计算在区间1到n的所有整数中,数字x(0<x<9)出现的次数?例如在1到11中,1出现了4次。
#include<stdio.h> #include<stdlib.h> int CountX(int n,int x) { int yushu,res; int count = 0; if(n == 0 && x == 0) { count = 1; } else if(n == 0 && x != 0) { count = 0; } else { yushu = n%10; res = n/10; if(yushu == x) count++; while(res) { yushu = res % 10; if(yushu == x) count++; res = res / 10; } } return count; } int main() { int n,x; scanf("%d%d",&n,&x); int count = 0,i; for(i=1;i<=n;i++) { count+=CountX(i,x); } printf("%d",count); return 0; }