day4

Simplify the previous functions with macros ^-^

#include <stdio.h>

#include <stdlib.h>

#define MAX(X,Y) (X>Y?X:Y)

int main(int argc, char *argv[]) {

int a;

int b;

printf(" Enter the two numbers you want to compare :>\n");

scanf("%d\n%d",&a,&b);

int max = MAX(a,b);

printf(" Larger value :%d",max);

return 0;

}

The first day of touching the pointer ：（

int main()

{

int a = 10;

int* b = &a;

printf("%p\n",b);

*b = 2*a;

printf("%d",a);

return 0;

}

External functions are referenced （ It's unnecessary to write something by yourself , ha-ha ）

int b;

extern test();

int main(int argc, char *argv[])  

{

 

int i = 0;

while (i<5)

{

 b = test();

 printf("%d\n",b);

 i++;

}

return 0;

}

External function ：

int test()

{

static int a = 1;

a++;

return a;

}