有下列程序
#include
main()
{ int i,j=0;
char a[]="ab123c4d56ef7gh89 ",b[100];
for(i=0; a[i]; i++)
if(!(a[i] >= ''a'' && a[i]<= ''z ''))
b[j++] = a[i];
for(i=0; a[i]; i++)
if(!(a[i] >= ''0 '' && a[i] <= ''9 ''))
b[j++] = a[i];
b[j] = ''\0 '';
printf ("%s ",b);
}
程序执行后的输出结果是______。