Write a program that uses a function to copy one string into another without using the strcpy() function available in the standard library of C.

C Programming Language Function in C Language (Article) Function in C Language (Program)

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Program:

 #include <stdio.h>
void string_copy(char [], char []); /* function prototype */


int main()
{
	char a[100]; /*** source string ***/
	char b[100]; /*** destination string ***/
	printf("\n Input source string : ");
	scanf("%[^\n]",a); /* read input source string */
	string_copy(b,a); /* function call */
	printf("\n Destination string : %s\n",b);
	return 0;
}
/*** function definition ***/
void string_copy(char d[], char s[])
{
	int i = 0;
	printf("\n Source string : %s\n",s);
	/* copying the string */
	for (i = 0; s[i] != '\0'; i++)
			d[i] = s[i];
	d[i] = s[i]; /* Copy NUL character to destination string */
}
 

Output:

 Input source string : atnyla

 Source string : atnyla

 Destination string : atnyla

 

Explanation:

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