指针练习参考代码

1、一、基础能力训练：1） 编写一个程序实现功能：将字符串”Computer Secience”赋给一个字符数组，然后从第一个字母开始间隔的输出该串，用指针完成。#include #include int main(char str=”Computer Science”;int flag=1;char *p=str;while(*pif ( flag printf(“%c”,*p;flag = (flag + 1 % 2;p+;printf(“n”;return 0;2） 输入一个字符串，用指针求出字符串的长度。#include int main(char str20, *p;int length

2、=0;printf(“Please input a string: ”;gets(str;p=str;while(*p+length+;printf(“The length of string is %dn”, length;return 0;3） 用指针将数组s8=1,2,3,4,5,6,7,8中的值逆序存放。#include int main(int s8=1,2,3,4,5,6,7,8;int *p,*q,count,swap;count = sizeof(s/sizeof(int;p=s; q=s+count-1;while( p < q swap = *p;*p = *q;*q

3、 = swap;p+;q-;for(p=s; p “ %d ” , *p; return 0;4）编写一个程序实现功能：将两个字符串合并为一个字符串并且输出，用指针实现。char str120=“Hello ”, str220=“World ”;#include int main(char str120=“Hello ”, str220=“World ”;char *p=str1, *q=str2;while( *p p+;while( *q *p = *q;p+;q+;*p = 0;printf(“%sn”, str1;return 0;5 编写一个程序实现以下功能：用指针数组处理一个二维数

4、组，要求求出二维数组所有元素的和。int array34= 7, 10, -2, 3,14, 30, 6, -15,0, 5, 27, -7 #include int main(int array34=7,10,-2,3,14,30,6,-15,0,5,27,-7;int *pa3=array0, array1, array2, i, j;int sum=0;for(i=0;i<3;i+for(j=0;j<4;j+,pai+sum+=*pai;printf("%dn",sum;return 0;二、进阶能力落实：1） 已知数组a10和b10中元素的值递增有序，用

5、指针实现将两个数组中的元素按递增的顺序输出。#include int main(int a10=1, 4, 12, 13, 14, 20, 25, 32, 33, 40;int b10=0, 3, 15, 18, 19, 25, 39, 43, 44, 50;int *p=a, *q=b;while( (p < (a+10 && (q < (b+10 if( *p < *q printf("%d ", *p;p+;elseprintf("%d ", *q;q+;if( p = = (a+10 p = q;q = b;el

6、seq = a;while( p < (q+10 printf("%d ", *p+;printf("n"return 0;2 定义字符指针数组char *str5分别指向5个字符串常量，从小到大输出字符串的内容。#include int main(int i,j,min;char *str5= "Shanghai","Beijing","Guangzhou","Tianjin","Chongqin"char *p;for(i=0;i<4;i+

7、min = i;for(j=i+1;j<5;j+ if( strcmp(strmin,strj > 0 min = j;p = stri;stri = strmin;strmin = p;for(i=0;i<5;i+printf("%sn", stri;return 0;3 已知数组内容如下s=1,2,3,4,5,6,7,8,9, 输入一个数n(1 <= n <= 9,使得该数组内容顺序后移n个位置。如n=3时，数组后移3个位置后的内容为7,8,9,1,2,3,4,5,6#include #include #define LEN 9 int m

8、ain(int arrayLEN=1,2,3,4,5,6,7,8,9;int i,num,temp,*p;printf("Please input the number(1-9 of elements you want to move:"scanf("n%d", #if(num < 1 | (num > 9printf("The number is out of range(1-9, exit.n"exit(0;for(i=0;i temp = *(array+LEN-1;for(p=array+LEN-1;p>ar

9、ray;p-*p = *(p-1;*p = temp;for(p=array;p printf("n"return 0;4 Page-269 10.16#include #define LEN 80int main(char strLEN,*p;int arrayLEN/2,value = 0,n = 0;int begin_count=0; printf("Please input a string which including any digits:n"gets(str;/printf("%sn", str;p = str;wh

10、ile( *p if (*p >= '0' && (*p <= '9'begin_count = 1;value = value*10 + *p - '0'elseif ( begin_count = = 1arrayn+=value;begin_count = 0;value = 0;p+; if (begin_count = = 1 arrayn+=value;for(value=0;value printf("n" return 0;#include #define LEN 80int main(char strLEN,*p = str;int arrayLEN/2,value = 0,n = 0;printf("Please input a string which including any digits:n"gets(str;/printf("%sn", str;while( *p if (*p >= '0' && (*p <= '9'value = value*10 + *