Collatz/Hailstone sequence

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#include<stdio.h> int main() { int a; printf("ENTER A POSITIVE NUMBER:"); scanf("%d",&a); printf("Collatz/Hailstone Sequence For This Number:\n\n"); printf("%d",a); while(a!=1) { if(a%2==0){ a=a/2; } else { a=3*a+1; } printf(",%d",a); } getch(); return 0; }