이것이 c언어다. 17장 피트니스회원

회원별 몸무게와 이름, 회원번호를 저장하고 평균값과 최대값 구하기. 회원수는 제한 없음.

#include <stdio.h>

#include <stdlib.h>

typedef struct

{

    int num;

    char name[20];

    double weight;

}Fitness;

double averageWeight(Fitness *pstList, int cnt);

int maxWeight(Fitness *pstList, int cnt);

void printInfo(Fitness *pstList, int mc);

void freeAty(Fitness *pstList, int cnt);

int main(void)

{

    int nSize = 2;

    static int sNIndex = 0;

    int nMaxCount = 0;

    double avg;

    Fitness stListTemp;               //임시list

    Fitness* pstList;       //동적할당 받을 list

    pstList = (Fitness*)malloc(sizeof(Fitness)*nSize);

    do

    {

        if(sNIndex  >= nSize)

        {

            nSize = nSize + 2;

            pstList = (Fitness*)realloc(pstList,nSize*sizeof(Fitness));

        }

        else

        {

            printf("User Number : %d\n",sNIndex+1);

            stListTemp.num = sNIndex;  

            fflush(stdin);

            printf("User Name : ");

            gets(stListTemp.name); 

            printf("enter the weight : ");

            scanf("%lf",&(stListTemp.weight));

            pstList[sNIndex] = stListTemp;   

            fflush(stdin);

            sNIndex++;

            printf("Anymore?(Y/N)");

        }

    }while(getchar() != 'N');

    printf("#total user : %d\n",sNIndex);

    avg = averageWeight(pstList,sNIndex);  

    printf("#average of weight : %.2f\n",avg);

    printf("the best pig!! : \n");

    nMaxCount = maxWeight(pstList,sNIndex);   

    printInfo(pstList,nMaxCount);

    return 0;

}

double averageWeight(Fitness *pstList, int cnt)

{

    int i;

    double total_weight = 0.0;

    for(i=0;i<=cnt;i++)

    {

        total_weight = total_weight + pstList[i].weight;

         //무게 총합 확인. 확인후 지우기

    }

    printf("total_weight : %.2f \n",total_weight);

    return total_weight / cnt;

}

int maxWeight(Fitness *pstList, int cnt)

{

    int i;

    int k = 0;

    double max = pstList[0].weight; //최대값 초기화

    for(i=1;i<cnt;i++)

    {

        if(max < pstList[i].weight)

        {

            max = pstList[i].weight;

            k = i;

        }

    }

    return k;

}

void printInfo(Fitness *pstList, int nMaxCount)

{

    printf("Number : %d\n",pstList[nMaxCount].num);

    printf("Name : %s\n",pstList[nMaxCount].name);

    printf("Weight : %.2lf\n",pstList[nMaxCount].weight);

}

void freeAty(Fitness *pstList, int sNIndex)

{

    int i;

    for(i=0;i<sNIndex;i++)

    {

        free(pstList);

    }

}