循环语句 | 循环运算

求一个以二为底的对数
毕竟它是循环/2，所以我们可以这样写。

#include <stdio.h>
int main() {
    int x, rate = 0;
    scanf("%d", &x);
    int t = x;    // 我们要保存一下x的原始值
    while (x>1) {
        x /= 2;
        rate++;

    }
    printf("log 2 of %d is %d", t, rate);
    return 0;
}        

求平均数

#include <stdio.h>
int main() {
    int sum = 0, count = 0, number;
    float average;
    while ( number != -1) {
        sum += number;
        count++;
        scanf("%d", &number);
    }
    average = 1.0 * sum / count;
    printf("平均数为%.2f", average);
    return 0;
}

算位数

#include <stdio.h>
 int main () {
     int num;
     scanf("%d",&num);
     int i = 0;
     do {
        num /= 10;
        i++;
     } while ( num > 0 );
     printf("是%d位数",i);
     return 0;
 }