#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");
for (p = x;p < x + N; ++p)
printf("%d",*p);
printf("\n");
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("stilen(s1) = %d\n", strlen(s1));
printf("\nbefore swap: \n");
printf("s1: %s\n", s1);
printf("s2: %s\n", s2);
printf("\nbefore swap: \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;
}
#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("sizeof(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;
}
#include <stdio.h>
void str_cpy(char *target, const char *source);
void str_cat(char *str1,char *str2);
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++)
;
}
#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;
}
#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--;
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++;
}
str[i] = '\0';
}
#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; ++i)
for (j = 0; j < n - 1 - i; ++j)
if (strcmp(name[j], name[j + 1]) > 0)
{
tmp = name[j];
name[j] = name[j + 1];
name[j + 1] = tmp;
}
}
#include<stdio.h>
#include<stdlib.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]);
system("pause");
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++)
if(strcmp(name[j],name[k])<0)
k = j;
if(k!= i)
{
tmp = name[i];
name[i] = name[k];
name[k] = tmp;
}
}
}
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#define N 5
int check_id(char *str);
int main()
{
char *pid[N] = {"31010120000721656X",
"330106199609203301",
"53010220051126571",
"510104199211197977",
"53010220051126133Y"};
int i;
for(i = 0; i< N;++i)
if(check_id(pid[i]))
printf("%s\tTrue\n",pid[i]);
else
printf("%s\tFalse\n",pid[i]);
system("pause");
return 0;
}
int check_id(char *str)
{
char *p;
p = str;
while((*p>='0'&&*p<='9')||*p=='X')
p++;
if(*p=='\0'&&strlen(str)==18)
return 1;
else
return 0;
}
#include<stdio.h>
#include<stdlib.h>
#define N 80
void encoder(char *s);
void decoder(char *s);
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);
printf("%s\n",words);
printf("对编码后的英文文本解码：");
decoder(words);
printf("%s\n",words);
system("pause");
return 0;
}
void encoder(char *s)
{
while(*s!='\0')
if(*s>=65 && *s<=90||*s>=97 && *s<=122)
{
*s= *s+1;
*s++;
continue;
}
else if(*s=='z'||*s=='Z')
{
*s = *s-25;
*s++;
continue;
}
else
*s++;
}
void decoder(char *s)
{
while(*s!='\0')
if(*s>=65&&*s<=90||*s>=97&&*s<=122)
{
*s= *s-1;
*s++;
continue;
}
else if(*s=='a'||*s=='A')
{
*s = *s+25;
*s++;
continue;
}
else
s++;
}
