实验五
1.1
#include <stdio.h> #define N 5 void input(int x[], int n); void output(int x[], int n); void find_min_max(int x[], int n, int* pmin, int* pmax); int main() { int a[N]; int min, max; printf("录入%d个数据:\n", N); input(a, N); printf("数据是: \n"); output(a, N); printf("数据处理...\n"); find_min_max(a, N, &min, &max); printf("输出结果:\n"); printf("min = %d, max = %d\n", min, max); return 0; } void input(int x[], int n) { int i; for (i = 0; i < n; ++i) scanf("%d", &x[i]); } void output(int x[], int n) { int i; for (i = 0; i < n; ++i) printf("%d ", x[i]); printf("\n"); } void find_min_max(int x[], int n, int* pmin, int* pmax) { int i; *pmin = *pmax = x[0]; for (i = 1; i < n; ++i) if (x[i] < *pmin) *pmin = x[i]; else if (x[i] > *pmax) *pmax = x[i]; }
1.2
#include <stdio.h>
#define N 5
void input(int x[], int n);
void output(int x[], int n);
int* find_max(int x[], int n);
int main() {
int a[N];
int* pmax;
printf("录入%d个数据:\n", N);
input(a, N);
printf("数据是: \n");
output(a, N);
printf("数据处理...\n");
pmax = find_max(a, N);
printf("输出结果:\n");
printf("max = %d\n", *pmax);
return 0;
}
void input(int x[], int n) {
int i;
for (i = 0; i < n; ++i)
scanf("%d", &x[i]);
}
void output(int x[], int n) {
int i;
for (i = 0; i < n; ++i)
printf("%d ", x[i]);
printf("\n");
}
int* find_max(int x[], int n) {
int* ptr = &x[0];
int i;
for (i = 1; i < n; ++i)
if (x[i] > *ptr)
ptr = &x[i];
return ptr;
}
2
#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;
}
#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;
}
3
#include <stdio.h>
#include <stdio.h>
int main() {
int x[2][4] = { {1, 9, 8, 4}, {2, 0, 4, 9} };
int i, j;
int* ptr1; // 指针变量，存放int类型数据的地址
int(*ptr2)[4]; // 指针变量，指向包含4个int元素的一维数组
printf("输出1: 使用数组名、下标直接访问二维数组元素\n");
for (i = 0; i < 2; ++i) {
for (j = 0; j < 4; ++j)
printf("%d ", x[i][j]);
printf("\n");
}
printf("\n输出2: 使用指向元素的指针变量p间接访问二维数组元素\n");
for (ptr1 = &x[0][0], i = 0; ptr1 < &x[0][0] + 8; ++ptr1, ++i) {
printf("%d ", *ptr1);
if ((i + 1) % 4 == 0)
printf("\n");
}
printf("\n输出3: 使用指向一维数组的指针变量q间接访问二维数组元素\n");
for (ptr2 = x; ptr2 < x + 2; ++ptr2) {
for (j = 0; j < 4; ++j)
printf("%d ", *(*ptr2 + j));
printf("\n");
}
return 0;
}
4.1
#include <stdio.h>
#define N 80
void replace(char* str, char old_char, char new_char); // 函数声明
int main() {
char text[N] = "c programming is difficult or not, it is a question.";
printf("原始文本: \n");
printf("%s\n", text);
replace(text, 'i', '*'); // 函数调用 注意字符形参写法，单引号不能少
printf("处理后文本: \n");
printf("%s\n", text);
return 0;
}
// 函数定义
void replace(char* str, char old_char, char new_char) {
int i;
while (*str) {
if (*str == old_char)
*str = new_char;
str++;
}
}
#include <stdio.h>
#define N 80
void str_trunc(char* str, char x);
int main() {
char str[N];
char ch;
printf("输入字符串: ");
gets(str);
printf("输入一个字符: ");
ch = getchar();
printf("截断处理...\n");
str_trunc(str, ch);
printf("截断处理后的字符串: %s\n", str);
}
void str_trunc(char* str, char x) {
while (*str) {
if (*str == x) {
*(++str) = '\0';
}
str++;
}
return 0;
}
5
#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) {
tmp = name[j];
name[j] = name[j + 1];
name[j + 1] = tmp;
}
}
#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++)
if (strcmp(name[j], name[k]) < 0)
k = j;
if (k != i) {
tmp = name[i];
name[i] = name[k];
name[k] = tmp;
}
}
}
6
#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) {
int judge = 1;
int i;
for (i = 0; i < 18; i++) {
if (strlen(str) != 18) {
judge = 0;
break;
}
if (*(str + i) < 48 || *(str + i) > 57) {
if (*(str + i) != 'X') {
judge = 0;
break;
}
}
}
return judge;
}
7
#include <stdio.h>
#define N 80
void encoder(char* str); // 函数声明
void decoder(char* str); // 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;
}
void encoder(char* str) {
for (int i = 0; i < N; i++) {
if (*(str + i) >= 'a' && *(str + i) <= 'z') {
if (*(str + i) == 'z') {
*(str + i) = 'a';
}
else {
(*(str + i))++;
}
}
if (*(str + i) >= 'A' && *(str + i) <= 'Z') {
if (*(str + i) == 'Z') {
*(str + i) = 'A';
}
else {
(*(str + i))++;
}
}
}
}
void decoder(char* str) {
for (int i = 0; i < N; i++) {
if (*(str + i) >= 'a' && *(str + i) <= 'z') {
if (*(str + i) == 'a') {
*(str + i) = 'z';
}
else {
(*(str + i))--;
}
}
if (*(str + i) >= 'A' && *(str + i) <= 'Z') {
if (*(str + i) == 'A') {
*(str + i) = 'Z';
}
else {
(*(str + i))--;
}
}
}
}
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