【C/PTA —— 13.指针2（课外实践）】

C/PTA —— 13.指针2（课外实践）

一.函数题
- 6-1 鸡兔同笼问题
- 6-2 冒泡排序
- 6-3 字符串反正序连接
- 6-4 计算最长的字符串长度
- 6-5 查找星期
二.编程题
- 7-1 C程序设计实验5-7 数组指针作函数参数
- 7-2 查找奥运五环色的位置

一.函数题

6-1 鸡兔同笼问题

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int ChickenRabbit(int* chicken, int* rabbit, int head, int foot)
{int i;int j;if (foot % 2 != 0 && head < 0 && foot < 0){return 0;}for (i = 0; i <= head; i++){j = head - i;if (i * 2 + j * 4 == foot){*chicken = i;*rabbit = j;return 1;}}return 0;
}

6-2 冒泡排序

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void bubble(int a[], int n)
{int i, j;for (i = 0; i < n - 1; i++){int flag = 1;for (j = 0; j < n - i - 1; j++){if (a[j] > a[j + 1]){int tmp = a[j];a[j] = a[j + 1];a[j + 1] = tmp;flag = 0;}}if (flag == 1)break;}
}

6-3 字符串反正序连接

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#include<string.h>
void fun(char* s, char* t)
{char* str = s;int len = strlen(s);int j = 0;for (int i = len - 1; i >= 0; i--){t[j] = str[i];j++;}t[j] = '\0';strcat(t, s);
}

6-4 计算最长的字符串长度

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int max_len(char* s[], int n)
{int max = 0;for (int i = 0; i < n; i++){if (strlen(s[i]) > max)max = strlen(s[i]);}return max;
}

6-5 查找星期

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int getindex(char* s)
{if (strcmp(s, "Sunday")==0)return 0;else if (strcmp(s,"Monday")==0)return 1;else if (strcmp(s,"Tuesday")==0)return 2;else if (strcmp(s,"Wednesday")==0)return 3;else if (strcmp(s,"Thursday")==0)return 4;else if (strcmp(s,"Friday")==0)return 5;else if (strcmp(s,"Saturday")==0)return 6;elsereturn -1;
}

二.编程题

7-1 C程序设计实验5-7 数组指针作函数参数

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#include  <stdio.h>
#define STUD   30 
#define COURSE 5 
void  Input(int *pScore, int m, int n);
void  Total(int *pScore, int sum[], float aver[], int m, int n);
void  Print(int *pScore, int sum[], float aver[], int m, int n);
int main()
{               int     m, n, score[STUD][COURSE], sum[STUD];float   aver[STUD];scanf("%d", &m);scanf("%d", &n);Input(*score, m, n);Total(*score, sum, aver, m, n);Print(*score, sum, aver, m, n);return 0;
}               
//函数功能：连续输入m*n个整数存入起始地址为pScore的连续内存单元中
void  Input(int *pScore, int m, int n)
{               int   i, j;for (i = 0; i < m; i++){               for (j = 0; j < n; j++){               scanf("%d", &pScore[i * n + j]);}}
}               
//函数功能：计算起始地址为pScore的连续内存中存储的m*n个数组元素值的总分和平均分
void  Total(int *pScore, int sum[], float aver[], int m, int n)
{               int  i, j;for (i = 0; i < m; i++){               sum[i] = 0;for (j = 0; j < n; j++){               sum[i] = sum[i] + pScore[i * n + j];}aver[i] = (float) sum[i] / n;}
}               
//函数功能：打印总分和平均分
void  Print(int *pScore, int sum[], float aver[], int m, int n)
{               int  i, j;for (i = 0; i < m; i++){               printf("%d %.1f\n", sum[i], aver[i]);}
}

7-2 查找奥运五环色的位置

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#define max 80
#include<string.h>
int getcolor(char* s)
{if (strcmp(s, "red") == 0)return 1;else if (strcmp(s, "blue") == 0)return 2;else if (strcmp(s, "yellow") == 0)return 3;else if (strcmp(s, "green") == 0)return 4;else if (strcmp(s, "black") == 0)return 5;elsereturn -1;
}
int main()
{char str[max];int n;scanf("%s",str);n = getcolor(str);if (n == -1)printf("Not Found\n");elseprintf("%d\n", n);return 0;
}