Algorithmic competition Getting Started classic exercise 3-5 3-6 binary conversion

Exercise 3-6

Enter cardinality B (2<=b<=10) and positive integer n (decimal), and the B-binary representation of the output n.

#include <stdio.h> #include <stdlib.h> #define MAXN 100int a[maxn];int Main (int argc, char *argv[]) {  int b , n, i = 0, J;  scanf ("%d%d", &b, &n);  while (n/b! = 0 | | n%b! = 0)  {     a[i++] = n%b;     n = n/b;  }  for (j = i-1; J >= 0; j--)     printf ("%d", a[j]);  printf ("\ n");  System ("PAUSE");  return 0;}

Summary: N>0 can be used as a condition for judging

Exercise 3-7

Enter cardinality B (2<=b<=10) and positive integer n (b-binary), and the decimal representation of the output n.

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <math.h> #define MAXN 100char a[maxn];int Main (int argc, char *argv[]) {  int b, Length, I, J;  int n = 0;  scanf ("%d", &b);  scanf ("%s", a);  Length = strlen (a);  for (i = length-1, j = 0; I >= 0; I--, j + +)  {     n = n + (a[i]-' 0 ') *pow (b,j);  }  printf ("%d\n", n);  System ("PAUSE");  return 0;}

Algorithmic competition Getting Started classic exercise 3-5 3-6 binary conversion