Initial commit: C language learning code

翁凯C语言/4/函数求和.c

@@ -0,0 +1,25 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <math.h>
+#include <stdbool.h>
+
+int num_sum(int a, int b)   // 函数定义
+{
+    int sum = 0;
+    for (int i = a; i <= b;i++)
+    {
+        sum += i;
+    }
+    return sum;
+}
+
+int main()
+{
+    int a, b;
+    printf("请输入两个整数：");
+    scanf("%d %d", &a, &b);
+    printf("%d和%d之间的所有数的和：sum = %d\n", a, b, num_sum(a, b));
+
+    return 0;
+}