這個作業屬於哪個課程：https://edu.cnblogs.com/campus/fzu/2024C/
這個作業要求在哪裡： https://edu.cnblogs.com/campus/fzu/2024C/homework/13307
學號：092300125
姓名：張天榮
11
1.
#include <stdio.h>
#define LEN 10
void getnchar(char str[], int n);
int main(int argc, char *argv[])
{
char str[LEN];
printf("Please enter %d characters:\n", LEN - 1);
getnchar(str, LEN);
printf("Result:\n");
puts(str);
printf("Done.\n");
return 0;
}
void getnchar(char str[], int n)
{
for (int i = 0; i < n - 1; ++i)
{
str[i] = getchar();
}
str[n - 1] = '\0';
}
2.
#include <stdio.h>
#include <ctype.h>
#define LEN 10
void getnchar(char str[], int n);
int main(int argc, char* argv[])
{
char str[LEN];
printf("Please enter %d characters:\n", LEN - 1);
getnchar(str, LEN);
printf("Result:\n");
puts(str);
printf("Done.\n");
return 0;
}
void getnchar(char str[], int n)
{
int i = 0;
while (i < n - 1)
{
str[i] = getchar();
if (isspace(str[i]))
{
break;
}
++i;
}
str[i] = '\0';
}
3.
#include <stdio.h>
#include <ctype.h>
#define LEN 10
char* getword(char* str);
int main(int argc, char* argv[])
{
char word[LEN];
printf("Please enter a word (EOF to quit):\n");
while (getword(word) != NULL)
{
printf("Result: %s\n", word);
printf("You can enter a word again (EOF to quit):\n");
}
printf("Done.\n");
return 0;
}
char* getword(char* str)
{
int ch, n = 0;
char* pt = str;
while ((ch = getchar()) != EOF && isspace(ch))
{
continue;
}
if (ch == EOF)
{
return NULL;
}
else
{
n++;
*str++ = ch;
}
while ((ch = getchar()) != EOF && !isspace(ch) && n < LEN - 1)
{
*str++ = ch;
n++;
}
*str = '\0';
if (ch != EOF)
{
while (getchar() != '\n')
{
continue;
}
}
return ch == EOF ? NULL : pt;
}
6.
#include <stdio.h>
#include <string.h>
#define LEN 20
char* s_gets(char* st, int n);
int is_within(char ch, const char* str);
int main(int argc, char* argv[])
{
char ch, str[LEN];
printf("Please enter a string (EOF to quit):\n");
while (s_gets(str, LEN) != NULL)
{
printf("Please enter a character: ");
ch = getchar();
while (getchar() != '\n')
continue;
printf("String: %s\n", str);
if (!is_within(ch, str))
{
printf("Not exist %c in the string.\n", ch);
}
else
{
printf("Exist %c in the string.\n", ch);
}
printf("You can enter a string again (EOF to quit):\n");
}
printf("Done.\n");
return 0;
}
char* s_gets(char* st, int n)
{
char* ret_val;
char* find;
ret_val = fgets(st, n, stdin);
if (ret_val)
{
find = strchr(st, '\n');
if (find)
{
*find = '\0';
}
else
{
while (getchar() != '\n')
continue;
}
}
return ret_val;
}
int is_within(char ch, const char* str)
{
while (*str)
{
if (*str == ch)
{
return 1;
}
++str;
}
return 0;
}
7.
#include <stdio.h>
#include <string.h>
#define LEN 10
void eatline(void);
char* mystrncpy(char* dest, char* src, int n);
char* s_gets(char* st, int n);
int main(int argc, char* argv[])
{
int len;
char target[LEN];
char source[LEN];
printf("Please enter a string (EOF to quit):\n");
while (s_gets(source, LEN) != NULL)
{
printf("Please enter a number for copy (> 0): ");
while (scanf("%d", &len) != 1 || len <= 0)
{
eatline();
printf("Please enter again: ");
}
eatline();
printf("Source string: %s\n", source);
printf("Target string: %s\n", mystrncpy(target, source, len));
printf("You can enter a string again (EOF to quit):\n");
}
printf("Done.\n");
return 0;
}
char* s_gets(char* st, int n)
{
char* ret_val;
char* find;
ret_val = fgets(st, n, stdin);
if (ret_val)
{
find = strchr(st, '\n');
if (find)
{
*find = '\0';
}
else
{
eatline();
}
}
return ret_val;
}
void eatline(void)
{
while (getchar() != '\n')
continue;
return;
}
char* mystrncpy(char* dest, char* src, int n)
{
int count = 0;
while (*src != '\0' && count < n)
{
*(dest + count) = *src++;
count++;
}
*(dest + count) = '\0';
return dest;
}
12
1.
#include <stdio.h>
void critic(int *units);
int main(void)
{
int units;
printf("How many pounds to a firkin of butter?\n");
scanf("%d", &units);
while (units != 56)
{
critic(&units);
}
printf("You must have looked it up!\n");
return 0;
}
void critic(int *units)
{
printf("No luck, my friend. Try again.\n");
scanf("%d", units);
return;
}
2.
pe12-2a.h
#ifndef PE12_2A_H_
#define PE12_2A_H_
void set_mode(int n);
void get_info(void);
void show_info(void);
#endif
pe12-2a.c
#include <stdio.h>
#include "pe12-2a.h"
static int mode;
static double range;
static double fuel;
void set_mode(int n)
{
if (n > 1)
{
printf("Invalid mode specified. Mode %s used.\n",
(0 == mode) ? "0(metric)" : "1(US)");
}
else
{
mode = n;
}
return;
}
void get_info(void)
{
if (0 == mode)
{
printf("Enter distance traveled in kilometers: ");
}
else
{
printf("Enter distance traveled in miles: ");
}
scanf("%lf", &range);
if (0 == mode)
{
printf("Enter fuel consumed in liters: ");
}
else
{
printf("Enter fuel consumed in gallons: ");
}
scanf("%lf", &fuel);
return;
}
void show_info(void)
{
if (0 == mode)
{
printf("Fuel consumption is %.2lf liters per 100km.\n",
(fuel / range) * 100);
}
else
{
printf("Fuel consumption is %.1lf miles per gallon.\n",
range / fuel);
}
return;
}
pe12-3a.h
#ifndef PE12_3A_H_
#define PE12_3A_H_
void set_mode(int *mode, int *n);
void get_info(int mode, double *range, double *fuel);
void show_info(int mode, double range, double fuel);
#endif
pe12-3a.c
#include <stdio.h>
#include "pe12-3a.h"
void set_mode(int *mode, int *n)
{
if (*mode > 1)
{
printf("Invalid mode specified. Mode %s used.\n",
(0 == *n) ? "0(metric)" : "1(US)");
}
else
{
*n = *mode;
}
return;
}
void get_info(int mode, double *range, double *fuel)
{
if (0 == mode)
{
printf("Enter distance traveled in kilometers: ");
}
else
{
printf("Enter distance traveled in miles: ");
}
scanf("%lf", range);
if (0 == mode)
{
printf("Enter fuel consumed in liters: ");
}
else
{
printf("Enter fuel consumed in gallons: ");
}
scanf("%lf", fuel);
return;
}
void show_info(int mode, double range, double fuel)
{
if (0 == mode)
{
printf("Fuel consumption is %.2lf liters per 100 km.\n",
(fuel / range) * 100);
}
else
{
printf("Fuel consumption is %.1lf miles per gallon.\n",
range / fuel);
}
return;
}
pe12-3b.c
#include <stdio.h>
#include "pe12-3a.h"
int main(void)
{
int temp, mode;
double range, fuel;
printf("Enter 0 for metric mode, 1 for US mode: ");
scanf("%d", &mode);
temp = mode;
while (mode >= 0)
{
set_mode(&mode, &temp);
get_info(temp, &range, &fuel);
show_info(temp, range, fuel);
printf("Enter 0 for metric mode, 1 for US mode");
printf("(-1 to quit): ");
scanf("%d", &mode);
}
printf("Done.\n");
return 0;
}
#include <stdio.h>
#include <stdlib.h>
int *make_array(int elem, int val);
void show_array(const int ar[], int n);
int main(void)
{
int *pa;
int size;
int value;
printf("Enter the number of elements: ");
while (scanf("%d", &size) == 1 && size > 0)
{
printf("Enter the initialization value: ");
scanf("%d", &value);
pa = make_array(size, value);
if (pa)
{
show_array(pa, size);
free(pa);
}
printf("Enter the number of elements (<1 to quit): ");
}
printf("Done.\n");
return 0;
}
int *make_array(int elem, int val)
{
int i;
int *pt = (int *)malloc(elem * sizeof(int));
if (NULL == pt)
{
printf("Memory allocation failed!\n");
exit(EXIT_FAILURE);
}
printf("Output %d numbers:\n", val);
for (i = 0; i < elem; i++)
{
pt[i] = val;
}
return pt;
}
void show_array(const int ar[], int n)
{
for (int i = 0; i < n; i++)
{
printf("%d%c", ar[i], (i + 1) % 8 == 0 ? '\n' : ' ');
}
if (n % 8 != 0)
{
printf("\n");
}
}
9.
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define LEN 256
int main(void)
{
int i, n;
char **pt;
static char temp[LEN];
printf("How many words do you wish to enter? ");
scanf("%d", &n);
if ((pt = (char **)malloc(n * sizeof(char *))) != NULL)
{
printf("Enter %d words now:\n", n);
for (i = 0; i < n; i++)
{
scanf("%255s", temp);
pt[i] = (char *)malloc((strlen(temp) + 1) * sizeof(char));
if (NULL == pt[i])
{
printf("Memory allocation failed!\n");
exit(EXIT_FAILURE);
}
strcpy(pt[i], temp);
}
printf("Here are your words:\n");
for (i = 0; i < n; i++)
{
puts(pt[i]);
free(pt[i]);
pt[i] = NULL;
}
free(pt);
pt = NULL;
}
else
{
printf("Memory allocation failed!\n");
exit(EXIT_FAILURE);
}
return 0;
}
