#include "stdio.h"
#include "stdlib.h"
int main()
{
int a
= 0, count
= 0;
for (a
= 0; a
<= 100; ++a
)
{
if (a
< 10 && a
== 9)
{
++count
;
}
else
{
if (a
/10 == 9) ++count
;
if (a
%10 == 9) ++count
;
}
}
printf("1-100内的整数出现了%d次数字9\n",count
);
system("pause");
return 0;
}
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