第三章二十题

#include<stdio.h>void trans(int n,int base){ int a[10],i=0,k; if(base==2) { while (n != 0) {   a[i]= n%2;    n/=2; i++; } k=i; for(i=k-1;i>=0;i--)  printf("%d",a[i]); } if(base==8) { while (n != 0) {   a[i]= n%8;    n/=8; i++; } k=i; for(i=k-1;i>=0;i--)  printf("%d",a[i]); } if(base==16) { while (n != 0) {   a[i]= n%16;    n/=16; i++; } k=i; for(i=k-1;i>=0;i--)  {  if(a[i]>=0&&a[i]<=9)      printf("%d",a[i]); if(a[i]>=10&&a[i]<=15)  {  switch(a[i])  {  case 10: printf("A");break;  case 11: printf("B");break;  case 12: printf("C");break;  case 13: printf("D");break;  case 14: printf("E");break;  case 15: printf("F");break;  }  } } }}void main(){ int i,k; while(1) { printf("请输入一个数字："); scanf("%d", &i); printf("需要进制数（2?? 8?? 16??）"); scanf("%d",&k); printf("转化为%d进制为：",k); trans(i,k); printf("\n"); }}