【实践课内】6.循环结构3/7-1 求简单交错序列前N项和.c

@@ -1,20 +0,0 @@
-#include <stdio.h>
-
-int main() {
-    int n;
-    double ans = 0;
-
-    scanf("%d", &n);
-
-    for (int i = 0; i < n; i++) {
-        if (i % 2 == 0) {
-            ans += 1.0 / (1 + 3 * i);
-        } else {
-            ans -= 1.0 / (1 + 3 * i);
-        }
-    }
-
-    printf("sum = %.3lf\n", ans);
-
-    return 0;
-}

【实践课内】6.循环结构3/7-2 21循环-求和2.c

@@ -1,22 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-
-int main() {
-    long long n, ans = 0;
-
-    scanf("%lld", &n);
-
-    for (long long i = 1; i <= (long long)sqrt(n); i++) {
-        if (n % i == 0) {
-            ans += i;
-
-            if (i != n / i) {
-                ans += n / i;
-            }
-        }
-    }
-
-    printf("%lld\n", ans);
-
-    return 0;
-}

【实践课内】6.循环结构3/7-3 个位数.c

@@ -1,22 +0,0 @@
-#include <stdio.h>
-
-int main() {
-    int n;
-
-    scanf("%d", &n);
-
-    while (n >= 10) {
-        int s = 0;
-
-        while (n) {
-            s += n % 10;
-            n /= 10;
-        }
-
-        n = s;
-    }
-
-    printf("%d\n", n);
-
-    return 0;
-}

【实践课内】6.循环结构3/7-4 循环-分数矩阵.c

@@ -1,34 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-
-int main() {
-    int n;
-
-    while (scanf("%d", &n) != EOF, n != 0) {
-        double ans = n;
-
-        for (int i = 2; i <= n; i++) {
-            ans += (double)(n * 2 - 2 * (i - 1)) / (double)i;
-        }
-
-        /*
-        for (int i = 1; i <= n; i++) {
-            // 对角线左侧
-            for (int j = i; j >= 2; j--) {
-                ans += 1.0 / j;
-            }
-
-            ans += 1;
-
-            // 对角线右侧
-            for (int j = 2; j <= n - i + 1; j++) {
-                ans += 1.0 / j;
-            }
-        }
-        */
-
-        printf("%.2lf\n", ans);
-    }
-
-    return 0;
-}

【额外练习】选择结构/7-33 选择-三数排序.c

@@ -1,29 +0,0 @@
-#include <stdio.h>
-
-int main() {
-    int a, b, c;
-
-    scanf("%d%d%d", &a, &b, &c);
-
-    if (a > b) {
-        int temp = a;
-        a = b;
-        b = temp;
-    }
-
-    if (a > c) {
-        int temp = a;
-        a = c;
-        c = temp;
-    }
-
-    if (b > c) {
-        int temp = b;
-        b = c;
-        c = temp;
-    }
-
-    printf("%d %d %d\n", a, b, c);
-
-    return 0;
-}

【额外练习】选择结构/7-34 选择-凯撒密码.c

@@ -1,19 +0,0 @@
-#include <stdio.h>
-
-int main() {
-    char c;
-
-    scanf("%c", &c);
-
-    if (c >= 'a' && c <= 'z') {
-        c += 3;
-        if (c > 'z') c -= 26;
-    } else if (c >= 'A' && c <= 'Z') {
-        c += 3;
-        if (c > 'Z') c -= 26;
-    }
-
-    printf("%c\n", c);
-
-    return 0;
-}

【额外练习】选择结构/7-35 选择-简单的运算Ⅱ.c

@@ -1,27 +0,0 @@
-#include <stdio.h>
-
-int main() {
-    double a, b, c;
-
-    scanf("%lf%lf%lf", &a, &b, &c);
-
-    if (a == 0) {
-        if (b == 0 && c != 0) {
-            printf("0\n");
-        } else {
-            printf("1\n");
-        }
-    } else {
-        double delta = b * b - 4 * a * c;
-
-        if (delta > 0) {
-            printf("2\n");
-        } else if (delta == 0) {
-            printf("1\n");
-        } else {
-            printf("0\n");
-        }
-    }
-
-    return 0;
-}

【额外练习】选择结构/7-36 选择-三角形和圆.c

@@ -1,26 +0,0 @@
-#include <math.h>
-#include <stdio.h>
-
-int main() {
-    double a, b, c, r;
-
-    scanf("%lf%lf%lf%lf", &a, &b, &c, &r);
-
-    double s = (a + b + c) / 2.0;
-
-    if (s <= a || s <= b || s <= c) {
-        printf("No\n");
-        return 0;
-    }
-
-    double area = sqrt(s * (s - a) * (s - b) * (s - c));
-    double inRadius = area / s;
-
-    if (r <= inRadius) {
-        printf("Yes\n");
-    } else {
-        printf("No\n");
-    }
-
-    return 0;
-}

【额外练习】选择结构/7-38 选择-百分制转五分制.c

@@ -1,23 +0,0 @@
-#include <stdio.h>
-
-int main() {
-    int t;
-
-    scanf("%d", &t);
-
-    if (t >= 90 && t <= 100) {
-        printf("A\n");
-    } else if (t >= 80 && t <= 89) {
-        printf("B\n");
-    } else if (t >= 70 && t <= 79) {
-        printf("C\n");
-    } else if (t >= 60 && t <= 69) {
-        printf("D\n");
-    } else if (t >= 0 && t <= 59) {
-        printf("E\n");
-    } else {
-        printf("Score is error!\n");
-    }
-
-    return 0;
-}