题解 | #求小球落地5次后所经历的路程和第5次反弹的高度#

#include <stdio.h>
#include <math.h>
#include <string.h>
int main() {
    int n = 0;
    float nf = 0;
    scanf("%d",&n);
    nf = (float) n;
    float len = nf *(pow(0.5, 0) + 2*pow(0.5, 1) + 2*pow(0.5, 2) + 2*pow(0.5, 3) + 2*pow(0.5, 4));
    float hf = nf*pow(0.5,5);
    char hfstr[16] = {0};
    int hfstrLen = 0;
    sprintf(hfstr, "%f", len);
    hfstrLen = strlen(hfstr);
    for(int i = hfstrLen; i >0; i--)
    {
        if('0' == hfstr[i-1])
            hfstr[i-1] = 0;
        else
          break;
    }

    printf("%s\n%1.5f",hfstr,hf);
    return 0;
}