making the value of a variable to its 10 times

#include <stdio.h>

void change_val(int *x);

int main(){

int a=10;

printf("The value of a before change fucntions is:%d\n",a);

change_val(&a);

printf("The value of a before change fucntions is:%d\n",a);

 return 0;

}

void change_val(int *x)

{

    *x=(*x)*10;

}