全国计算机等级考试二级教程-C语言程序设计_第14章_结构体、共用体和用户定义类型

 1 #include<stdio.h>
 2 
 3 typedef struct
 4 {
 5     int num;
 6     double mark;
 7 }REC;
 8 
 9 void sub1(REC x)
10 {
11     x.num = 23;
12     x.mark = 81.5;
13 }
14 
15 void sub2(REC y[])
16 {
17     y[0].num = 12;
18     y[0].mark = 77.5;
19 }
20 
21 main()
22 {
23     REC a = { 16,90.0 }, b[] = { 16,90.0 };
24     sub1(a);
25     printf("A)%d,%5.1lf\n", a.num, a.mark);
26     sub2(b);
27     printf("B)%d,%5.1lf\n", b[0].num, b[0].mark);
28 }

 1 #include<stdio.h>
 2 
 3 typedef struct
 4 {
 5     int a;
 6     char b;
 7 }ST;
 8 
 9 ST fun(ST x)        /* 函数的返回值类型是结构体类型ST */
10 {
11     x.a = 99;
12     x.b = ‘S‘;
13     return x;
14 }
15 
16 main()
17 {
18     ST y;
19     y.a = 0;
20     y.b = ‘A‘;
21     printf("y.a=%d,y.b=%c\n", y.a, y.b);
22     y = fun(y);
23     printf("y.a=%d,y.b=%c\n", y.a, y.b);
24 }

 1 #include<stdio.h>
 2 
 3 typedef struct
 4 {
 5     int a;
 6     char b;
 7 }ST;
 8 
 9 ST * fun(ST x)        /* 函数的返回值类型是ST *类型 */
10 {
11     ST * px;
12     x.a = 100;
13     x.b = ‘C‘;
14     px = &x;
15     return px;
16 }
17 
18 main()
19 {
20     ST y, *p;
21     y.a = 999;
22     y.b = ‘X‘;
23     printf("y.a=%d y.b=%c\n", y.a, y.b);
24     p = fun(y);
25     printf("(*p ).a=%d (* p).b=%c\n", (*p).a, (*p).b);
26 }