String Manipulations using C

C Program :

	/* Aim: Write a menu driven program to perform different6 operations on strings. Write seperate functions for each option.
	1] Check if one string is substring of another
	2] Count number of occurences of character in string
	3] Replace all occurences of a character by another
	*/
	#include<stdio.h>
	#include<ctype.h>
	#include<string.h>
	#define size 100
	void subStrCheck(char str[],char subStr[]); // subStrCheck Function Prototype
	int CheckStr(char str[],char ch); // CheckStr Function Prototype
	void replaceStr_Ch(char str[],char ch,char ch1); // replaceStr_Ch Function Prototype
	void main()
	{
	char str[size],subStr[size],ch,ch1;
	int ch2;
	do{
	printf("\n \t \t ****Menu****");
	printf("\n 1.Check if one string is substring of another");
	printf("\n 2.Count number of occurences of character in string");
	printf("\n 3.Replace all occurences of a character by another");
	printf("\n 4.Exit \n");
	printf("\n Which operation do you want to perform:-");
	scanf("%d",&ch2);
	if(ch2==2 || ch2==3)
	{
	printf("\n Enter any string:-");
	scanf("%s",str);
	printf("\n Enter any character to check its occurence in the string:-");
	scanf(" %c",&ch);
	}
	switch(ch2)
	{
	case 1:
	printf("\n Enter any string:-");
	scanf("%s",str);
	printf("\n Enter string to check as substring in \"%s\":-",str);
	scanf("%s",subStr);
	subStrCheck(str,subStr);
	break;
	case 2:
	printf("\n %d times '%c' occured in \"%s\" \n \n",CheckStr(str,ch),ch,str);
	break;
	case 3:
	printf("\n Enter a character to replace '%c' in \"%s\":-",ch,str);
	scanf(" %c",&ch1);
	replaceStr_Ch(str,ch,ch1);
	break;
	default:
	printf("\n Invalid Choice. \n \n");
	}}while(ch2!=4);
	} // End of main
	void subStrCheck(char str[],char subStr[])
	{
	int LED=0,i,j,count=1,count1=1;
	for(i=0;str[i]!='\0';i++)
	count++;
	for(i=0;subStr[i]!='\0';i++)
	count1++;
	for(i=0;i<=count-count1;i++)
	{
	for(j=i;j<i+count1;j++)
	{
	LED=1;
	if(str[j]!=subStr[j-i])
	{
	LED=0;
	break;
	}
	}
	if(LED==1)
	break;
	}
	if(LED==1)
	printf("\n \"%s\" is a substring of \"%s\" \n \n",subStr,str);
	else
	printf("\n \"%s\" is not a substring of \"%s\" \n \n",subStr,str);
	}
	// CheckStr Function
	int CheckStr(char str[],char ch)
	{
	int i,count=0;
	for(i=0;i<=strlen(str)-1;i++)
	{
	if(str[i]==ch)
	count++;
	}
	return count;
	}
	// replaceStr_Ch Function
	void replaceStr_Ch(char str[],char ch,char ch1)
	{
	int i,count=0;
	for(i=0;i<=strlen(str)-1;i++)
	{
	if(str[i]==ch)
	str[i]=ch1;
	}
	printf("\n New string formed after replacing '%c' with '%c' is \"%s\" \n \n",ch,ch1,str);
	}
	/* Ouput of above code:-
	[root@localhost Computer Science C]# cc e12b1.c
	[root@localhost Computer Science C]# ./a.out
	****Menu****
	1.Check if one string is substring of another
	2.Count number of occurences of character in string
	3.Replace all occurences of a character by another
	4.Exit
	Which operation do you want to perform:-1
	Enter any string:-Hello
	Enter string to check as substring in "Hello":-lo
	"lo" is a substring of "Hello"
	*/

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