c语言数组那些骚事儿

找出最大和第二大值
#include <stdio.h>
#include <stdlib.h>
#include <time.h>


int main()
{
    int mynum[] = {43, 88, 56, 24, 78, 12, 8,29,57,80};
    int max=0;
    printf("%d
", max);
    int smax=0;
    printf("%d
", smax);
    if (mynum[0] > mynum[1])
    {
        max = mynum[0];
        smax = mynum[1];
    }
    else
    {
        max = mynum[1];
        smax = mynum[0];
    }
    for (int i = 2; i < 10; i++)
    {
        if (max < mynum[i])
        {
            smax = max;
            max = mynum[i];
        }
        else if ((mynum[i]<max) && (mynum[i]>smax))
        {        
            smax = mynum[i];
        }
    }
    printf("%d
",max);
    printf("%d
", smax);
    system("pause");
}

•  数组的逆序----思想是第一个和最后一个，第二个和倒数第二个

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main()
{
    int mynum[] = { 43, 88, 56, 24, 78, 12, 8, 29, 57, 80 };
    int cnt = sizeof(mynum) / 4;
    printf("%d
",cnt);
    for (int i = 0; i < cnt/2; i++)
    {
        int temp = mynum[i];
        mynum[i] = mynum[cnt - i - 1];
        mynum[cnt - i - 1] = temp;
    }
    for (int i = 0; i < 10; i++)
    {
        printf("%d,", mynum[i]);
    }
    system("pause");
    return EXIT_SUCCESS;
}

•  字符串逆序，------目前只能应用于中间带空格的英文字符串

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main()
{
    char mywords[] = "hello world";
    int cnt;
    cnt = sizeof(mywords)-1;
    printf("%d
",cnt);
    for (int i = 0; i < cnt/2; i++)
    {
        if (i == 6)
        {
        }
        else
        {
            char temp = mywords[i];
            mywords[i] = mywords[cnt - i - 1];
            mywords[cnt - i - 1] = temp;
        }
        
    }
    for (int i = 0; i < sizeof(mywords); i++)
    {
        printf("%c", mywords[i]);
    }
    system("pause");
    return EXIT_SUCCESS;
}