이것이 c언어다. 16장 기부금관리

이름과 기부금을 입력받고, 목록과 평균값 출력. 기부받는 사람수는 제한없음.

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

void print_str(char **pName, int *pDonation, int nCount);

int setAverage(int *pDonation, int nCount);

void free_(char (*pName)[], int *pDonation, int cnt);

int main(void)

{

    int nSize = 5;

    int nCount = 0;

    char (*pName)[10];

    int *pDonation;

    int i;

    int nAverage = 0;

    char szName[10];

    int donation;

    pName = (char (*)[10])malloc(sizeof(szName)*nSize);

    pDonation = (int *)malloc(sizeof(donation)*nSize);

    while(1)

    {

        if(nCount >= nSize )

        {

            nSize += 5;

            pName = (char (*)[10])realloc(pName,sizeof(szName)*nSize);

            pDonation = (int *)realloc(pDonation,sizeof(donation)*nSize);

        }

        else

        {

            printf("Name (EXIT : end) : ");

            gets(szName);

            if(strcmp(szName,"end") == 0)break;

            printf("Donation : ");

            scanf("%d",&donation);

            getchar();

            strcpy(pName[nCount],szName);

            pDonation[nCount] = donation;

            nCount++;

        }

    }

    //nCount 는 배열의 마지막인수보다 1 크다.

    nAverage = setAverage(pDonation, nCount);

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

    {

        printf("%d. %s : %d\n",i,pName[i],pDonation[i]);

    }

    printf("Average : %d\n",nAverage);

    free_(pName,pDonation,nCount);

    return 0;

}

void free_(char (*pName)[10], int *pDonation, int cnt)

{

    int i;

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

    {

        free(pName);

        free(pDonation);

    }

}

int setAverage(int *pDonation, int nCount)

{

    int nTotal = 0;

    int i;

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

    {

        nTotal = nTotal + pDonation[i];

    }

    return (int)(nTotal/nCount);

}