SQL with Manoj

Q5. Program for String Manipulation (menu based):

Perform following string manipulation –
  i) To find the length of the given string.
 ii) To concatenate two strings.
iii) To reverse a string.
iv) To search a sub string in the given string.

… from College notes (BCA/MCA assignments):
 

#include <iostream.h>
#include <stdlib.h>
#include <conio.h>

int  Str_Length  (char *);
void Str_Reverse (char *, char *);
void Str_Concat  (char *, const char *);
void Str_Copy    (char *, char *);
int  Str_SubStr  (const char *, char *);
int  Str_Comp    (char *, char *);

int main(){
	int ch, num;
	char *str1, *str2;
	str1 = new(char);
	str2 = new(char);
	while(1){
		clrscr();
		cout<<"\n STRING MANIPULATION PROGRAMME";
		cout<<"\n ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ \n";
		cout<<"\n 1 -> String Length.";
		cout<<"\n 2 -> String Reverse.";
		cout<<"\n 3 -> String Concatenation.";
		cout<<"\n 4 -> String Copy.";
		cout<<"\n 5 -> Sub String.";
		cout<<"\n 6 -> String Comparision.";
		cout<<"\n 7 -> Exit.";
		cout<<"\n\n Enter your choice: ";
		cin>>ch;
		switch(ch){
			case 1:
				cout<<"\n Enter a String: ";
				cin>>str1;
				cout<<"\n Length of String "<<str1<<" is: "
					<<Str_Length(str1);
				break;
			case 2:
				cout<<"\n Enter a String: ";
				cin>>str1;
				cout<<"\n Reverse String "<<str1<<" is: ";
				Str_Reverse(str1, str2);
				cout<<str2;
				break;

			case 3:
				cout<<"\n Enter 1st String: ";
				cin>>str1;
				cout<<"\n Enter 2nd String: ";
				cin>>str2;
				cout<<"\n Concate of Strings: "<<str1<<" & 
   "<<str2<<" is: ";
				Str_Concat(str1, str2);
				cout<<str1;
				break;
			case 4:
				cout<<"\n Enter a String: ";
				cin>>str1;
				Str_Copy(str1, str2);
				cout<<"\n String str2 is: "<<str2;
				break;
			case 5:
				cout<<"\n Enter a String: ";
				cin>>str1;
				cout<<"\n Now enter an Another String: ";
				cin>>str2;
				num = Str_SubStr(str1, str2);
				if(num == 1)
					cout<<"\n The Sub String: "<<str2<<" 
  is Present in the String: "
					    <<str1;
				else
					cout<<"\n The Sub String: "<<str2<<" 
  is NOT Present in String: "
					    <<str1;
				break;
			case 6:
				cout<<"\n Enter 1st String: ";
				cin>>str1;
				cout<<"\n Enter 2nd String: ";
				cin>>str2;
				num = Str_Comp(str1, str2);
				if(num == 0)
					cout<<"\n String str1: "<<str1
					    <<" & String str2: "<<str2<<" 
 are Equal";
				else if(num < 0)
					cout<<"\n String str1: "<<str1
					    <<" is Smaller than String str2: " 
    <<str2;
				else
					cout<<"\n String str1: "<<str1
					    <<" is Greater than String str2: " 
    <<str2;
				break;
			default:
				delete(str1);
				delete(str2);
				exit(1);
			} // end of switch.
		getch();
		} // end of while.
	} // end of main.

int Str_Length(char *st){
	int len = 0;
	while(*(st+len) != '\0')
		len++;
	return len;
	}

void Str_Reverse(char *st, char *temp){
	int len, i=0;
	len = Str_Length(st);
	while(len > 0){
		len--;
		*(temp+i) = *(st+len);
		i++;
		}
	*(temp+i) = '\0';
	}

void Str_Concat(char *st1, const char *st2){
	int i = 0, j = 0;
	while(*(st1+i) != '\0')
		i++;
	while(*(st2+j) != '\0'){
		*(st1+i) = *(st2+j);
		i++;
		j++;
		}
	*(st1+i) = '\0';
	}

void Str_Copy(char *st1, char *st2){
	int i=0, len;
	len = Str_Length(st1);
	for(i=0; i<len; i++)
		*(st2+i) = *(st1+i);
	*(st2+i)='\0';
	}

int Str_SubStr(const char *st1, char *st2){
	int i=0, j=0;
	int flag=0;
	while( (*(st1+i) != '\0') && (*(st2+j) != '\0') ){
		if( *(st1+i) == *(st2+j) )
			j++, flag=1;
		else
			flag=0, j=0;
		i++;
		}
	if (flag == 1)
		return 1;
	else
		return 0;
	}

int Str_Comp(char *st1, char *st2){
	int n1, n2, x;
	n1 = Str_Length(st1);
	n2 = Str_Length(st2);
	if(n1 == n2)
		x = 0;
	else if(n1 < n2)
		x = -1;
	else
		x = 1;
	return x;
	}

Output:

STRING MANIPULATION PROGRAMME

1 -> String Length.
2 -> String Reverse.
3 -> String Concatenation.
4 -> String Copy.
5 -> Sub String.
6 -> String Comparision.
7 -> Exit.

Enter your choice: 1

Enter a String: ManojPandey

Length of String ManojPandey is: 11

STRING MANIPULATION PROGRAMME

1 -> String Length.
2 -> String Reverse.
3 -> String Concatenation.
4 -> String Copy.
5 -> Sub String.
6 -> String Comparision.
7 -> Exit.

Enter your choice: 2

Enter a String: Pandey

Reverse of String Pandey is: yednaP

STRING MANIPULATION PROGRAMME

1 -> String Length.
2 -> String Reverse.
3 -> String Concatenation.
4 -> String Copy.
5 -> Sub String.
6 -> String Comparision.
7 -> Exit.

Enter your choice: 3

Enter 1st String: Manoj
Enter 2nd String: Pandey

Concate of Strings: Manoj & Pandey is: ManojPandey