memmove() In C

Purpose Of memmove()

memmove() is one of the inbuilt string function in c programming which is used to copy n character from memory location src to memory location des

memmove() facts

memmove() is very much similar to memcpy(), both are capable of ovelapping characters, in some cases memcpy() fails to overlap, thus memmove() is a safer one in overlapping the characters of a string.

How memmove() Works

The following diagram clearly illustrate the working principle of memmove() inbuilt string function in C.

In the above diagram memmove() takes three parameter. First two parameters are string whereas third parameter is an integer, third parameter tells the compiler how much characters should be overlapped from src should be copied to des.

Syntax Of memmove()

• memmove() accepts three parameters.
• First two parameters are string whereas third parameter is an integer.
• To use memmove() inbuilt string function in C, we need to declare #include<string.h> header file.

memmove(src, des, size);

C Program - memmove()

Let us work through memmove() function, In the following program we will overlap n characters from memory location src to memory location des.

#include <stdio.h>
#include<string.h>
int main()
{
int src[5] = {0, 1, 2, 3, 4};
int des[5] = {5, 6, 7, 8, 9}, i;
memmove( des, src, 5*sizeof(int));
for(i=0; i<5; i++)
printf("des[%d] = %d\n", i, des[i]);
return 0;
}

des[0] = 0
des[1] = 1
des[2] = 2
des[3] = 3 
des[4] = 4

C Program - Without memmove()

#include <stdio.h>
#include<string.h>
int main()
{
char *src="2braces.com";
char des[15] ="overwrite-it";
char len = 11, i;
for(i=0; i<len;i++)
des[i] = src[i];
printf("%0.11s",des);
return 0;
}

2braces.com

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