Answer 1

/* u forgot & in scanf
and it's \n (backslash)
Solution:- */
#include <stdio.h>
#include <stdlib.h>

int main()
{
int mon_val,hun,fifty,extra_val,ten,five,two,one;
printf("Please enter any number and see the magic ?\n");
scanf("%d",&mon_val);
extra_val=(mon_val-hun*100);
hun=mon_val/100;
fifty=extra_val/50;
ten=(extra_val-50)/10;
five=((extra_val-50)-(ten*10))/5;
two=((extra_val-50)-(ten*10))/2;
one=((extra_val-50)-(ten*10))/1;
printf("The number of hundred bills needed is %d\n ",hun);
printf("The number of fifty bills needed is %d\n ",fifty);
printf("The number of tens bills needed is %d\n ",ten);
printf("The number of five bills needed is %d\n ",five);
printf("The number of two bills needed is %d\n ",two);
printf("The number of ones bills needed is %d\n ",one);
return 0;
}