                else
                {
                        return false;
                }
        }
        return true;
}

void reverseWords(char *s)
{
        int len=strlen(s);
        int j=0;
        for(int i=0;i<len;i++)
        {
                if(s[i]==' ')
                {
                        int p1=j,p2=i-1;
                        while(p1<=p2)
                        {
                                char temp=s[p1];
                                s[p1]=s[p2];
                                s[p2]=temp;
                                p1++;
                                p2--;
                        }
                        j=i+1;
                }
        }
        {
        int p1=j,p2=len-1;
        while(p1<=p2)
        {
                char temp=s[p1];
                s[p1]=s[p2];
                s[p2]=temp;
                p1++;
                p2--;
        }
        }
        reverse(s);
        return;
}

int main()
{
        int len;
        cin>>len;
        cin.ignore();
        char*s=new char[len];
        scanf("%[^\n]%*c", s);
        char ch1='a',ch2='A';
        int in=lastIndexOf(s,'a');
        if(in==-1)
        {
                cout<<ch1<<" not found in "<<s<<endl;
        }
        else
        {
                cout<<ch1<<" found at "<<in<<" in "<<s<<endl;
        }
        cout<<endl;
        reverse(s);
        cout<<"reversed string is: "<<s<<endl;
        cout<<endl;
        int count=replace(s,'a','A');
        cout<<"Total number of replacements for "<<ch1<<" to "<<ch2<<" are "<<count<<endl;
        cout<<endl;
        
        char substring[]="abc";
        
        int start=findSubstring(s,substring);
        if(start==-1)
        {
                cout<<substring<<" not found in "<<s<<endl;
        }
        else
        {
                cout<<substring<<" found at "<<start<<" in "<<s<<endl;
        }
        cout<<endl;
        bool check=isPalindrome(s);
        if(check==true)
        {
                cout<<s<<" is a palindrome."<<endl;
        }
        else
        {
                cout<<s<<" is not a palindrome."<<endl;
        }
        cout<<endl;
        cout<<"Before reversing words: "<<s<<endl;
        reverseWords(s);
        cout<<"After reversing words: "<<s<<endl;
        
        return 0;
}

Output: