// Program character encryption
#include <iostream.h>
#include <ctype.h>
#include<conio.h>
void main()
{
char mychars[10] =
{'g','h','i','a','b','c','d','e','f', 'l'};
clrscr();
for(int i = 0; i < 10; i++)
mychars[i] = toupper(mychars[i]);
for( i = 0; i < 10; i++)
cout <<
mychars[i];
cout << '\n';
for( i = 0; i < 10; i++)
mychars[i] += 3;
for( i = 0; i < 10; i++)
cout <<
mychars[i];
cout << '\n';
for( i = 0; i < 10; i++)
mychars[i] -= 3;
for( i = 0; i < 10; i++)
cout <<
mychars[i];
getch();
}
//
Program2 for illustrating basic
encryption and decryption using functions
#include<iostream.h>
#include<conio.h>
#define FACTOR 95
void encrypt (char
*);
void decrypt (char
*);
void main(void)
{
char str[20]="I
like C++";
cout<<"Original String:\n";
cout<<str;
cout<<endl<<endl;
encrypt(str);
cout<<"After Encryption:\n";
cout<<str;
cout<<endl<<endl;
cout<<"After Decryption:\n";
decrypt(str);
cout<<str;
cout<<endl;
getch ();
}
void encrypt(char *str)
{
while(*str!='\0')
{
*str+=FACTOR;
str++;
}
}
void decrypt(char *str)
{
while(*str!='\0')
{
*str -= FACTOR;
str++;
} }
/*
Program3. C++
example program to show how
case(uppercase and lowercase) of strings can be changed from one to the other
*/
#include<iostream.h>
#include<conio.h>
void to_upper(char *);
void to_lower(char *);
void main(void)
{
char
str[50]="I Love C++. The
number 1 language!";
clrscr();
to_upper(str);
cout<<str;
to_lower(str);
cout<<endl;
cout<<str;
cout<<endl;
getch();
}
void to_upper(char *str)
{
while(*str!='\0')
{
if(*str>=97 && *str<=122)
*str-=32;
str++;
}
}
void to_lower(char *str)
{
while(*str!='\0')
{
if(*str>=65 && *str<=90)
*str+=32;
str++;
}
}
Program4: //
Program for string handling functions
#include<iostream.h>
#include<conio.h>
#include<string.h>
Void main()
{
Char s1[20], s2[20];
Cout<<” \n enter
the first string \n”;
Cin>>s1;
Cout<<” \n enter
the second string \n “;
Cin>>s2;
Cout<<” \n
Length of the first string is \n”;
Cout<<strlen(s1);
Cout<<” \n
Length of the Second string is \n”;
Cout<<strlen(s2);
If(!strcmp(s1,s2))
Cout<<”\n the
strings are same \n”;
Strcat(s1,s2);
Cout<<” \n
concatenated string is \n”;
Cout<<s1<<endl;
Strcpy(s1, “ this is a
test \n“);
Cout<<” \n after
copying the string is \n”<<s1<<endl;
Getch();
}
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