demo_3_15

#define _CRT_SECURE_NO_WARNINGS 1
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
int main()
{
    int t = 0;
    while (printf("*"))
    {
        t++;
        if (t < 3) break;
    }
    system("pause");
    return 0;
}

int main()
{
    char a[20] = "cehiknqtw";
    char s[] = "fbla";
    int i, k, j;
    for (k = 0; s[k] != '\0'; k++)
    {
        j = 0;
        while (s[k] >= a[j] && a[j] != '\0') j++;
        for (i = j; i <=strlen(a)+k; i++)
        {
            a[i] = a[i + 1];
        }
        s[j] = s[k];
    }
    puts(a);
    system("pause");
    return 0;
}

int main()
{
    char s[80], c1, c2 = ' ';
    int i = 0, num = 0;
    gets(s);
    while (s[i] != '\0')
    {
        c1 = s[i];
        if (c1 != ' '&&c2 == ' ') num++;
        i++;
        c2 = c1;
    }
    printf("There are %d words.\n", num);
    system("pause");
    return 0;
}

int main()
{
    char a[] = "acegikm";
    char b[] = "bdfhjlnpq";
    char c[80], *p;
    int i = 0, j = 0, k = 0;
    while (a[i] != '\0'&&b[j] != '\0')
    {
        if (a[i] < b[j])
        {
            c[k] = b[j];
            i++;
        }
        else{
            c[k] = a[i];
            j++;
        }
        k++;
        c[k] = '\0';
        if (a[i] == '\0') p = b + j;
        else p = a + i;
        strcat(c, p);
        puts(c);
        system("pause");
        return 0;
    }
}

int main()
{
    char s[80];
    int i, j;
    gets(s);
    for (i = j = 0; s[i] != '\0'; i++)
    {
        if (s[i] != 'c') s[j++] = s[i];
        s[j] = '\0';
    }
    puts(s);
    system("pause");
    return 0;
}

int main()
{
    int a = 100, x = 10, y = 20, ok1 = 5, ok2 = 0;
    if (x < y)
    {
        if (y != 10)
        {
            if (!ok1)
            {
                a = 1;
            }
            else {
                if (ok2)
                {
                    a = 10;
                }
                a = -1;
            }
        }
    }
    printf("%d\n", a);
    system("pause");
    return 0;
}

int main()
{
    char *s1, *s2;
    printf("\n*s1=%15s*", "chinabeijing");
    printf("\n*s2=%-5s*", "chi");
    system("pause");
    return 0;
}

int main()
{
    int a = -2;
    printf("%81x", a);
    system("pause");
    return 0;
}

int main()
{
    long y = 23456;
    printf("y = %31x\n", y);
    printf("y = %81x\n", y);
    printf("y = %#81x\n", y);
    system("pause");
    return 0;
}

int main()
{
    int x, y, z;
    scanf("%d%d%d", &x, &y, &z);
    printf("x+y+z=%d\n", x + y + z);
    system("pause");
    return 0;
}

//从键盘输入一个字符串a，并在字符串中的最大的元素后边另外输入字符串b
int main()
{
    char a[80], b[] = "ab", max;
    int i = 1, j;
    printf("input a string:>");
    gets(a);
    puts(a);
    max = a[0];
    while (a[i])
    {
        if (a[i] > max)
        {
            max = a[i];
            j = i;
        }
        i++;
    }
    for (i = strlen(a) + strlen(b) - 1; i > j; i--)
    {
        a[i] = a[i - strlen(b)];
    }
    j = 0;
    i++;
    while (b[j])
    {
        a[i] = b[j];
        i++;
        j++;
    }
    puts(a);
    system("pause");
    return 0;
}

//从键盘输入两个字符串a和b，不用库函数，把b的前五个字符连接到字符串a中，若b的长度小于5，
//则把b中所有元素连接到a中
int main()
{
    char a[80], b[80];
    int i = 0, j;
    printf("input two strings:>");
    gets(a);
    gets(b);
    while (a[i]) i++;
    for (j = 0; j < 5 && b[j]; j++)
    {
        a[i++] = b[j];
    }
    a[i] = '\0';
    puts(a);
    system("pause");
    return 0;
}

//从键盘输入一个整数，用折半法查找该数在10个有序整型数组a中的位置，若不在a中则打印相关信息
int main()
{
    int a[10] = { 1, 3, 5, 7, 9, 11, 13, 15, 17, 19 }, top, bot, mid, m;
    printf("enter a integer:>");
    scanf("%d", &m);
    top = 0, bot = 9;
    while (top <= bot)
    {
        mid = (top + bot) / 2;
        if (a[mid] == m) break;
        else if (a[mid] > m) top = mid + 1;
        else bot = mid - 1;
    }
    if (top <= bot) printf("found!position is %d.\n", mid);
    else printf("not found %d.\n", m);
    system("pause");
    return 0;
}

//数组a包括10个整数，把a中所有的后项÷前项的商取整=b，按照每行3个元素输出数组b
#define N 10
int main()
{
    int a[N], b[N], i;
    printf("enter %d integer data:> ",N);
    //从键盘上输入10个整数
    for (i = 0; i < N; i++)
    {
        scanf("%d", &a[i]);
    }
    //把a中所有的后项÷前项的商取整=b
    for (i = 1; i < N; i++)
    {
        b[i] = a[i] / a[i - 1];
    }
    //按照每行3个元素输出数组b
    for (i = 1; i < N; i++)
    {
        printf("%3d", b[i]);
        if (i % 3 == 0) printf("\n");
    }
    system("pause");
    return 0;
}


//循环一个5×5的二维数组，赋值1-25的自然数，输出数组的左下半三角
int main()
{
    int a[5][5], i, j, n = 1;
    //循环一个5×5的二维数组
    for (i = 0; i < 5; i++)
    {
        for (j = 0; j < 5; j++)
        {
            //赋值1-25的自然数
            a[i][j] = n++;
        }
    }
    printf("the result is:>\n");
    //输出数组的左下半三角的值
    for (i = 0; i < 5; i++)
    {
        for (j = 0; j < 5; j++)
        {
            printf("%4d", a[i][j]);
        }
        printf("\n");
    }
    system("pause");
    return 0;
}

//通过赋初值按照行的顺序为一个2×3的二维数组赋值2 4 6……等偶数，按列的顺序输出该数组
int main()
{
    int i, j, a[2][3] = { { 2, 4, 6 }, { 8, 10, 12 } };
    printf("\n the result is:>\n");
    //行
    for (i = 0; i < 3; i++)
    {
        //列
        for (j = 0; j < 2; j++)
        {
            //以列的顺序输出
            printf("%4d", a[j][i]);
        }
        //换行
        printf("\n");
    }
    system("pause");
    return 0;
}

int main()
{
    char a[20] = "ab", b[20] = "cdef";
    int k = 0;
    strcat(a, b);//字符串追加
    while (a[k] != '\0')
    {
        b[k] = a[k];
        k++;
    }
    puts(b);
    system("pause");
    return 0;
}

typedef struct stu{
    char name[10];
    char gender;
    int score;
}STU;
void f(STU a, STU *b)
{
    *b = a;
    printf("%s,%c,%d", b->name, b->gender, b->score);
}
int main()
{
    STU a = { "Zhao", 'm', 290 }, b = { "Qian", 'f', 350 };
    f(a, &b);
    printf("%s,%c,%d\n", b.name, b.gender, b.score);
    system("pause");
    return 0;
}

struct person{
    char name[20];
    int age;
};
int main()
{
    struct person room[2] = { { "Wang", 19 }, { "Li", 20 } };
    printf("%s:%d\n", (room + 1)->name, room->age);
    system("pause");
    return 0;
}

struct S{
    int x, y;
};
int main()
{
    struct S data[3] = { 4, 3, 2, 0, 8, 1 };
    int i;
    for (i = 0; i < 3; i++)
    {
        printf("%d%d;", data[i].x, data[i].y >> 1);
    }
    printf("\n");
    system("pause");
    return 0;
}

typedef struct stu{
    char name[10];
    char gender;
    int score;
}STU;
void f(STU a, STU *b)
{
    a = *b;
    printf("%s,%c,%d", a.name, a.gender, a.score);
}
int main()
{
    STU a = { "Zhao", 'm', 290 }, b = { "Qian", 'f', 350 };
    f(a, &b);
    printf("%s,%c,%d\n", a.name, a.gender, a.score);
    system("pause");
    return 0;
}

int main()
{
    int i = 4;
    for (printf("%d", i); i < 2; i++) printf("%d", i);
    printf("\n");
    system("pause");
    return 0;
}

int main()
{
    int k;
    for (k = 2; k == 0;) printf("%d", k--);
    system("pause");
    return 0;
}

int k = 5;
void f(int *s)
{
    s = &k;
    *s = 7;
}
int main()
{
    int m = 3;
    f(&m);
    printf("%d,%d\n", m, k);
    system("pause");
    return 0;
}


void fun(int a[], int n)
{
    int i;
    for (i = 0; i < n; i++)
    {
        if (i % 3 == 0)
            a[i] -= n;
        else
            a[i] += n;
    }
}
int main()
{
    int c[5] = { 6, 7, 8, 9, 10 }, i;
    fun(c, 5);
    for (i = 0; i < 5; i++) printf("%d,", c[i]);
    printf("\n");
    system("pause");
    return 0;
}

int main()
{
    int x[] = { 8, 2, 6, 12, 5, 15 },f1,f2;
    int *p = x;
    f1 = f2 = x[0];
    for (; p <= x + 5; p++)
    {
        if (f1 < *p) f1 = *p;
        if (f2>*p) f2 = *p;
    }
    printf("%d,%d\n", f1, f2);
    system("pause");
    return 0;
}

int main()
{
    int x[3][4] = { 1, 3, 5, 7, 9, 11, 2, 4, 6, 8, 10, 12 };
    int(*p)[4] = x, k = 1, m, n = 0;
    for (m = 0; m < 2; m++)
    {
        n += *(*(p + m) + k);
    }
    printf("%d\n", n);
    system("pause");
    return 0;
}