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else printf("\40: No such value.\n"); } ----------------------------------------------------------------------------- 【程序49】 题目：#if #ifdef和#ifndef的综合应用。 1. 程序分析： 2.程序源代码： #include "stdio.h" #define MAX #define MAXIMUM(x,y) (x>y)?x:y #define MINIMUM(x,y) (x>y)?y:x void main() { int a=10,b=20; #ifdef MAX printf("\40: The larger one is %d\n",MAXIMUM(a,b)); #else printf("\40: The lower one is %d\n",MINIMUM(a,b)); #endif #ifndef MIN printf("\40: The lower one is %d\n",MINIMUM(a,b)); #else printf("\40: The larger one is %d\n",MAXIMUM(a,b)); #endif #undef MAX #ifdef MAX printf("\40: The larger one is %d\n",MAXIMUM(a,b)); #else printf("\40: The lower one is %d\n",MINIMUM(a,b)); #endif #define MIN #ifndef MIN printf("\40: The lower one is %d\n",MINIMUM(a,b)); #else printf("\40: The larger one is %d\n",MAXIMUM(a,b)); #endif } ----------------------------------------------------------------------------- 【程序50】 题目：#include 的应用练习 1.程序分析： 2.程序源代码： test.h 文件如下： #define LAG > #define SMA < #define EQ == #include "test.h" /*一个新文件50.c，包含test.h*/ #include "stdio.h" void main() { int i=10; int j=20; if(i LAG j) printf("\40: %d larger than %d \n",i,j); else if(i EQ j) printf("\40: %d equal to %d \n",i,j); else if(i SMA j) printf("\40:%d smaller than %d \n",i,j); else printf("\40: No such value.\n"); }
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