#include<stdio.h>
#include<math.h>
 
struct Body{
    int id;
    double height;
    double weight;
    double bmi;
};
 
int main(void)
{
    struct Body data[] = { { 1, 170, 60 },
                           { 2, 150, 50 },
                           { 3, 160, 56 },
                           { 4, 180, 70 } };
 
    for(int i=0; i<4; i++){
        data[i].bmi = data[i].weight / (data[i].height/100) / (data[i].height/100);
        printf( "id %d : %.1f\n", data[i].id, data[i].bmi );
    }
 
    return 0;
}

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