第五课。

05/01.drawio

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05/02.drawio

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+<mxfile host="app.diagrams.net" modified="2022-10-14T14:43:46.434Z" agent="5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/106.0.0.0 Safari/537.36" etag="E9APwlGWJnjDO3wkaXUL" version="20.4.1" type="device"><diagram id="aVX7Rt8ogbojC2gi6nuN" name="第1頁">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</diagram></mxfile>

05/Exercise01.c

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+#include <stdio.h>
+
+void decideShape(int max, int small_1, int small_2) {
+    if (small_1 + small_2 > max) {
+        if (small_1 == small_2) {
+            if (small_1 == max) {
+                printf("Equilateral triangle");
+            }
+            else {
+                printf("Isosceles triangle");
+            }
+        }
+        else {
+            printf("Triangle");
+        }
+    }
+    else {
+        printf("Not a triangle");
+    }
+}
+
+int main() {
+    int a = 0, b = 0, c = 0;
+    scanf("%d %d %d", &a, &b, &c);
+    if (a > c) {
+        if (a > b) {
+            decideShape(a, b, c);
+        }
+        else {
+            decideShape(b, a, c);
+        }
+    }
+    else {
+        if (c > b) {
+            decideShape(c, a, b);
+        }
+        else {
+            decideShape(b, a, c);
+        }
+    }
+    return 0;
+}

05/Exercise02.c

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+#include <stdio.h>
+
+int main() {
+    char operater;
+    int a = 0, b = 0, c = 0, d = 0;
+    double result;
+    scanf("%c %d %d %d %d", &operater, &a, &b, &c, &d);
+    if (b == 0 || d == 0 || (operater == '/' && c == 0)) {
+        printf("input error");
+    }
+    else {
+        switch (operater) {
+            case '+': result = (a/b)+(c/d); break;
+            case '-': result = (a/b)-(c/d); break;
+            case '*': result = (a/b)*(c/d); break;
+            case '/': result = (a/b)/(c/d); break;
+        }
+        printf("%lf", result);
+    }
+    return 0;
+}

05/Exercise03.c

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+#include <stdio.h>
+
+int main() {
+    int input = 0;
+    int digit = 0;
+    int digits[5] = {0};
+    scanf("%d", &input);
+    while (input != 0) {
+        digits[digit] = input % 10;
+        input /= 10;
+        digit++;
+    }
+    printf("This number has %d digit(s).\n", digit);
+    printf("To print every digit in a seperate line:\n");
+    for (int i = digit - 1; i >= 0; i--) {
+        printf("%d\n", digits[i]);
+    }
+    printf("To output it reversely: ");
+    for (int i = 0; i < digit; i++) {
+        printf("%d", digits[i]);
+    }
+    return 0;
+}

05/Optional01.c

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+#include <stdio.h>
+
+void speakOut(int num) {
+    switch (num) {
+        case 0: printf("zero"); break;
+        case 1: printf("one"); break;
+        case 2: printf("two"); break;
+        case 3: printf("three"); break;
+        case 4: printf("four"); break;
+        case 5: printf("five"); break;
+        case 6: printf("six"); break;
+        case 7: printf("seven"); break;
+        case 8: printf("eight"); break;
+        case 9: printf("nine"); break;
+        case 10: printf("ten"); break;
+        case 11: printf("eleven"); break;
+        case 12: printf("twelve"); break;
+        case 13: printf("thirteen"); break;
+        case 14: printf("fourteen"); break;
+        case 15: printf("fifteen"); break;
+        case 16: printf("sixteen"); break;
+        case 17: printf("seventeen"); break;
+        case 18: printf("eighteen"); break;
+        case 19: printf("nineteen"); break;
+        case 20: printf("twenty"); break;
+        case 30: printf("thirty"); break;
+        case 40: printf("forty"); break;
+        case 50: printf("fifty"); break;
+        default: speakOut(num / 10 * 10); printf(" "); speakOut(num % 10);
+    }
+}
+
+int main() {
+    int hr, min;
+    scanf("%d %d" , &hr, &min);
+    speakOut(hr);
+    printf(" ");
+    if (min == 0) {
+        printf("o'clock");
+    }
+    else {
+        speakOut(min);
+    }
+    return 0;
+}

05/Optional02.c

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+#include <stdio.h>
+
+int inCircle(int centerX, int centerY, int posX, int posY) {
+    int x_distance = 0, y_distance = 0;
+    x_distance = centerX - posX;
+    y_distance = centerY - posY;
+    if (x_distance * x_distance + y_distance * y_distance <= 1) {
+        return 1;
+    }
+    else {
+        return 0;
+    }
+}
+
+int main() {
+    int pos_x = 0 , pos_y = 0;
+    scanf("%d %d", &pos_x, &pos_y);
+    if (inCircle(2, 2, pos_x, pos_y)) {
+        printf("10m");
+    }
+    else if (inCircle(-2, 2, pos_x, pos_y)) {
+        printf("9m");
+    }
+    else if (inCircle(-2, -2, pos_x, pos_y)) {
+        printf("8m");
+    }
+    else if (inCircle(2, -2, pos_x, pos_y)) {
+        printf("7m");
+    }
+    else {
+        printf("0m");
+    }
+    return 0;
+}

05/Optional03.c

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+#include <stdio.h>
+
+int main() {
+    int N = 0, count[3] = {0};
+    // Count[0] stores the number of occerence of 5, [1] counts for 6, [2] counts for 7
+    scanf("%d", &N);
+    while (N > 0) {
+        switch (N % 10) {
+            case 5: count[0]++; break;
+            case 6: count[1]++; break;
+            case 7: count[2]++; break;
+        }
+        N /= 10;
+    }
+    printf("%d %d %d", count[0], count[1], count[2]);
+    return 0;
+}