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To copy the contents of one string to another string using pointer

Thursday, December 4th, 2008

This is the simple implementation of the “Copy” function using the pointers. This program copies the content of one string to another.

Logic : The program asks the user to input the string to copy and stores using the pointer str1. The inner function “stcpy” takes 2 string pointers as arguments. By keeping the length as the reference, it traces till EOF , for each i of this iteration it copies the i-th  letter to the destination string, i.e str2. After the EOL, it puts a NULL to the second line. That gives the duplicated string of the entered.

This function copies the string using the pointer, where earlier program copies the string directly.

#include<stdio.h>
#include<conio.h>
void stcpy(char *str1, char *str2);
void main()
{
char *str1, *str2;
clrscr();
printf(“nnt ENTER A STRING…: “);
gets(str1);
stcpy(str1,str2);
printf(“nt THE COPIED STRING IS…: “);
puts(str2);
getch();
}
void stcpy(char *str1, char *str2)
{
int i, len = 0;
while(*(str1+len)!=’′)
len++;
for(i=0;i<len;i++)
*(str2+i) = *(str1+i);
*(str2+i) = ‘′;
}
Download exe and source code here.

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Author Name :
Ranjith

Total : 8 Comments

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8 Responses to To copy the contents of one string to another string using pointer

  1. saurabhchopra
    July 16th, 2010 at 4:15 pm

    a beautiful program.

  2. Parveez
    July 29th, 2010 at 10:36 pm

    wow nice program…….

  3. Mayuresh Sawant
    July 30th, 2010 at 4:03 pm

    not working….u need to assign valid address to str2. check the updated code

    #include
    #include
    void stcpy(char *str1, char *str2);
    void main()
    {
    char ch; //—-> added

    char *str1, *str2=&ch; //—>assigned
    clrscr();
    printf(“\n\n\t ENTER A STRING…: “);
    gets(str1);
    stcpy(str1,str2);
    printf(“\n\t THE COPIED STRING IS…: “);
    puts(str2);
    getch();
    }
    void stcpy(char *str1, char *str2)
    {
    int i, len = 0;
    while(*(str1+len)!=’′)
    len++;
    for(i=0;i<len;i++)
    *(str2+i) = *(str1+i);
    *(str2+i) = ‘′;
    }

  4. AbhraJYOTi
    May 27th, 2011 at 10:59 am

    program by the website is fully correct,there is no need to assign any valid address for str2…

  5. Deepesh
    June 28th, 2011 at 7:49 pm

    Hey thanx it came as lot of use to me :D

  6. vaishu
    August 16th, 2011 at 7:32 pm

    Its nice. Easy to understand… Thank you…

  7. Sudhansu
    December 29th, 2011 at 9:18 pm

    i lykd da program as it is short yet simple.

  8. sultana
    January 4th, 2012 at 8:24 pm

    plz help me iam not getting the program of c i.e;sorting strings using pointers

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