demo_3_17

#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
void fun(char *p)
{
    int i = 0;
    while (p[i])
    {
        if (p[i] == ' '&&islower(p[i - 1])) p[i - 1] = p[i - 1] - 'a' + 'A';
        i++;
    }
}
int main()
{
    char s1[100] = "ab cd EFG !";
    fun(s1);
    printf("%s\n", s1);
    system("pause");
    return 0;
}

int f(int x)
{
    int y;
    if (x == 0 || x == 1) return (3);
    y = x*x - f(x - 2);
    return y;
}
int main()
{
    int z;
    z = f(3);
    printf("%d\n", z);
    system("pause");
    return 0;
}

int fun(int x[], int n)
{
    static int sum = 0, i;
    for (i = 0; i < n; i++)
    {
        sum += x[i];
    }
    return sum;
}
int main()
{
    int a[] = { 1, 2, 3, 4, 5 }, b[] = { 6, 7, 8, 9 }, s = 0;
    s = fun(a, 5) + fun(b, 4);
    printf("%d\n", s);
    system("pause");
    return 0; 
}


#include <string.h>
struct A
{
    int a;
    char b[10];
    double c;
};
struct A f(struct A t);
int main()
{
    struct A a = { 1001, "ZhangDa", 1098.0 };
    a = f(a);
    printf("%d,%s,%6.1f\n", a.a, a.b, a.c);
    system("pause");
    return 0;
}
struct A f(struct A t)
{
    t.a = 1002;
    strcpy(t.b, "ChangRong");
    t.c = 1202.0;
    return t;
}


int main()
{
    FILE *fp;
    int k, n, a[6] = { 1, 2, 3, 4, 5, 6 };
    fp = fopen("d2.dat", "w");
    fprintf(fp, "%d%d%d\n", a[0], a[1], a[2]);
    fprintf(fp, "%d%d%d\n", a[3], a[4], a[5]);
    fclose(fp);
    fp = fopen("d2.dat", "r");
    fscanf(fp, "%d%d", &k, &n);
    printf("%d%d\n", k, n);
    fclose(fp);
    system("pause");
    return 0;
}

int main()
{
    int k = 5;
    while (--k)
    {
        printf("%d", k -= 3);
    }
    printf("\n");
    system("pause");
    return 0;
}

int main()
{
    int i, j;
    for (i = 3; i >= 1; i--)
    {
        for (j = 1; j <= 2; j++)
        {
            printf("%d ", i + j);
        }
        printf("\n");
    }
    system("pause");
    return 0;
}

int main()
{
    int k = 5, n = 0;
    do
    {
        switch (k)
        {
        case 1:
        case 3:n += 1; k--; break;
        default:n = 0; k--;
        case 2:
        case 4:n += 2; k--; break;
        }
        printf("%d ", n);
    } while (k > 0 && n < 5);
    system("pause");
    return 0; 
}


void f(int *q)
{
    int i = 0;
    for (; i < 5; i++) (*q)++;
}
int main()
{
    int a[5] = { 1, 2, 3, 4, 5 }, i;
    f(a);
    for (i = 0; i < 5; i++) printf("%d,", a[i]);
    system("pause");
    return 0;
}

struct S
{
    int n;
    int a[20];
};
void f(int *a, int n)
{
    int i;
    for (i = 0; i < n - 1; i++)
    {
        a[i] += i;
    }
}
int main()
{
    int i;
    struct S s = { 10, { 2, 3, 1, 6, 7, 5, 4, 10, 9 } };
    f(s.a, s.n);
    for (i = 0; i < s.n; i++)
    {
        printf("%d,", s.a[i]);
    }
    system("pause");
    return 0;
}


typedef struct
{
    char name[9];
    char sex;
    float score[2];
}STU;
void f(STU A)
{
    STU b = { "Zhao", 'm', 85.0, 90.0 };
    int i;
    strcpy(c.name, b.name);
    a.sex = b.sex;
    for (i = 0; i < 2; i++)
    {
        a.score[i] = b.score[i];
    }
}
int main()
{
    STU c = { "Qian", 'f', 95.0, 92.0 };
    f(c);
    printf("%s,%c,%2.0f,%2.0f\n", c.name, c.sex, c.score[0],c.score[1]);
    system("pause");
    return 0;
}

int main()
{
    char a = 4;
    printf("%d\n", a = a << 1);
    system("pause");
    return 0;
}

int main()
{
    int x = 12;
    double y = 3.141593;
    printf("%d%8.6f\n", x, y);
    system("pause");
    return 0;
}

int main()
{
    int i, j, x = 0;
    for (i = 0; i < 2; i++)
    {
        x++;
        for (j = 0; j <= 3; j++)
        {
            if (j % 2) continue;
            x++;
        }
        x++;
    }
    printf("%d\n", x);
    system("pause");
    return 0;
}