C language macro define command exercise

Study C Language macro #define command . 

Their thinking ：C In language , It can be used #define Define an identifier to represent a constant .

Its characteristics are ： The defined identifier does not occupy memory , It's just a temporary symbol , After the precompile, the symbol does not exist ; Precompiling is also called preprocessing , Precompiling is not compiling , But pre compilation processing , This operation is automatically completed by the system before formal compilation .

C Language source code demonstration ：

#include<stdio.h>// The header file
#define TRUE 1// Macro variable
#define SQUARE(x) (x)*(x)// Macro definition squared function
int main()// The main function
{
  int num,num_Square;// Defining integer variables
  printf(" Please enter the number of squares required ：");// Prompt statement
  scanf("%d",&num);// Keyboard entry
  num_Square=SQUARE(num);// Find the square
  printf("%d The square is ：%d\n",num,num_Square);// Output results
  if(num_Square>50)
  {
    printf("%d\n",TRUE);
  }
  return 0;// The return value of the function is 0
}

Compile run results ：

Please enter the number of squares required ：8
8 The square is ：64
1

--------------------------------
Process exited after 3.367 seconds with return value 0
Please press any key to continue . . .

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