[C] Help with Strings

techking_dinesh · 21-08-2010, 10:51 PM

Hello I need to do a menu driven programme on strings
without using the library functions like strcpy and stuff

I need to do the programme in 2 modes..
1.Using functions
2. using pointers

I am almost Done with part I... I am not able to code string compare , Palindrome and Sub String

I am hopeless with 2nd part of pointers

Help me as much as u can

Here is my code

Code:

// Assignment 2 Coded By Dinesh Modi

#include<stdio.h>
#include<conio.h>
void create_set(char a[100],int size1);
void print_set(char a[100],int size1);
void copy_set(char a[100],int size1,char c[100]);
void reverse_set(char a[100],int size1,char c[100]);
//void stringcmp(char a[100], char b[100]);

void main()

{
    char a[100],b[100],c[100];
    int i,size1,size2,j,ch;
    clrscr();

do
{
printf("\n\n\n String Operations Menu");
printf("\n 1. Create String");
printf("\n 2. Display String");
printf("\n 3. Copy String");
printf("\n 4. Reverse String");
printf("\n 5. Compare String");
printf("\n 6. Palindrome");
printf("\n 7. Exit");
printf("\n\n Enter your choice: ");
scanf("%d",&ch);
switch(ch)
{
case 1: // Creation of String
printf("\n\n Enter the size of first string:");
            scanf("%d",&size1);
            printf("\n\n enter %d characters: ",size1);
            create_set(a,size1);
            printf("\n\n Enter the size of second string:");
            scanf("%d",&size2);
            printf("\n\n Enter %d character: ",size2);
            create_set(b,size2);
            break;

case 2:
    printf("\n\n String is: \n");
print_set(a,size1);
    printf("\n\n String is: \n");
print_set(b,size2);
break;

case 3: // Copy String
copy_set(a,size1,c);
printf("\n Copied String is : ");
print_set(c,size1);
break;

case 4: // Reverse of String
reverse_set(a,size1,c);
printf("\n Reverse of String is : ");
print_set(c,size1);
break;

case 5: // Comparision of string

if(size1!=size2)
printf("they are different strings");
else
    while(a[i]!='\0')
    if(a[i]==b[i])
    i++;
else

printf("They are different strings");
//exit(0);

printf("Both are same");

break;


default:
printf("\n Enter Proper Choice");
}
}
while(ch<8);
}

// Function Starts Here

// String Creation

    void create_set(char a[100],int size1)
    {
        int i;
        for(i=0;i<size1;i++)
        {
        scanf("%s",&a[i]);
        }
       }

// String Display

 void print_set(char a[100],int size1)
       {
         int i;
     //    printf("\n\n String is: \n");
        for(i=0;i<size1;i++)
        {
            printf("%c",a[i]);
        }
    }

// Copy String Functon

    void copy_set(char a[100],int size1,char c[100])
    {
        int i,j;
        for(i=0;i<=size1;i++)
        {
        j=0;
            for(j=0;j<=size1;j++)
              {
            c[i]=a[i];
            j++;
         }

        }
    }

// Reverse String Function

 void reverse_set(char a[100],int size1,char c[100])
     {
        int i,j;
        for(i=size1;j=0,i>=0;i--,j++)
        {
              for(j=0;j>size1;j++)
               {
                c[i]=a[i];
                  printf("%c",c[j]);

         printf("%c",c[i]);
        }


        printf("%c",c[j]);
     }
    }

/* Compare

void stringcmp(char a[100], char b[100])
{
   int i,j;

   for(i=0;a[i]!='\0';i++)
   {
      for(j=0;b[j]!='\0';j++)
      {
        if(a[i] == b[j])
        continue;
      }
   }

   if (i==j)
   {
     printf("String s1:%s and s2:%s are EQUAL\n",a[i],b[j]);
   }
   else
     printf("String s1:%s and s2:%s are NOT EQUAL\n",a[i],b[j]);

}

*/

// Palindrome Logic
/*


char string,string1;
printf("enter the string:\n");
scanf("%s",&string);
strcpy(string1,string);
strrev(string);
if(strcmp(string1,string)==0)
{
printf("string is palendrome");
}
else
{
printf("string is not palendrome");
}



// Pal function

for(i=0;a[i]!=0;i++);
for(j=0;i!=0;i--)
{ b[j++]=a[i];
}
b[j]=0;
for(i=0;a[i]!=0;i++)
{ if(a[i]!=b[i])
{ f=0;
break;
}
}
if(f==0)
printf("NOT PALINDROME");
else
printf("PALINDROME");
*/

Waiting for proper guidance

arpanmukherjee1 · 22-08-2010, 10:15 PM

in ur case pointer function is of no use:

Code:

void fun1(char a[]) == void fun1(char *a)

u must return value for string compare

techking_dinesh · 23-08-2010, 08:29 AM

Well we are learning C.. Our Assignment is

Menu
1. Without Pointer
2. With Pointer

On pressing 1, d string menu appears where everything is calculated without pointers
& on 2 , d same menu appears bt the calculations are done with pointers

Use of library functions is not allowed