task1
源码：
#include<stdio.h>
#define N 4
void test1(){
int a[N] = {1,9,8,4};
int i;
printf("sizeof(a) = %d\n",sizeof(a));
for (i = 0;i<N;++i)
printf("%p:%d\n",&a[i],a[i]);
printf("a = %p\n",a);
}
void test2(){
char b[N] ={'1','9','8','4'};
int i;
printf("sizeof(b) = %d\n",sizeof(b));
for (i = 0;i < N;++i)
printf("%p:%c\n",&b[i],b[i]);
printf("b = %p\n",b);
}
int main(){
printf("测试1：int类型一维数组\n");
test1();
printf("\n测试2：char类型一维数组\n");
test2();
return 0;
}
#include<stdio.h>
#define N 2
#define M 4
void test1(){
int a[N][M] = {{1,9,8,4},{2,0,4,9}};
int i,j;
printf("sizeof(a) = %d\n",sizeof(a));
for (i = 0;i < N;++i)
for(j = 0;j < M;++j)
printf("%p:%d\n",&a[i][j],a[i][j]);
printf("\n");
printf("a = %p\n",a);
printf("a[0] = %p\n",a[0]);
printf("a[1] = %p\n",a[1]);
printf("\n");
}
void test2(){
char b[N][M] = {{'1','9','8','4'},{'2','0','4','9'}};
int i,j;
printf("sizeof(b) = %d\n",sizeof(b));
for(i = 0;i < N;++i)
for(j = 0;j < M;++j)
printf("%p:%c\n",&b[i][j],b[i][j]);
printf("\n");
printf("b = %p\n",b);
printf("b[0] = %p\n",b[0]);
printf("b[1] = %p\n",b[1]);
}
int main(){
printf("测试1：int类型两维数组");
test1();
printf("测试2：char类型两维数组");
test2();
return 0;
}
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task2
源码：
#include<stdio.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char数组，实现两个字符串交换\n");
test1();
printf("测试2：用二维char数组，实现两个字符串交换\n");
test2();
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);
}
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task3
源码：
#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;
int number = 0;
for(i = 0;x[i]!='\0';i++){
if(x[i] == ' ')
word_flag = 0;
else if(word_flag == 0){
word_flag = 1;
number++;
}
}
return number;
}
#include <stdio.h>
#define N 1000
int main() {
char line[N];
int word_len;
int max_len;
int end;
int i;
while(gets(line) != NULL) {
word_len = 0;
max_len = 0;
end = 0;
i = 0;
while(1) {
while(line[i] == ' ') {
word_len = 0;
i++;
}
while(line[i] != '\0' && line[i] != ' ') {
word_len++;
i++;
}
if(max_len < word_len) {
max_len = word_len;
end = i;
}
if(line[i] == '\0')
break;
}
printf("最长单词: ");
for(i = end - max_len; i < end; ++i)
printf("%c", line[i]);
printf("\n\n");
}
return 0;
}
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task4
源码：
#include<stdio.h>
#define N 100
void dec_to_n(int x,int n);
int main(){
int x;
printf("输入一个十进制整数:");
while(scanf("%d",&x)!=EOF){
dec_to_n(x,2);
dec_to_n(x,8);
dec_to_n(x,16);
printf("\n输入一个十进制整数：");
}
return 0;
}
void dec_to_n(int x,int n){
char map[] = {"0123456789ABCDEF"};
char ans[N];
int r,i;
int cnt = 0;
do{
r = x % n;
ans[cnt] = map[r];
cnt++;
x = x/n;
} while(x!=0);
for(i = cnt - 1;i>=0;--i){
printf("%c",ans[i]);
}
printf("\n");
}
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task5
源码：
#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 sum = 0.0,ave;
for(i = 0;i<+n;i++)
sum+=x[i];
ave=sum/n;
return ave;
}
void bubble_sort(int x[], int n){
int i,j,temp,flag;
for(i = 0;i < n-1;i++){
flag = 0;
for(j = 0;j < n-i-1;j++){
if(x[j] < x[j+1]){
flag = 1;
temp = x[j];
x[j] = x[j+1];
x[j+1] = temp;
}
}
if(flag == 0){
break;
}
}
for(i = 0;i < n;i++){
printf("%d ",x[i]);
}
}
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task6
源码：
#include <stdio.h>
#include <string.h>
#define N 5
#define M 20
void output(char str[][M], int n);
void bubble_sort(char str[][M], int n);
int main() {
char name[][M] = {"Bob", "Bill", "Joseph", "Taylor", "George"};
int i;
printf("输出初始名单:\n");
output(name, N);
printf("\n排序中...\n");
bubble_sort(name, N);
printf("\n按字典序输出名单:\n");
output(name, N);
return 0;
}
void output(char str[][M], int n) {
int i;
for(i = 0; i < n; ++i)
printf("%s\n", str[i]);
}
void bubble_sort(char str[][M], int n){
char temp[M];
int i,j,flag;
for(i = 0;i < n-i-1;i++){
flag = 0;
for(j = 0;j < n-i-1;j++){
if(strcmp(str[j],str[j+1]) > 0){
flag = 1;
strcpy(temp,str[j]);
strcpy(str[j],str[j+1]);
strcpy(str[j+1],temp);
}
}
if(flag == 0){
break;
}
}
}
截图：
task7
源码：
#include<stdio.h>
#include<string.h>
int main(){
char A[100];
char a;
int i,j,num,len,flag;
while(scanf("%s",&A) != EOF){
len = strlen(A);
flag = 0;
for(i = 0;i < len;i++){
a = A[i];
num = 0;
for(j = 0;j < len;j++){
if(a == A[j]){
num++;
}
}
if(num > 1){
printf("Yes\n");
flag = 1;
break;
}
}
if(flag == 0){
printf("No\n");
}
}
return 0;
}
截图：
task8
源码：
#include<stdio.h>
#include<stdlib.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);
system("pause");
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 y[N][N];
for(int i=0;i<n;i++)
for(int j=0;j<n;j++)
y[i][j]=x[i][j];
for(int i=n-1;i>0;i--)
{
for(int j=0;j<n;j++)
x[j][i]=y[j][i-1];
}
for(int j=0;j<n;j++)
x[j][0]=y[j][n-1];
}
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