C Reference String Operation: memset()

The function memset() copies x into a buffer y and does this n times.

Usage:

void *memset( void *y, int x, size_t n);

Note: memset can be used to set all values of an array to zero (very efficient!)

An example: memset( an_array, ‘\0′, sizeof_array)

memchr() source code example:


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

	main()
	{
		char line[100];
		strcpy(line, "aacc");

		memset(line,'b',2);
		printf("%s\n", line);
	}

Output of the example:


	bbcc

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