個人第一個C程序

 1 //
 2 //  main.c
 3 //  one
 4 //
 5 //  Created by Shuang Gai on 2019/1/19.
 6 //  Copyright © 2019 Shuang Gai. All rights reserved.
 7 //
 8 
 9 #include <stdio.h>
10 #include <stdlib.h>
11 
12 #define PI 3.1415926
13 
14 void input_value(void);
15 float num;
16 
17 int main() {
18     input_value();
19     printf("AGE is %f \n",PI*num*num);
20     return 0;
21 }
22 
23 
24 void input_value()
25 {
26     printf("input your number: \n");
27     scanf("%f",&num);
28     
29 }

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