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Finding Length of string using user defined functions

#include<iostream>
using namespace std;
int u_strlen(char s[])
{int i;
 for(i=0; s[i]!='\0'; i++);  // starts from first character till last
    return i; // return strlen
}
int main()
{
    // declare the string
    char name[40];
    //accept the string
   // cin>>name; // ignore space in between
    cin.getline(name,40); // accept space also
            cout<<name <<endl; // display string
    int len=u_strlen(name);
cout<<"Length of String is "<<len<<endl;
//display string in reverse order
for(int k=len-1;k>=0;k--)
cout<<name[k]<<endl;
    system("pause");
    return 0;
}
   
   
   
   
   
   
    

String Manipulation (output Answer)

#include<iostream>
using namespace std;
void u_strmanip(char s[])
{int i;
 for(i=0; s[i]!='\0'; i++)  // starts from first character till last
 {
  if(isupper(s[i]))
   s[i]=s[i]+1;
  else
  if(i%2!=0)
  s[i]=s[i+1];
  else
  if(!isalnum(s[i]))
  s[i]='*';
 
}
}
int main()
{
    // declare the string
    char name[40];
    //accept the string
   // cin>>name; // ignore space in between
    cin.getline(name,40); // accept space also
          //  cout<<name <<endl; // display string
   u_strmanip(name);
//display string in reverse order
cout<<name;
    system("pause");
    return 0;
}
   
    Give output for
CoMpuTEr SciENce 2019

Answer
DMNuuUF *TcEFOc *0099

   
   
   
   
    

Concatenating two strings - strcat() - string.h

#include<string.h>
#include<iostream>
using namespace std;
// Program to convert a string into lower case

main()
{
char str[100],str_small[30];
cout<<"Enter a String 1 ";
cin.getline(str,100);

cout<<"Enter a String 2 ";
cin.getline(str_small,100);

cout<<"\n Entered String 1 = " <<str;
cout<<"\n Entered String 2 = " <<str_small;
strcat(str,str_small);
cout<<"\n Changed String = " <<str;
}

changing string into lowercase - strlwr() - string.h

#include<string.h>
#include<iostream>
using namespace std;
// Program to convert a string into lower case

main()
{
char str[100];
cout<<"Enter a String ";
cin.getline(str,100);

cout<<"\n Original String = " <<str;
strlwr(str);
cout<<"\n Changed String = " <<str;
}

converting string into uppercase - strupr() - string.h

#include<string.h>
#include<iostream>
using namespace std;
// Program to convert a string into upper case

main()
{
char str[100];
cout<<"Enter a String ";
cin.getline(str,100);

cout<<"\n Original String = " <<str;
strupr(str);
cout<<"\n Changed String = " <<str;
}

Comparing two strings - case senstive

#include<string.h>
#include<iostream>
using namespace std;
// Program to compare a string

main()
{
char str1[100], str2[100];
cout<<"Enter a String ";
cin.getline(str1,100);
cout<<"\n"<<str1;
cout<<"Enter a String ";
cin.getline(str2,100);
cout<<"\n "<<str2;

if(strcmpi(str1,str2)==0)
cout<<"\n Strings are equal";
else
cout<<"\n Strings are unequal";
}