#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("test1: int type One-dimensional arrays\n");
test1();
printf("\ntest2: char type One-dimensional arrays\n");
test2();
return 0;
}
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#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("test1: Uses two one-dimensional char arrays to exchange two strings\n");
test1();
printf("\ntest2: Uses a two-dimensional char array to exchange two strings\n");
test2();
return 0;
}
void test1() {
char views1[N] = "hey, C, I hate u.";
char views2[N] = "hey, C, I love u.";
printf("Before exchanging: \n");
puts(views1);
puts(views2);
swap_str(views1, views2);
printf("After exchanging: \n");
puts(views1);
puts(views2);
}
void test2() {
char views[2][N] = {"hey, C, I hate u.",
"hey, C, I love u."};
printf("Before exchanging: \n");
puts(views[0]);
puts(views[1]);
swap_str(views[0], views[1]);
printf("After exchanging: \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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#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("the number of words: %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;
}
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#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("The longest word is: ");
for(i = end - max_len; i < end; ++i)
printf("%c", line[i]);
printf("\n\n");
}
return 0;
}
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#include <stdio.h>
#define N 100
void dec_to_n(int x, int n)
{
int a=x,i=0;
char str[N];
do{
if(n<=10)
str[i]=a%n+'0';
else
{
switch (a%n)
{
case 10:str[i]='A';break;
case 11:str[i]='B';break;
case 12:str[i]='C';break;
case 13:str[i]='D';break;
case 14:str[i]='E';break;
case 15:str[i]='F';break;
default:str[i]=a%n+'0';break;
}
}
a=a/n;
i++;
}while(a!=0);
for(i=i-1;i>=0;i--)
{
printf("%c",str[i]);
}
printf("\n");
}
int main() {
int x;
printf("Enter a decimal integer: ");
while(scanf("%d", &x) != EOF)
{
dec_to_n(x, 2);
dec_to_n(x, 8);
dec_to_n(x, 16);
printf("\nEnter a decimal integer: ");
}
return 0;
}
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#include <stdio.h>
#define N 5
void input(int x[], int n);
void output(int x[], int n);
double average(int x[], int n)
{
int i;
double sum=0;
for(i=0;i<N;i++)
sum+=x[i];
return sum/N;
}
void bubble_sort(int x[], int n)
{
int i,t,j;
for(i=0;i<N;i++)
{
for(j=i+1;j<N;j++)
{
if(x[j]>x[i])
{
t=x[j];
x[j]=x[i];
x[i]=t;
}
}
}
}
int main()
{
int scores[N];
double ave;
printf("Need enter %d scores:\n", N);
input(scores, N);
printf("\nprint the score: \n");
output(scores, N);
printf("\nCourse score processing: calculate the average and sort\n");
ave = average(scores, N);
bubble_sort(scores, N);
printf("\nThe average: %.2f\n", ave);
printf("\nThe score(high to low):\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");
}
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#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 i,j,k;
char t[M];
for(i=0;i<n;i++)
{
for(j=i+1;j<n;j++)
{
if(str[j][0]<str[i][0])
{
strcpy(t,str[i]);
strcpy(str[i],str[j]);
strcpy(str[j],t);
}
else if(str[j][0]==str[i][0])
{
for(k=1;k<=M;k++)
{
if(str[j][k]>str[i][k])
{
strcpy(t,str[i]);
strcpy(str[i],str[j]);
strcpy(str[j],t);
break;
}
}
}
}
}
}
int main() {
char name[][M] = {"Bob", "Bill", "Joseph", "Taylor", "George"};
int i;
printf("Enter the native name list:\n");
output(name, N);
printf("\nsorting...\n");
bubble_sort(name, N);
printf("\nprint the list with the dictionary order:\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]);
}
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#include<cstdio>
#include<string.h>
#define N 100
char line[N];
bool num[10],flag;
void zero()
{
int i;
for(i=0;i<=9;i++)
num[i]=0;
flag=0;
}
int main()
{
int i;
while(gets(line) != NULL)
{
for(i=0;line[i]!='\0';i++)
{
if(!num[line[i]-'0'])
num[line[i]-'0']=1;
else
{
flag=1;
printf("YES\n");
break;
}
}
if(!flag)
printf("NO\n");
zero();
}
return 0;
}
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#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 i,t;
for(i=0;i<n;i++)
{
t=x[i][n-1];
x[i][n-1]=x[i][0];
x[i][0]=t;
}
}
int main() {
int t[][N] = {{21, 12, 13, 24},
{25, 16, 47, 38},
{29, 11, 32, 54},
{42, 21, 33, 10}};
printf("native:\n");
output(t, M); // 函数调用
rotate_to_right(t, M);
printf("after:\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");
}
}
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