oops week 20

Week 20 solutions

20a) Write a C++ program to write a function void to_lower(char* s) 
that replaces all uppercase characters. 
Don't use any standard library functions.

Program:

#include<iostream>
#include<cstring>
#include<cstdio>
using namespace std;
void to_lower(char* s);
int main()
{
 string st;
 char* s;
 cout<<"Enter any string\n";
 cin>>st;
 s = strdup(st.c_str());
 
 to_lower(s);
 cout<<"\n Original string is :"<<st;
 cout<<"\n modified string is :"<<s; 
 return 0;
}
void to_lower(char* s)
{
 for(int i=0;s[i]!='\0';i++)
  s[i] = (s[i]>='A' && s[i]<='Z')?(s[i]+32):s[i];
}
output:


Enter any string
C++PROGRAMMING

 Original string is :C++PROGRAMMING
 modified string is :c++programming


  

20b) b) Write a C++ program to write a function,char* findx(const char* s, const char* x), 
that finds the first occurrence of the string x in s.

Program:

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

char* findx(const char* s,const char* x);

int main()
{
 string st,st1;
 char* a;
  char* b;
 cout<<"Enter any string\n";
 getline(cin,st);
 cout<<"Enter string to search\n";
 cin>>st1;
 a = strdup(st.c_str());
 b = strdup(st1.c_str());
 
 findx(a,b);
 
 return 0;
}
char* findx(const char* s,const char* x)
{
 char* check=new char[10];
 int j=0;
 int count=0;
 for(int i=0;i<=strlen(s);i++)
 {
  if(isspace(s[i])||s[i]=='\0')
  {
   check[j]='\0';
   j=0;
      if(strcmp(check,x)==0)
      {
    cout<<x<<" is present in the string at index :"<<i-strlen(x)<<endl;
    count++;
    
             }
  }
  else
   check[j++]=s[i];
  
 }
 
 if(count==0)
  cout<<x <<" is not present in the string \n";
  
}

output: 
 
Enter any string
Ramu is a naughty boy and he is also intelligent
Enter string to search
is
is is present in the string at index :5
is is present in the string at index :29

C:\Users\Personal\Desktop>