인프런 커뮤니티 질문&답변

1차원 배열 각각을 2차원 배열에 포인터를 사용해서 값을 추가해주었습니다.

#define CRTSECURE_NO_WARNINGS

#include <stdio.h>

#define MONTH 12

#define YEARS 3

int main()

{

double year2022[MONTH] = { -2.2, -1.1, 7.7, 14.8, 19.1, 23.3, 27.3, 25.7, 22.4, 14.6, 10, -2.8 };

double year2023[MONTH] = { -1.5, 2.3, 9.8, 13.8, 19.5, 23.4, 26.7, 27.2, 23.7, 15.8, 6.8, 1.1 };

double year2024[MONTH] = { -0.5, 3.8, 7, 16.3, 18.5, 24.6, 26.6, 29.3, 25.5, 16.7, 9.7, 0.8 };

/*

1. Use 2D array

2. Print data

3. Calculate and print yearly average temperatures of 3 years

4. Calculate and print monthly average temperatures for 3 years

*/

double temperatures[YEARS][MONTH];

double* ptr[3] = { &year2022, &year2023, &year2024 };

for (int i = 0; i < YEARS; i++)

{

for (int j = 0; j < MONTH; j++)

{

temperatures[i][j] = *(ptr[i] + j);

}

}

printf("[Temperature Data]\n");

for (int i = 0; i <= MONTH; i++)

{

if (i == 0)

{

printf("Your index :\t");

continue;

}

printf("%d\t", i);

}

printf("\n");

for (int i = 0; i < YEARS; i++)

{

for (int j = 0; j < MONTH; j++)

{

if (j == 0)

{

printf("Year %d :\t", i);

}

printf("%.1f\t", temperatures[i][j]);

}

printf("\n");

}

printf("\n");

double sum = 0.0;

printf("[Yearly average temperature of 3 years]\n");

for (int i = 0; i < YEARS; i++)

{

sum = 0.0;

printf("Year %d : ", i);

for (int j = 0; j < MONTH; j++)

{

sum += *(ptr[i] + j);

}

printf("average temperature = %.1f\n", sum / MONTH);

}

printf("\n");

printf("[Monthly average temperatures for 3 years]\n");

for (int i = 0; i <= MONTH; i++)

{

if (i == 0)

{

printf("Your index :\t");

continue;

}

printf("%d\t", i);

}

printf("\n");

printf("Avg Temps :\t");

for (int i = 0; i < MONTH; i++)

{

sum = 0.0;

for (int j = 0; j < YEARS; j++)

{

sum += temperatures[j][i];

}

printf("%.1f\t", sum / YEARS);

}

return 0;

}