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String copy without using strcpy() function

Let's write a program to copy a string into another string.



Logic

Declare a duplicate character array.

Iterate the original string till null character '\0'.

     Assign each char to the duplicate string

Append null character '\0' at the end of a duplicate string.



String copy program

Example

#include<stdio.h>

int main()
{
    char str[100],copy_str[100];
    int i;
    
    scanf("%s",str);
    
    /*
     * Let's assume string as "abc"
     */
     
    for(i = 0; str[i] != '\0'; i++)
          copy_str[i] = str[i];
    
    /*
     * i = 0; copy_str[0] = str[0] i.e. 'a'
     * i = 1; copy_str[1] = str[1] i.e. 'b'
     * i = 2; copy_str[2] = str[2] i.e. 'c'
     * i = 3; str[i] == '\0'. It will come out of loop
     */
     
    copy_str[i] = '\0';
    // i = 3; copy_str[3] = '\0';
    
    printf("Copied string = %s",copy_str);
    
    return 0;
}