Initial commit: C language learning code

翁凯C语言/2/正序整数分解4.c

@@ -0,0 +1,62 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <math.h>
+
+int num_weishu(int num) //判断数字位数
+{
+	int n = 0;
+	num = abs(num);
+	if (num == 0)
+	{
+		return 1;
+	}          
+	while (num > 0)
+	{
+		num /= 10;
+		n++;
+	}
+	return n;
+}
+
+int main()
+{
+	int x;
+	int a=0;
+	int b=0;
+	int m=0;
+    printf("请输入一个整数：");
+    scanf("%d", &x);
+
+	a = num_weishu(x);
+	b = (int)(pow(10,a-1)+0.1);		//pow函数是次方运算的函数名,+0.1是为了避免浮点数误差
+	printf("这个数字的位数是%d。\n", a);
+
+	if(a>9)
+	{
+		printf("超过最大支持位数！\n");
+		return -1;
+	}
+	else
+	{
+		
+		if (x<0) 	// 处理负号
+		{
+			printf("-");
+		}	
+		while (b>0)
+		{
+			m = x/b;
+			printf("%d", m);
+			if (b>9)
+			{
+				printf(" ");
+			}
+			x = x%b;
+			b = b/10;
+		} 
+		printf("\n");
+	}
+
+	return 0;
+}