C program for string replacing function using pointers?

Answer 1

What U exactly want?

Here I am giving "complete c program for string manipulation using pointer "

/*********************************PRACT.*********************************
Title:: STRING MANIPULATION(functions implemented with pointers).
Operations covered :1:Accept 2:Display 3:String Length 4:String Copy 5:String Reverse
------------------- 6:Check for Palindrome 7:String Comparison
8:Substring(String Searching) 9:StrConcatinate
*************************************************************************/
#include
#include
/*
I Am Just Giving FUNCTION DEFINATION 1'st & then "main function.
*/

//Fun.str
void str()
{ int i;
printf("\n\n");
for(i=0;i<30;i++)
printf("*~");
}
//Fun.1 for Accepting string.
void Accept(char *a)
{ printf("\nEnter The String : ");
scanf("%s",a);
}
//Fun.2 Displaying string which is accepted in Fun.1
void Disp(char *a)
{ printf("\n\tString =%s",a);
}

//Fun.3 Displaying length of string.
int len(char *a)
{ char *p;
int count=0;
for(p=a;*p!='\0';p++)
count++; //incrementing count till for loop exists
return(count);
}

//Fun.4 To copy string a/b.
void copy(char *a,char *r)
{ while(*a!='\0')
{ *r=*a; //coping the string character by character.
r++;a++;
}
*r='\0';
}

//Fun.5 To find out reverse of string a/b.
void reverse(char *a)
{ char *p,*q;
int count=0;
for(p=a;*p!='\0';p++)
count++;
while(*p!='\0')
p++;
while(count>0)
{ p--;
count--;
printf("%c",*p);
}
}

//Fun.6 Check for palindrome
int pl(char *a)
{ char *p,*q;
p=q=a;
while(*q!='\0')
q++; // q represents the null character.
q--;//q represents the last character of string.
while(p{ if(*p!=*q)
return(0);
p++;q--;
}
return(1);
}

//Fun.7 comparing 2 strings .
int compare(char *a,char *b)
{ while(*a!='\0')
{ if(*a==*b)
return(1);
a++;b++;
}
return(0);
}

//Fun.8 searching a string
int Substr(char *a ,char *b)
{ int N1,N2,count=0;
char *p,*q,*k;
for(N1=0;*(a+N1)!='\0';N1++); //N1=length of string1
for(N2=0;*(b+N2)!='\0';N2++); //N2=length of string2

for(p=a;p<=a+N1-N2+1;p++)
{ k=p;
for(q=b;*k==*q&& *q!='\0';q++,k++); // string b[] is matched in string a[] from the position p.
if(*q=='\0')
{ count++;
printf("\nLOCATION = %d",p-a+1);
}
} return(count);
}

//Fun.9 String concatination.
void StrCon(char *a,char *b)
{ char *p,*q;
while(*a!='\0')
a++;
while(*b!='\0')
{ *a=*b;
a++; b++;
}
*a='\0';
}

/**************** "main function " ****************************/
void main()
{ char a[25],b[25],c[25],s;
int k,l;
clrscr();
do
{str();
printf("\n\t\tSTRING MANIPULATION WITH POINTER.");
str();
printf(" \n\t1:Accept \n\t2:Display \n\t3:String Length \n\t4:String Copy \n\t5:String Reverse \n\t6:Check for Palindrome \n\t7:String Comparison\n\t8:Substring(String Searching) \n\t9:StrConcatinate \n\t10:Exit.");
printf("\nEnter The Choice..... . . . . " );
scanf("%d",&k);
switch(k)
{ case 1:Accept(a);
break;
case 2:Disp(a);
break;
case 3:l=len(a);
printf("Length of string %s = %d",a,l);
break;
case 4:copy(a,c);
printf("Copied String = %s",c);
break;
case 5:reverse(a);
break;
case 6:l=pl(a);
if(l==0)
printf("\n%s : NOT a PALINDROME.",a);
else
printf("\n%s is PALINDROME.",a);
break;
case 7:Accept(b);
l=compare(a,b);
if(l==1)
printf("\nStrings (%s & %s )are SAME",a,b);
else
printf("\nStrings (%s & %s )are Different",a,b);
break;
case 8:Accept(b);
l=Substr(a,b);
if(l>=1)
printf("\n%s is SubString of %s \nOccurunce : %d times.",b,a,l);
else
printf("\n%s is NOT a SubString of %s .",b,a);
break;
case 9:Accept(b);
StrCon(a,b);
printf("Concatinated string = %s ",a);
break;
case 10:exit();
default:printf("\nPlease enter Proper Value. ");
}
printf("\nDo U want to Continue(y/n)? ");
scanf("%s",&s);
}while(s=='y's=='Y');
if(s=='n')
exit();
getch();
}

/* Hope it is helpful */