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와! 4강! #10

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1770e5d
chapter02 과제 수행
Turtle-Hwan Jun 23, 2021
17f4e8a
chapter01 사진 추가
Turtle-Hwan Jun 23, 2021
7b00df2
chapter03 과제 수행
Turtle-Hwan Jun 28, 2021
3a2297e
chapter03 과제 수행
Turtle-Hwan Sep 12, 2021
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Binary file added Turtle-hwan/chapter01/chapter01_wsl환경구축.png
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Binary file added Turtle-hwan/chapter02/chapter02_자료형.png
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23 changes: 23 additions & 0 deletions Turtle-hwan/chapter02/variables.c
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#include <stdio.h>

void main() {
int example = 78;
// 서로 다른 자료형의 변수 3개 이상 선언 및 초기화

char example_char = 'A'; //문자형 변수 1byte / %c로 출력 / 정수로 출력하려면 %hhd

float example_float = 2.71828182846; //4byle 단일 정밀도

double example_double = 2.71828182846; //8byte 두배정밀도 실수 표현 / scanf 시는 double 형은 %lf로 받아야 함.



printf("%d\n", example);
// 앞서 선언한 모든 변수를 한 줄에 하나씩 출력
printf("문자 출력 : %c | 정수 출력 : %hhd\n", example_char, example_char);

printf("float 표현 %%1.16f 출력: %1.16f | %%f 출력: %f\n", example_float, example_float);
//float 형식은 double 보다 부정확
printf("double 표현 %%1.16f 출력: %1.16f | %%f 출력: %f\n", example_double, example_double);
//%f로 출력하면 float이 정확하게 표시할 수 있는 한계만큼 (소수점 아래 6자리 정도) 표현?!
}
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88 changes: 88 additions & 0 deletions Turtle-hwan/chapter03/operator.c
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#include <stdio.h>


void printBin_dec(int dec) { //십진수를 이진수로 바꾸어 출력
int d;
if (dec >= 0) {
d = dec;
}
else {
d = -dec;
}
int bin[32] = {0,};
int idx = 31;
while (d >= 2 && idx != 0) {
bin[idx] = d % 2;
idx--;
d = d / 2;
}
bin[idx] = 1;

if (dec < 0) { //2진법 음수 처리 -> 2의 보수 표현 // 2의 보수 : 1의 보수 + 1
for (int i = 31; i >= 0; i--) { //1의 보수
if (bin[i] == 1) {
bin[i] = 0;
}
else {
bin[i] = 1;
}
}
if (bin[31] == 1) { // + 1 처리
for (int i = 31; i >= 0; i--) {
if (bin[i] == 1) {
bin[i] = 0;
continue;
}
else {
bin[i] = 1;
break;
}
}
}
else {
bin[31] = 1;
}
}


//출력 부분 4자리씩 끊어서
printf("%d를 이진수로 바꾼 결과입니다.\n", dec);
for (int i = 0; i < 32; i++) {
printf("%d", bin[i]);
if (i % 4 == 3) {
printf(" ");
}
}
printf("\n");
}

void main() {
//int dec = 0b101111;
int dec1, dec2;

printf("연산할 첫 번째 십진수 입력 : ");
scanf("%d", &dec1);
printf("연산할 두 번째 십진수 입력 : ");
scanf("%d", &dec2);

printBin_dec(dec1);
printBin_dec(dec2);

printf("\n[비트 연산]\n");
printf("\n%d & %d = %d\n", dec1, dec2, dec1 & dec2);
printBin_dec(dec1 & dec2);

printf("\n%d | %d = %d\n", dec1, dec2, dec1 | dec2);
printBin_dec(dec1 | dec2);

printf("\n%d ^ %d = %d\n", dec1, dec2, dec1 ^ dec2);
printBin_dec(dec1 ^ dec2);

printf("\n~%d = %d\n", dec1, ~dec1);
printBin_dec(~dec1);

printf("\n%d << 3 = %d\n", dec1, dec1 << 3);
printBin_dec(dec1 << 3);

printf("\nsize of int : %ld byte\n", sizeof(dec1));
}
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38 changes: 38 additions & 0 deletions Turtle-hwan/chapter04/printGrade_switch.c
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#include <stdio.h>

void main() {
int score;
printf("점수 입력 : ");
scanf("%d", &score);

switch ((score*2)/10) {
case 20:
case 19:
printf("%d는 A+ 입니다.\n", score);
break;
case 18:
printf("%d는 A 입니다.\n", score);
break;
case 17:
printf("%d는 B+ 입니다.\n", score);
break;
case 16:
printf("%d는 B 입니다.\n", score);
break;
case 15:
printf("%d는 C+ 입니다.\n", score);
break;
case 14:
printf("%d는 C 입니다.\n", score);
break;
case 13:
printf("%d는 D+ 입니다.\n", score);
break;
case 12:
printf("%d는 D 입니다.\n", score);
break;
default:
printf("%d는 F 입니다.\n", score);
break;
}
}