一、单项选择题:(10分,每题2分)
1.char *p[10];该语句声明了一个: c 。
A)指向含有10个元素的一维字符型数组的指针变量p
B)指向长度不超过10的字符串的指针变量p
C)有10个元素的指针数组p,每个元素可以指向一个字符串
D) 有10个元素的指针数组p,每个元素存放一个字符串
2.若int x;且有下面的程序片断,则输出结果为: D 。
for (x=3; x<6; x++)
{
printf((x%2) ? "##%d" : "**%d\n", x);
}
A) ##3B) **3C) **3D)##3**4
**4 ##4 ##4**5 ##5
##5 **5
3.在while(!x)语句中的!x与下面条件表达式等价的是:D 。
A) x!=0 B) x==1 C) x!=1 D) x==0 4.已知
struct point
{
int x;
int y;
};
struct rect
{
struct point pt1;
struct point pt2;
};
struct rect rt;
struct rect *rp = &rt;
则下面哪一种引用是不正确的__D______。
A) r t.pt1.x B) (*rp).pt1.x
C) r p->pt1.x D) rt->pt1.x
5.若二维数组a有m行n列,则下面能够正确引用元素a[i][j]的为: C 。
A) *(a+j*n+i) B) *(a+i*n+j)
C) *(*(a+i)+j) D) *(*a+i)+j
CDDDC
二、分析程序并写出运行结果。(25分,每题5分)
1.
#include
main()
int n;
static char *monthName[]=
{"Illegal month", "January", "February", "March", "April", "May", "June", "July", "August",
"September", "October", "November", "December"};
for (n=1; n<=12; n++)
{
printf("%s\n", monthName[n]);
}
}
运行结果是:
January
February
March
April
May
June
July
August
September
October
November
December
2.
#include
#define ARR_SIZE 7
void YH(int a[][ARR_SIZE], int n);
void PrintYH(int a[][ARR_SIZE], int n);
main()
{
int a[ARR_SIZE][ARR_SIZE];
YH(a, ARR_SIZE-1);
PrintYH(a, ARR_SIZE-1);
}
void YH(int a[][ARR_SIZE], int n)
{
int i, j;
for (i=1; i<=n; i++)
{
for (j=1; j<=i; j++)
{
if (j==1 || i==j)
{
a[i][j] = 1;
}
else
{
a[i][j] = a[i-1][j-1] + a[i-1][j]; }
}
}
}
void PrintYH(int a[][ARR_SIZE], int n)
{
int i , j ;
for (i=1; i<=n; i++)
{
for (j=1; j<=i; j++)
{
printf("%4d", a[i][j]);
}
printf("\n");
}
运行结果是:
1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
1 5 10 10 5 1
3.
#include
main()
{
int i, n;
for (i=1; i<=5; i++)
{
printf("Please enter n:");
scanf("%d", &n);
if (n <= 0) continue;
printf("n = %d\n", n);
}
printf("Program is over!\n");
}
程序运行时输入:1 -2 3 -4 5↙
运行结果是:
n = 1
Please enter n: Please enter n:n = 3 Please enter n: Please enter n:n = 5 Program is over!
4.
#include
void Func(int n);
main()
{
int i;
for (i = 0; i < 2; i++)
{
Func(i);
}
}
void Func(int n)
{
static int t = 1;
printf("t=%d\n", t++);
}
运行结果是:
t=1
t=2
5.
#include
int Func(int i);
main()
{
int i;
for (i=3; i<5; i++)
{
printf(" %d", Func(i));
}
printf("\n");
}
int Func(int i)
{
static int k = 10;
for (; i>0; i--)
{
k++;
}
return (k);
}
运行结果是:
13 17
三、阅读并完成程序,在标有下划线的空白处填入适当的表达式或语句,使程序完整并符合题目要求。(20分,每空2分)
1. 下面程序用于读入10个字符串,然后找出最大的字符串并打印。
#include
#include
main()
{
char str[10][80],maxstring[80];
int i;
printf("Enter ten strings:\n");
for (i=0; i<10; i++)
{
scanf("%s", str[i] );
}
strcpy(maxstring, str[0]);
for (i=1; i<10; i++)
{
if (strcmp(maxstring, str[i])<0)或strcmp(str[i], maxstring)>0
{
strcpy(maxstring, str[i]);
}
}
printf("The max string is:%s\n",maxstring);
}
2. 下面这个程序用于交换两个数组的对应元素的值。
#include
#define ARRAY_SIZE 10
void Swap(int *x, int *y);
void Exchange(int a[], int b[], int n);
void InputArray(int a[],int n);
void PrintArray(int a[],int n);
main()
{
int a[ARRAY_SIZE], b[ARRAY_SIZE], n;
printf("Input array lenth n<=10: ");
scanf("%d", &n);
printf("Input array a:\n");
InputArray(a, n);
printf("Input array b:\n");
InputArray(b, n);
Exchange(a,b,n);
printf("After swap:\n");
printf("Array a:\n");
PrintArray(a, n);
printf("Array b:\n");