새싹교실/2020/이찌반/전성수

Describe 새싹교실/2020/이찌반/전성수 here 약수의 합

1. include <stdio.h>
2. include <stdbool.h>
3. include <stdlib.h>

int solution(int n) {

   int answer = 0;
   for (int i = n; i > 0; i--) {
       if (n % i == 0) {
           answer += i;
       }
       else continue;
   }
   return answer;

}

하샤드수

1. include <stdio.h>
2. include <stdbool.h>
3. include <stdlib.h>

bool solution(int x) {

   bool answer = true;
   int sum = 0;
   while (1) {
       sum += x % 10;
       if (x / 10 < 10) {
           sum += x / 10;
           break;
       }
       else {
           x /= 10;
       }
   }
   if (x % sum == 0) answer = true;
   else  answer = false;

   return answer;

}

수박수박수 //하샤드 수

1. include <stdio.h>
2. include <stdbool.h>
3. include <stdlib.h>

bool solution(int x) {

   bool answer = true;
   int sum = 0;
   while (1) {
       sum += x % 10;
       if (x / 10 < 10) {
           sum += x / 10;
           break;
       }
       else {
           x /= 10;
       }
   }
   if (x % sum == 0) answer = true;
   else  answer = false;

   return answer;

}

두개 뽑아서 더하기

1. include <stdio.h>
2. include <stdbool.h>
3. include <stdlib.h>
4. define SWAP(a, b) {int t = a; a = b; b = t;}

int* solution(int numbers[], size_t numbers_len) {

   int length = 0;
   int* answer = (int*)malloc(sizeof(int) * 100);
   for (int i = 0; i < numbers_len - 1; i++) {
       for (int j = i + 1; j < numbers_len; j++) {
           int add = numbers[i] + numbers[j];
           int check = 1;
           for (int k = 0; k < length; k++) {
               if (answer[k] == add) check = 0;
           }
           if (check == 1) {
               answer[length] = add;
               length++;
           }
       }
   }
   for (int i = 0; i < length; i++) {
       for (int j = 0; j < length - 1; j++) {
           if (answer[j] > answerj + 1) SWAP(answer[j], answerj + 1);
       }
   }
   return answer;

}

- 별찍기 //별찍기

1. include <stdio.h>

int main(void) {

   int a;
   int b;
   scanf_s("%d %d", &a, &b);
   printf("%d\n", a + b);
   for (int i = 0; i < b; i++) {

       for (int j = 0; j < a; j++) {
           printf("*");
       }

       printf("\n");
   }
   return 0;

}

문자열 정렬

1. include <stdio.h>
2. include <stdbool.h>
3. include <stdlib.h>
4. include <string.h>
5. define SWAP(a,b) {int t = a;a = b;b = t;}

char* solution(const char* s) {

   int cnt = strlen(s);
   char* answer = (char*)malloc(sizeof(char) * cnt);
   for (int i = 0; i <= cnt; i++) {
       answer[i] = s[i];
   }
   for (int i = 0; i < cnt; i++) {
       for (int j = 0; j < cnt - 1; j++) {
           if (answer[j] <= answerj + 1) {
               SWAP(answer[j], answerj + 1);
           }
       }
   }
   return answer;

}

문자열을 정수로 바꾸기

1. include <stdio.h>
2. include <stdbool.h>
3. include <stdlib.h>

int solution(const char* s) {

   int answer = 0;
   answer = atoi(s);
   return answer;

}

문자열 다루기

1. include <stdio.h>
2. include <stdbool.h>
3. include <stdlib.h>
4. include <string.h>
5. include <ctype.h>

bool solution(const char* s) {

   bool answer = true;
   int count = strlen(s);

   for (int i = 0; i < count; i++) {
       if (isalpha(s[i])) {
           answer = false;
       }
   }
   if ((count == 4 || count == 6) != 1) {
       answer = false;
   }

   return answer;

}

두 정수 사이의 합

1. include <stdio.h>
2. include <stdbool.h>
3. include <stdlib.h>

long long solution(int a, int b) {

   long long answer = 0;
   long long sum = 0;
   if (a > b) {
       for (int i = b; i <= a; i++) {
           sum += i;
       }
       answer = sum;
   }
   else if (a < b) {
       for (int i = a; i <= b; i++) {
           sum += i;
       }
       answer = sum;
   }
   else {
       answer = a;
   }
   return answer;

}

가운데 글자 가져오기

1. include <stdio.h>
2. include <stdbool.h>
3. include <stdlib.h>
4. include <string.h>

char* solution(const char* s) {

   char* answer;
   int cnt = strlen(s);
   if (cnt % 2) {
       answer = (char*)malloc(sizeof(char));
       answer[0] = scnt / 2;
       answer[1] = '\0';
   }
   else {
       answer = (char*)malloc(sizeof(char) * 2);
       answer[0] = s(cnt / 2) - 1;
       answer[1] = scnt / 2;
       answer[2] = '\0';
   }
   return answer;

}

2016년

1. include <stdio.h>
2. include <stdbool.h>
3. include <stdlib.h>

//5. 24(1,2,3,4, char* solution(int a, int b) {

   // 리턴할 값은 메모리를 동적 할당해주세요.
   char* answer = (char*)malloc(sizeof(char) * 10);
   int day = b;
   int month[] = { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
   for (int i = 0; i < a; i++) {
       day += monthi - 1;
   }
   switch (day % 7) {
   case 0: answer = "THU"; break;
   case 1: answer = "FRI"; break;
   case 2: answer = "SAT"; break;
   case 3: answer = "SUN"; break;
   case 4: answer = "MON"; break;
   case 5: answer = "TUE"; break;
   case 6: answer = "WED"; break;
   }
   return answer;

}