# 55

#include <stdio.h>
#define N 4

int main()
{
int x[N] = {1,9,8,4};
int i;
int *p;

for(i=0;i<N;++i)
printf("%d",x[i]);
printf("\n");
return 0;
}


#include <stdio.h>
#define N 4

int main()
{
int x[N] = {1,9,8,4};
int i;
int *p;

for(p=x;p<x+N;++p)
printf("%d",*p);
printf("\n");
return 0;
}


#include <stdio.h>
#define N 4

int main()
{
int x[N] = {1,9,8,4};
int i;
int *p;

p=x;
for(i=0;i<N;++i)
printf("%d",p[i]);
printf("\n");
return 0;
}


#include <stdio.h>
#define N 4

int main()
{
int x[N] = {1,9,8,4};
int i;
int *p;

p=x;
for(i=0;i<N;++i)
printf("%d",*(p+i));
printf("\n");
return 0;
}


#include <stdio.h>

int main()
{
int x[2][4] = {{1,9,8,4},{2,0,4,9}};
int i,j;
int *p;
int (*q)[4];

for (i=0;i<2;++i)
{
for(j=0;j<4;++j)
printf("%d",x[i][j]);
printf("\n");
}
for(p=&x[0][0],i=0;p<&x[0][0]+8;++p,++i)
{
printf("%d",*p);
if((i+1)%4==0)
printf("\n");
}
for (q=x;q<x+2;++q)
{
for(j=0;j<4;++j)
printf("%d",*(*q+j));
printf("\n");
}
return 0;
}


#include <stdio.h>
#include <string.h>
#define N 80

int main()
{
char s1[] = "Learning makes me happy";
char s2[] = "Learning makes me sleepy";
char tmp[N];

printf("sizeof(s1) vs. strlen(s1): \n");
printf("sizeof(s1) = %d\n", sizeof(s1));
printf("strlen(s1) = %d\n", strlen(s1));

printf("\nbefore swap: \n");
printf("s1: %s\n", s1);
printf("s2: %s\n", s2);

printf("\nswapping...\n");
strcpy(tmp, s1);
strcpy(s1, s2);
strcpy(s2, tmp);

printf("\nafter swap: \n");
printf("s1: %s\n", s1);
printf("s2: %s\n", s2);

return 0;
}


运行：

#include <stdio.h>
#include <string.h>
#define N 80

int main()
{
char *s1 = "Learning makes me happy";
char *s2 = "Learning makes me sleepy";
char *tmp;

printf("sizeof(s1) vs. strlen(s1): \n");
printf("sizeof(s1) = %d\n", sizeof(s1));
printf("strlen(s1) = %d\n", strlen(s1));

printf("\nbefore swap: \n");
printf("s1: %s\n", s1);
printf("s2: %s\n", s2);

printf("\nswapping...\n");
tmp = s1;
s1 = s2;
s2 = tmp;

printf("\nafter swap: \n");
printf("s1: %s\n", s1);
printf("s2: %s\n", s2);

return 0;
}


运行：

#include <stdio.h>
void str_cpy(char *target, const char *source);
void str_cat(char *str1, char *srt2);

int main()
{
char s1[80], s2[20] = "1984";
str_cpy(s1,s2);
puts(s1);

str_cat(s1, " Animal Farm");
puts(s1);

return 0;
}

void str_cpy(char *target, const char *source)
{
while (*target++=*source++);

}
void str_cat(char *str1, char *str2)
{
while (*str1)
str1++;

while (*str1++ = *str2++);

}


运行：

#include <stdio.h>
#define N 80
int func(char *);

int main()
{
char str[80];

while (gets(str) !=NULL)
{
if (func(str))
printf("yes\n");
else
printf("no\n");
}
return 0;
}

int func(char *str)
{
char *begin, *end;

begin = end = str;

while (*end)
end++;

end--;

while(begin<end)
{
if(*begin !=*end)
return 0;
else
{
begin++;
end--;
}
}
return 1;

}


运行：

实验五：

#include <stdio.h>
#define N 80

void func(char *);

int main()
{
char s[N];

while (scanf("%s", s) != EOF)
{
func(s);
puts(s);
}

return 0;
}

void func(char *str)
{
int i;
char *p1, *p2, *p;

p1 = str;
while (*p1 == '*')
p1++;

p2 = str;
while (*p2)
p2++;
p2--;

while (*p2 == '*')
p2--;
//line26-36保留了字符串两端的‘*’
p = str;
i = 0;
while (p < p1)
{
str[i] = *p;
p++;
i++;
}

while (p <= p2)
{
if (*p != '*')
{
str[i] = *p;
i++;
}

p++;
}

while (*p != '\0')
{
str[i] = *p;
p++;
i++;
}
//保留了开头与结尾的‘*’，并剔除了字母中间的‘*’
str[i] = '\0';
}

//task6_1

#include <stdio.h>
#include <string.h>

void sort(char *name[], int n);

int main()
{
char *course[4] = {"C Program",
"C++ Object Oriented Program",
"Operating System",
"Data Structure and Algorithms"};

int i;

sort(course, 4);

for (i = 0; i < 4; i++)
printf("%s\n", course[i]);

return 0;
}

void sort(char *name[], int n)
{
int i, j;
char *tmp;

for (i = 0; i < n - 1; ++i)
for (j = 0; j < n - 1 - i; ++j)
if (strcmp(name[j], name[j + 1]) > 0)     //比ascii码 ,进行排序
{
tmp = name[j];
name[j] = name[j + 1];
name[j + 1] = tmp;
}
}


//task6_2

#include <stdio.h>
#include <string.h>

void sort(char *name[], int n);

int main()
{
char *course[4] = {"C Program",
"C++ Object Oriented Program",
"Operating System",
"Data Structure and Algorithms"};

int i;

sort(course, 4);

for (i = 0; i < 4; i++)
printf("%s\n", course[i]);

return 0;
}

void sort(char *name[], int n)
{
int i, j, k;
char *tmp;

for (i = 0; i < n - 1; i++)
{
k = i;

for (j = i + 1; j < n; j++)             //每一次选一个最小的，对应的次序存在k里
if (strcmp(name[j], name[k]) < 0)
k = j;

if (k != i)
{
tmp = name[i];         //指针数组内存着指针，此处只发生指针的交换
name[i] = name[k];
name[k] = tmp;
}
}
}


运行：

#include <stdio.h>
#include <string.h>
#define N 5

int check_id(char *str); // 函数声明

int main()
{
char *pid[N] = {"31010120000721656X",
"330106199609203301",
"53010220051126571",
"510104199211197977",
"53010220051126133Y"};
int i;

for (i = 0; i < N; ++i)
if (check_id(pid[i])) // 函数调用
printf("%s\tTrue\n", pid[i]);
else
printf("%s\tFalse\n", pid[i]);

return 0;
}

// 函数定义
// 功能: 检查指针str指向的身份证号码串形式上是否合法。
// 形式合法，返回1，否则，返回0
int check_id(char *str)
{
if(strlen(str) != 18)
return 0;

if((str[17] >= 48 && str[17] <= 57) || str[17] == 'X')
return 1;

return 0;
}


运行：

#include <stdio.h>
#define N 80
void encoder(char *s); // 函数声明
void decoder(char *s); // 函数声明

int main()
{
char words[N];

printf("输入英文文本: ");
gets(words);

printf("编码后的英文文本: ");
encoder(words); // 函数调用
printf("%s\n", words);

printf("对编码后的英文文本解码: ");
decoder(words); // 函数调用
printf("%s\n", words);

return 0;
}

/*函数定义

*/
void encoder(char *s)
{
do
{
if((*s >= 'a' && *s <= 'y') || (*s >= 'A' && *s <= 'Y'))
{
*s += 1;
continue;
}

if(*s == 'z')
*s = 'a';

if(*s == 'Z')
*s = 'A';
}while(*(s++));
}

/*函数定义

*/
void decoder(char *s)
{
do
{
if((*s >= 'b' && *s <= 'z') || (*s >= 'B' && *s <= 'Z'))
{
*s -= 1;
continue;
}

if(*s == 'a')
*s = 'z';

if(*s == 'A')
*s = 'Z';
}while(*(s++));
}


posted @ 2023-05-10 18:40  陈宇潇  阅读(69)  评论(0编辑  收藏  举报