unsigned long十进制转换为十六进制只用putchar输出

#include <stdio.h>

#include <stdlib.h>

void ten_to_sixteen(long s)

{

int i,j;

long a,m,p,c,b[10];

a=m=s;

for( j=1; ;j++ )

{

p=m/16;

m=p;

if( p==0 )

{

break;

}

}

for( i=0;i<j;i++ )

{

c=a%16;

b[i]=c;

a=a/16;

}

printf( "转换的十六进制数结果：" );

putchar('0');

putchar('x');

j--;

for(;j>=0;j--)

{

switch(b[j])

{

case 0:

putchar('0');

break;

case 1:

putchar('1');

break;

case 2:

putchar('2');

break;

case 3:

putchar('3');

break;

case 4:

putchar('4');

break;

case 5:

putchar('5');

break;

case 6:

putchar('6');

break;

case 7:

putchar('7');

break;

case 8:

putchar('8');

break;

case 9:

putchar('9');

break;

case 10:

putchar('A');

break;

case 11:

putchar('B');

break;

case 12:

putchar('C');

break;

case 13:

putchar('D');

break;

case 14:

putchar('E');

break;

case 15:

putchar('F');

break;

default:

break;

}

}

}

int main()

{

long num;

printf( "请输入要转换的十进制数：" );

scanf("%ld",&num);

ten_to_sixteen(num);

printf( "\n" );

return 0;

}