8-2-1.c

2005软件工程师考试下午编程题源代码

/*中国系统分析员顾问团，http://www.csai.cn*/
/*程序员下午考试指南书籍源码*/

#include <stdio.h>

void parse_sort( int num,int *each ){
int i,*j,*k,temp;
for ( i=0; i<4; i++ ){
j = each+3-i;
*j = num%10;
num = num/10;
}
for ( i=0; i<3; i++ )
for ( j=each,k=each+1; j<each+3-i; j++, k++ ){
if ( *j>*k ){
temp = *j; *j = *k; *k = temp;
}
}
return;
}

void max_min( int *each, int *max, int *min ){
int *i;
*min = 0;
for ( i=each; i<each+4; i++ )
*min = *min*10+*i;
*max = 0;
for ( i=each+3; i>=each; i-- )
*max =*max*10+*i;
return;
}

void vr6174 (int num){
int each[4],max,min;
if ( num != 6174 && num ){
parse_sort( num,each );
max_min( each, &max, &min);
num = max-min;
printf( "%d-%d=%d\n",max,min,num );
vr6174( num );
}
else printf( "\n" );
return;
}

main(){
int temp=5346;
vr6174(temp);	
	
	}