【程序41】 题目:学习static定义静态变量的用法 1.程序分析: 2.程序源代码: #include "stdio.h" varfunc() { int var=0; static int static_var=0; printf("40:var equal %d n",var); printf("40:static var equal %d n",static_var); printf("n"); var++; static_var++; } void main() {int i; for(i=0;i<3;i++) varfunc(); } ============================================================== 【程序42】 题目:学习使用auto定义变量的用法 1.程序分析: 2.程序源代码: #include "stdio.h" main() {int i,num; num=2; for (i=0;i<3;i++) { printf("40: The num equal %d n",num); num++; { auto int num=1; printf("40: The internal block num equal %d n",num); num++; } } } ============================================================== 【程序43】 题目:学习使用static的另一用法。 1.程序分析: 2.程序源代码: #include "stdio.h" main() { int i,num; num=2; for(i=0;i<3;i++) { printf("40: The num equal %d n",num); num++; { static int num=1; printf("40:The internal block num equal %dn",num); num++; } } } ============================================================== 【程序44】 题目:学习使用external的用法。 1.程序分析: 2.程序源代码: #include "stdio.h" int a,b,c; void add() { int a; a=3; c=a+b; } void main() { a=b=4; add(); printf("The value of c is equal to %dn",c); } ============================================================== 【程序45】 题目:学习使用register定义变量的方法。 1.程序分析: 2.程序源代码: void main() { register int i; int tmp=0; for(i=1;i<=100;i++) tmp+=i; printf("The sum is %dn",tmp); } ============================================================== 【程序46】 题目:宏#define命令练习(1) 1.程序分析: 2.程序源代码: #include "stdio.h" #define TRUE 1 #define FALSE 0 #define SQ(x) (x)*(x) void main() { int num; int again=1; printf("40: Program will stop if input value less than 50.n"); while(again) { printf("40:Please input number==>"); scanf("%d",&num); printf("40:The square for this number is %d n",SQ(num)); if(num>=50) again=TRUE; else again=FALSE; } } ============================================================== 【程序47】 题目:宏#define命令练习(2) 1.程序分析: 2.程序源代码: #include "stdio.h" #define exchange(a,b) { /*宏定义中允许包含两道衣裳命令的情形,此时必须在最右边加上""*/ int t; t=a; a=b; b=t; } void main(void) { int x=10; int y=20; printf("x=%d; y=%dn",x,y); exchange(x,y); printf("x=%d; y=%dn",x,y); } ============================================================== 【程序48】 题目:宏#define命令练习(3) 1.程序分析: 2.程序源代码: #define LAG > #define SMA < #define EQ == #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"); } ============================================================== 【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 %dn",MAXIMUM(a,b)); #else printf("40: The lower one is %dn",MINIMUM(a,b)); #endif #ifndef MIN printf("40: The lower one is %dn",MINIMUM(a,b)); #else printf("40: The larger one is %dn",MAXIMUM(a,b)); #endif #undef MAX #ifdef MAX printf("40: The larger one is %dn",MAXIMUM(a,b)); #else printf("40: The lower one is %dn",MINIMUM(a,b)); #endif #define MIN #ifndef MIN printf("40: The lower one is %dn",MINIMUM(a,b)); #else printf("40: The larger one is %dn",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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