1.题目:通过编程实现,统计1~n有多少个9 提示:n通过参数传入

#include <stdio.h>void fun(int n){int i;int temp;int count = 0;int b;for(i = 1;i <= n;i++){temp = i;while(temp != 0){b=temp % 10;temp=temp / 10;if(b == 9){count++;}}}printf("The result is:%d\n",count);}int main(){int n;printf("Enter a number!\n");scanf("%d",&n);fun(n);    return 0;}