指针数组排序

数组倒序

#include
#include
#include

int main()
{
    char *str[4];
    char *ptr = "I am from shanghai";
    int i, j;

    for(i = 0; i < 4; i++)
    {
        str[i] = (char*)malloc(sizeof(char) * 20);
    }
    for(i = 0; i < 4; i++)
    {
        ptr++;
        for(j = 0; j < 20; j++)
        {
            if(*(ptr - 1) == ' ' || *(ptr - 1) == '\0')
            {
                break;
            }
            strncat(str[i] ,ptr - 1, 1);
            ptr++;
        }
    }
    for(i = 3; i >= 0; i--)
    {
        printf(" %s", str[i]);
    }
    printf("\n");
    return 0;
}

验证字符

int main()
{
    char str[30] = {0};
    char a[30] = {0};
    char b[30] = {0};
    printf("请输入一个字符串， 針头和针尾:\n");
    scanf("%s%s%s", str, a, b);

    char *ptr = str;
    char *a1 = a;
    char *b1 = b;
    char *a2 = NULL;

    int len_a, len_b, i;
    len_a = strlen(a);
    len_b = strlen(b);


    while(*ptr != '\0')
    {
        if(strncmp(ptr, a1, len_a) == 0)
        {
           a2 = ptr;
            while(*a2 != '\0')
            {
             if(strncmp(a2, b1, len_b) == 0)
             {
                   int sum = a2 - ptr + len_b;
                   for(i = 0; i < sum; i++)
                   {
                     printf("%c", *ptr);
                     ptr++;
                   }
             }
                   a2++;
             }
            }
             ptr++;
    }
    printf("\n");
    return 0;
}

数组指针排序（冒泡排序）

#include 
#include 
#include 

void fun(char **str);
int main()
{
    char *str[4];
    int i;

    str[0] = malloc(sizeof(char) * 10);
    str[1] = malloc(sizeof(char) * 10);
    str[2] = malloc(sizeof(char) * 10);
    str[3] = malloc(sizeof(char) * 10);

    printf("请输入四个字符串：\n");

    for(i = 0; i < 4; i++)
    {
        scanf("%s",str[i]);
    }

    fun(str);
                                            /*float a[5]={0};
                                              int i;
                                              int len=sizeof(a)/sizeof(a[0]);
                                              printf("please input 5 numbers:\n");
                                              for(i=0;i