1、使用指针实现strcpy、strcat函数的功能
#include <stdio.h>int main(int argc, const char *argv[]){char s1[32] = "aabbcc";char s2[32] = "112233";char *p1 = &s1;char *p2 = &s2;while(*p1){p1++;}while(*p2){*p1 = *p2;p1++;p2++;}*p1 = *p2;//'\0'p1 = s1;//重新让指针指向字符串首地址p2 = s2;printf("%s\n",p1);printf("%s\n",p2);return 0;}
#include <stdio.h>int main(int argc, const char *argv[]){char s1[32] = "helloqwer";char s2[32] = "world";char *p1 = s1;char *p2 = s2;while(*p2){*p1++=*p2++;}*p1 = *p2;p1 = s1;//重新让指针指向字符串首地址p2 = s2;printf("%s\n",p1);printf("%s\n",p2);return 0;}
2、设计一个程序，判断操作系统是大端存储还是小端存储
#include <stdio.h>int main(int argc, const char *argv[]){int a = 0x12345678;char *p = &a;if(*p=0x78){printf("小\n");}else{printf("大\n");}return 0;}
3、指针实现冒泡排序
#include <stdio.h>int main(int argc, const char *argv[]){int arr[5]={8,9,4,2,5};int *p = arr;int i = 0;int j = 0;int temp = 0;for(i=1;i<5;i++){for(j=0;j<5-i;j++){if(p[j]>p[j+1]){temp = p[j+1];p[j+1] = p[j];p[j] = temp;}}}for(i=0;i<5;i++){printf("%d\n",p[i]);}return 0;}
4、用指针的方式进行字符串倒叙。"abcdef"==>"fedcba"
#include <stdio.h>int main(int argc, const char *argv[]){char s1[]="abcdef";char *p = s1;int count = 0;int temp = 0;while(*p){count++;p++;}printf("%d\n",count);for(int k=0;k<count/2;k++){temp = s1[k];s1[k]=s1[count-k-1];s1[count-k-1]=temp;}puts(s1);return 0;}
5、终端获取字符串删除空格，用指针方式实现
#include <stdio.h>int main(int argc, const char *argv[]){char s1[30]="";gets(s1);char *p=s1;int i=0,j=0;while (p[i]!='\0'){if (p[i]!=' '){p[j] = p[i];j++;}i++;}p[j] = '\0';puts(s1);return 0;}
