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	#include<stdio.h>

#include<conio.h>

	#include<string.h>

  void substring();

  void char_occurrence();

  void main()

{

  char str[30],str1[30];

  int ch;

 clrscr();

 do

{

	  printf("\n****MENU****");

  printf("\n1:Sub String");

  printf("\n2:Character Occurrences");

  printf("\n3:Exit");

  printf("\nEnter your choice: ");

  scanf("%d",&ch);


 switch(ch)

	{

  case 1:substring();

	  break;


	  case 2:char_occurrance();

	  break;

	  case 3:exit(0);

	  break;

	  }

}

  while(ch!=3);

  getch();

	}

	
	  void substring()

	{

	  char str[30],ch[30];

	  fflush(stdin);

	  printf("\nEnter the first string: ");

	  gets(str);

  fflush(stdin);

	  printf("\nEnter the second string: ");

  gets(ch);

  if(strstr(str,ch))

	{


  printf("\nThe given string is sub string");
	}

  else

{

	  printf("\nThe given string is not sub string");

}

	}


  void char_occurrennce()

	{

  char str2[30],ch;

  int i,count=0;

  fflush(stdin);

 printf("\nEnter the string: ");

	  gets(str2);

  fflush(stdin);

  printf("\nEnter the character from string to find occurrence: ");

  scanf("%c",&ch);

	  for(i=0;str2[i]!='\0';i++)

	{

	  if(ch==str2[i])

{

count++;

	}

}

  printf("\nThe occurrence of character is: %d",count);

	}









Output:

10) Write a menu driven program in �C� which performs the following operations on strings. Write separate function for each option - Check if one string is substring of another string - Count number of occurrences of a character in the string. - Exit.

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10) Write a menu driven program in �C� which performs the following operations on strings. Write separate function for each option
- Check if one string is substring of another string
- Count number of occurrences of a character in the string.
- Exit.