task.4
#include <stdio.h> #include<stdlib.h> #define N 4 int main() { int a[N] = {2, 0, 2, 3}; char b[N] = {'2', '0', '2', '3'}; int i; printf("sizeof(int) = %d\n", sizeof(int)); printf("sizeof(char) = %d\n", sizeof(char)); printf("\n"); // 输出int型数组a中每个元素的地址、值 for (i = 0; i < N; ++i) printf("%p: %d\n", &a[i], a[i]); printf("\n"); // 输出char型数组b中每个元素的地址、值 for (i = 0; i < N; ++i) printf("%p: %c\n", &b[i], b[i]); printf("\n"); // 输出数组名a和b对应的值 printf("a = %p\n", a); printf("b = %p\n", b); system("pause"); return 0; }
1.2
#include <stdio.h> #include<stdlib.h> #define N 2 #define M 3 int main() { int a[N][M] = {{1, 2, 3}, {4, 5, 6}}; char b[N][M] = {{'1', '2', '3'}, {'4', '5', '6'}}; int i, j; // 输出int型二维数组a中每个元素的地址、值 for (i = 0; i < N; ++i) for (j = 0; j < M; ++j) printf("%p: %d\n", &a[i][j], a[i][j]); printf("\n"); // 输出int型二维数组名a, 以及,a[0], a[1]的值 printf("a = %p\n", a); printf("a[0] = %p\n", a[0]); printf("a[1] = %p\n", a[1]); printf("\n"); // 输出char型二维数组b中每个元素的地址、值 for (i = 0; i < N; ++i) for (j = 0; j < M; ++j) printf("%p: %c\n", &b[i][j], b[i][j]); printf("\n"); // 输出char型二维数组名b, 以及,b[0], b[1]的值 printf("b = %p\n", b); printf("b[0] = %p\n", b[0]); printf("b[1] = %p\n", b[1]); printf("\n"); system("pause"); return 0; }
2
#include <stdio.h> #include<stdlib.h> #include <string.h> #define N 80 void swap_str(char s1[N], char s2[N]); void test1(); void test2(); int main() { printf("测试1: 用两个一维维数组,实现两个字符串交换\n"); test1(); printf("\n测试: 用二维数组,实现两个字符串交换\n"); test2(); system("pause"); return 0; } void test1() { char views1[N] = "hey, C, I hate u."; char views2[N] = "hey, C, I love u."; printf("交换前: \n"); puts(views1); puts(views2); swap_str(views1, views2); printf("交换后: \n"); puts(views1); puts(views2); } void test2() { char views[2][N] = {"hey, C, I hate u.", "hey, C, I love u."}; printf("交换前: \n"); puts(views[0]); puts(views[1]); swap_str(views[0], views[1]); printf("交换后: \n"); puts(views[0]); puts(views[1]); } void swap_str(char s1[N], char s2[N]) { char tmp[N]; strcpy(tmp, s1); strcpy(s1, s2); strcpy(s2, tmp); }
3.1
#include <stdio.h> #define N 80 int count(char x[]); int main() { char words[N+1]; int n; while(gets(words) != NULL) { n = count(words); printf("单词数: %d\n\n", n); } return 0; } int count(char x[]) { int i; int word_flag = 0; // 用作单词标志,一个新单词开始,值为1;单词结束,值为0 int number = 0; // 统计单词个数 for(i = 0; x[i] != '\0'; i++) { if(x[i] == ' ') word_flag = 0; else if(word_flag == 0) { word_flag = 1; number++; } } return number; }
3.2
#include <stdio.h> #define N 1000 int main() { char line[N]; int word_len; // 记录当前单词长度 int max_len; // 记录最长单词长度 int end; // 记录最长单词结束位置 int i; while(gets(line) != NULL) { word_len = 0; max_len = 0; end = 0; i = 0; while(1) { // 跳过连续空格 while(line[i] == ' ') { word_len = 0; // 单词长度置0,为新单词统计做准备 i++; } // 在一个单词中,统计当前单词长度 while(line[i] != '\0' && line[i] != ' ') { word_len++; i++; } // 更新更长单词长度,并,记录最长单词结束位置 if(max_len < word_len) { max_len = word_len; end = i; // end保存的是单词结束的下一个坐标位置 } // 遍历到文本结束时,终止循环 if(line[i] == '\0') break; } // 输出最长单词 printf("最长单词: "); for(i = end - max_len; i < end; ++i) printf("%c", line[i]); printf("\n\n"); } return 0; }
4
#include <stdio.h> #define N 5 void input(int x[], int n); void output(int x[], int n); double average(int x[], int n); void bubble_sort(int x[], int n); int main() { int scores[N]; double ave; printf("录入%d个分数:\n", N); input(scores, N); printf("\n输出课程分数: \n"); output(scores, N); printf("\n课程分数处理: 计算均分、排序...\n"); ave = average(scores, N); bubble_sort(scores, N); printf("\n输出课程均分: %.2f\n", ave); printf("\n输出课程分数(高->低):\n"); output(scores, N); 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"); } double average(int x[], int n) { int i; double t=0; for (i = 0; i < n; ++i) t += x[i]; return t/i; } void bubble_sort(int x[], int n) { int t,p; double m; for (p = 0; p < n-1; p++) { for (t = 0; t < n-p-1; t++) { if (x[t] < x[t + 1]) { m = x[t]; x[t] = x[t + 1]; x[t + 1] = m; } } } }
5
#include <stdio.h> #define N 100 void dec2n(int x, int n); int main() { int x; printf("输入一个十进制整数: "); while(scanf("%d", &x) != EOF) { dec2n(x, 2); dec2n(x, 8); dec2n(x, 16); printf("\n输入一个十进制整数: "); } return 0; } void dec2n(int x, int n) { char a[N], b[N]; int i,t,d,j; j = x; for (i = 0; j > 0; i++) { t = j % n; if (t < 10) a[i] = t + '0'; else switch (t) { case 10: a[i] = 'A'; case 11: a[i] = 'B'; case 12: a[i] = 'C'; case 13: a[i] = 'D'; case 14: a[i] = 'E'; case 15: a[i] = 'F'; } j = j / n; } a[i] = '\0'; for (d = 0; d < i; d++) b[d] = a[i - d - 1]; b[d] = '\0'; puts(b); }
6
#include <stdio.h> #define N 100 #define M 4 void output(int x[][N], int n); void rotate_to_right(int x[][N], int n); int main() { int t[][N] = {{21, 12, 13, 24}, {25, 16, 47, 38}, {29, 11, 32, 54}, {42, 21, 33, 10}}; printf("原始矩阵:\n"); output(t, M); rotate_to_right(t, M); printf("变换后矩阵:\n"); output(t, M); return 0; } void output(int x[][N], int n) { int i, j; for (i = 0; i < n; ++i) { for (j = 0; j < n; ++j) printf("%4d", x[i][j]); printf("\n"); } } void rotate_to_right(int x[][N], int n) { int i,t; for (i = 0; i < 4; i++) { t = x[i][3]; x[i][3] = x[i][2]; x[i][2] = x[i][1]; x[i][1] = x[i][0]; x[i][0] = t; } }
7.1
#include <stdio.h> #define N 80 void replace(char x[], 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 x[], char old_char, char new_char) { int i; for (i = 0; x[i] != '\0'; ++i) // 思考: '\0'是什么,为什么能作为循环结束条件 if (x[i] == old_char) x[i] = new_char; }
7.2
#include <stdio.h> #define N 80 int main() { char str[N], ch; int i; printf("输入字符串: "); gets(str); printf("输入一个字符: "); ch = getchar(); printf("截断处理......"); i = 0; while (str[i] != '\0') { if (str[i] == ch) str[i] = '\0'; i++; } str[i] = '\0'; printf("\n截断处理后字符串: %s\n", str); return 0; }
8
#include <stdio.h> #include <string.h> #define N 5 #define M 20 void bubble_sort(char str[][M], int n); // 函数声明 int main() { char name[][M] = {"Bob", "Bill", "Joseph", "Taylor", "George"}; int i; printf("输出初始名单:\n"); for (i = 0; i < N; i++) printf("%s\n", name[i]); printf("\n排序中...\n"); bubble_sort(name, N); // 函数调用 printf("\n按字典序输出名单:\n"); for (i = 0; i < N; i++) printf("%s\n", name[i]); return 0; } void bubble_sort(char str[][M], int n) { int a, b, c; char tmp[M]; for (a = 0; a < 4; a++) { for (b = 0; b < 20; b++) { if (str[a][b] > str[a + 1][b]) { strcpy(tmp, str[a]); strcpy(str[a], str[a + 1]); strcpy(str[a + 1],tmp); break; } else if (str[a][b] < str[a + 1][b]) break; } } }