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memcpy() function in C with Example

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mahmoud2506
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2022-05-03
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memcpy() function in C with Example

memcpy() function

memcpy() is a library function, which is declared in the “string.h” header file - it is used to copy a block of memory from one location to another (it can also be considered as to copy a string to another).

Syntax of memcpy():

    memcpy(void*str1, const void* str2, size_t n);

It copies n bytes of str2 to str1.

 

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mahmoud2506
2022-05-03
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Example 1) Copying a string to another (all bytes of a string to another)

#include <stdio.h>
#include <string.h>
#define MAX_CHAR 50

int main(void) {
	char str1[MAX_CHAR] = "Hello World!";
	char str2[MAX_CHAR] = "Nothing is impossible";

	printf("Before copying...\n");
	printf("str1: %s\n",str1);
	printf("str2: %s\n",str2);

	//copying all bytes of str2 to str1
	memcpy(str1, str2, strlen(str2));

	printf("After copying...\n");
	printf("str1: %s\n", str1);
	printf("str2: %s\n", str2);
	
	return 0;
}

Output

Before copying...
str1: Hello World!
str2: Nothing is impossible
After copying...
str1: Nothing is impossible
str2: Nothing is impossible

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