大連東軟信息學(xué)院C語(yǔ)言指針練習(xí)2016x

1、一、Make a choiceFor the same data type pointer variable, which operator can notused in C program.A. + B. - C. = D.=when0=i10, for the following statements, which reference is wrong to reference array a=1,2,3,4,5,6,7,8,9,0, *p, i;p=a;A. *(a+i) B. ap-a C. p+i D. *(&ai)when0=i10, for the fo

2、llowing statements, which reference is wrong to reference the address of array a=1,2,3,4,5,6,7,8,9,0, *p,i;p=a;A. &(a+1) B. a+ C. &p D. &piWhat is the result for the following program?#include main()int a=1,2,3,4,5,6,*p;p=a;*(p+3)+=2;printf(%d,%dn,*p,*(p+3);A. 0,5 B. 1,5 C. 0,6 D. 1,6wh

3、at is the result for the following program?#include main()(int a12=(1,2,3,4,5,6,7,8,9,10,11,12, *p4,i;for(i=0;i4;i+)pi=&ai*3;printf(%dn,p32);A.輸出項(xiàng)不合法B. 6C. 8D. 12For the following statements, whats the valu(p1-p2)?int a10, *p1, *p2;p1=a;p2=&a5;A. 5 B. 6 C. 10 D.沒(méi)有指針與指針的減法7.for this function prototyp

4、e:void adder(int *ptr,int b);if there are two integers:int op1=2;int op2=4;which statement of function call is right?A:adder(*op1,op2);B:adder(op1,op2);C:adder(&op1,op2);D:adder(&op1,&op2);8.What does the following program outputs to screenvoidToSrn(int *);main()int a=8;int *ptr=&a;ToSrn(ptr);voidTo

5、Srn(int *ptr)printf(%p”,&a);A:compile error,can not be runD:address of a9.Assumingint *p,a=4;p=&a;which of the following statements is all means addressA:a,p+1B:&a,*pC:&a,pD:*a,p10.Assuming inta10,*p; which one is rightA:*p=&a0;B:*p=a;C:p=a0;D:p=&a0;11.Assuming : int a10, *p=a； which one is the addr

6、ess of a9A:a0+9B:&(p+9)C:*(p+9)12.Assuming:char s1=Hello”,s210,*s3=HelloWorld”,*s4;which one of the following statements is correct?A:strcpy(s10,Morning);B:s2=Morning”;C:strcpy(s3,Morning);D:strcpy(s4,Morning);For the following statements, after execution the statement a=p+2;whats the value of a0?fl

7、oat a3=(1.2,45.6,-23.0;float *p=a;A. 1.2 B. 45.6C. -23.0 D.語(yǔ)句有錯(cuò)What format specifiers (in order) should be used in the printf() statement in thefollowing program? Note that in the program the correct format specifiers have beenreplaced by Z.#include int main(void) (int x = 5;int *x_ptr = &x;printf(%

8、Z, %Z, %Z, %Zn, x, *x_ptr, &x, x_ptr);%f, %p, %d, %p%d, %d, %p, %p%d, %p, %d, %p%p, %d, %d, %p二、Fill the blank.the result of printf(%sd”,ab0cd); is 【1】。A pointer is a special type of variable which stores the 【1】 of a memory location.assuming:int a=1,3,5,7,9,11,*p=a; and the value of *p is _ 【1】.the

9、 value of *(a+5) is 【2】For the following statement, int a=8,1,2,5,0,4,7,6,3,9;Whats the valua*(a+a3)?. 二、 read the following programs.On a machine in which addresses are 4 bytes, what is printed by the following program: #include int main(void)char fun = Programming is fun.;char favorite = My favori

10、te class is programming.;char *x = fun;printf(%dn, sizeof(fun);printf(%dn, sizeof(favorite);printf(%dn, sizeof(x);What does the following program print?#include int main(void)int data = 1, 2, 3, 4, 5, 6, 7;int *ptr = data;int i;printf( i *ptrnn);for(i = 2; i -4; i-)printf(%2d, %2dn, i, *ptr);ptr+=i;

11、三、write the following program.1. Rewrite the following program such that the function has a return type of void andthe variable y gets its value using pointers.#include intdbl(intnum);int main(void)int x = 13;x = dbl(x);printf(x doubled is %dn, x);intdbl(intnum)return 2*num;2. Write a program that h

12、as a function that when passed a string will print every fourthcharacterof the string. In main() you should create the string This is an examplestring. and pass this to your function to be printed.Change the program below to print I love programming. You should do this byusing the values in lovetext

13、 to change hatetext. Hint: think about the relationshipbetween the index values of the letters in love and the index values for the word hate.This can be done without creating any new variables.#include int main(void)int i;charhatetext = I hate programming.;charlovetext = love;/* Your code goes here

14、. */ printf(%sn, hatetext);Write a program that has a function that when passed a string will print every fourthcharacter of the string. In main() you should create the string This is an examplestring. and pass this to your function to be printed./*Void printString(char *p);*/Void printString(char *

15、p)Int i=0,len=0,length=strlen(p);While(*p!=NULL&lenlength)Printf(c”,*p);P+=4;Len+=4;main()Char str=This is an examplestring.;printString(str);5./*Write a program.In main(), declare an integer array,and initialize the array through keyboard.Create a multiply() function that when given the array and t

16、he number of array elements,in which can double the value of the array elements( that is ai*2). Also create another print() function for printing the array elements.Call the two functions in main function.Tip: when running the program, input n with 14. */#include #define N 14 void multiply(int a,int

17、 n);void print(int *p);main(void)int aN,i;for(i=0;iN;i+)printf(n No.%d: ,i+1);scanf(%d,&ai);/*(1) call the multiply() function*/*Programmultiply(a,N);End/*(2) call the print() function*/*ProgramPrint(a);Endvoid multiply(int a,int n) int I;/*(3) double the value of the array elements*/Program*/Endvoi

18、d print(int *p)int i;printf(nThe output values after multiply are:n);/*(4) output the value of the array elements*/*ProgramEnd1. Write a program that has a function that when passed a string will print every fourthcharacter of the string. In main() you should create the string ”This is an examplestr

19、ing.” and pass this to your function to be printed./*Void printString(char *p);*/Void printString(char *p)Int i=0,len=0,length=strlen(p);While(*p!=NULL&lenlength)Printf(%c,*p);P+=4;Len+=4;main()Char str=”This is an examplestring.”; printString(str);2./*Write a program.In main(), declare an integer a

20、rray,and initialize the array through keyboard.Create a multiply() function that when given the array and the number of array elements,in which can double the value of the array elements( that is ai*2). Also create another print() function for printing the array elements.Call the two functions in main function.Tip: when running the program, input n