C/string.h/memset

    

//Declaration:  void *memset(void *buf, int ch, size_t count); 
//Return:       returns buf. 
  

#include <string.h>
#include <stdio.h>
int main(void){
  char buf[100];
  memset(buf, "\0", 100);
  memset(buf, "X", 10);
  printf(buf);
}
         
/*
XXXXXXXXXX
*/