C Program to Copy String with and without strcpy() Function

The strcpy() function copies string2, including the ending null character, to the location that is specified by string1. The strcpy() function operates on null-ended strings.

Copy String with strcpy() Function

In this tutorial, you will learn to use the strcpy() function in C programming to copy strings under the string.h library.

The structure of strcpy() function is:

char* strcpy(char* destination, const char* source);

strcpy(destination, source) is a system defined method used to copy the source string into the destination variable.

Example: With strcpy() function in C

#include <stdio.h>
#include <string.h>

int main () {
   char src[50];
   char dest[90];
  
   memset(dest, '\0', sizeof(dest));
   strcpy(src, "This is techzpad.com c progarm tutorial ");
   strcpy(dest, src);

   printf("Our Final copied string : %s\n", dest);
   
   return(0);
}

Let us compile and run the above program that will produce the following result:

Our Final copied string : This is techzpad.com c progarm tutorial

Copy String without strcpy() Function

While initializing a string, there is no need to put a null character at the end, as the compiler provides it automatically.

For example, char tpd[] = "TechzPad"; is a correct statement. However while copying one string into another, terminating the destination string with a null character is mandatory, to use it in future.

Example: without strcpy() function

#include <stdio.h>
#include <string.h>
 
int main()
{
  	char Str[100]; 
        CopyStr[100];
  	int i;
 
  	printf("\n Please Enter any String :  ");
  	gets(Str);

  	for (i = 0; Str[i]!='\0'; i++)
  	{
  		CopyStr[i] = Str[i];
  	}
  	CopyStr[i] = '\0';

  	printf("\n String that we coped into CopyStr = %s", CopyStr);
  	printf("\n Total Number of Characters that we copied = %d\n", i);
  	
  	return 0;
}

Let us compile and run the above program that will produce the following result:

Please Enter Any String: TechzPad
String that we coped into CopyStr = TechzPad
Total Number of Characters that we copied = 8

Also Read: C Program to Find the Largest Number Among Three Numbers