#include <stdio.h>
#include <math.h>
 
typedef struct{
	int id;
	int he;
	int we;
}body;
 
int main(void) {
 
	body data[]={{1,165,60},{2,170,68},{3,160,50},{4,180,75},{5,175,80}};
 
 
	for(int i=0;i<5;i++) {
		for(int j=i+1;j<5;j++) {
    		if(data[i].he > data[j].he) {
    			body tmp = data[i];
    			data[i] = data[j];
    			data[j] = tmp;
    			}
			}
		}
 
	for(int i=0;i<5;i++){
		printf("id %d: %dcm %dkg\n",data[i].id,data[i].he,data[i].we);
	}
	printf("\n下から3人の平均と標準偏差\n");
 
	double ave;
	ave=(data[2].he+data[3].he+data[4].he)/3;
	double std;
	std=sqrt( ((data[2].he-ave)*(data[2].he-ave)+(data[3].he-ave)*(data[3].he-ave)+(data[4].he-ave)*(data[4].he-ave) )/3 );
	printf("ave:%.1f\nstd:%.1f",ave,std);
	return 0;
}
 

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