Initial commit: C language learning code

2025-07-20 16:30:56 +08:00
commit 06e24173a6
139 changed files with 9303 additions and 0 deletions
@@ -0,0 +1,63 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <math.h>
+
+int is_sushu(int x)     //判断一个数是否是素数
+{
+    if (x <= 1)
+        return 0;
+    for (int a = 2; a <= sqrt(x); a++)
+    {
+        if (x % a == 0)
+        {
+            return 0;
+        }
+    }
+    return 1;
+}
+
+int num_sushuhe(int x, int y)   //计算区间[x,y]内素数的和
+{
+    int sum = 0;
+    for (int e = x; e <= y; e++)
+    {
+        if (is_sushu(e))
+        {
+            sum += e;
+        }
+    }
+    return sum;
+}
+
+int main()
+{
+    int m, n;
+    printf("请输入两个正整数m和n:");
+    scanf("%d %d", &m, &n);
+
+    if (n > m)  // 确保m <= n
+    {
+        int temp = m;
+        m = n;
+        n = temp;
+    }
+
+    if (n < 1 || m < 1)
+    {
+        printf("输入错误，请重新输入！\n");
+    }
+    else
+    {
+        printf("素数列表: ");
+        for (int x = n; x <= m; x++)
+        {
+            if (is_sushu(x))
+            {
+                printf("%d ", x);
+            }
+        }
+        printf("\n素数和: %d\n", num_sushuhe(n, m));
+    }
+    return 0;
+}