#include<stdio.h>

#include<stdlib.h>

void fun(char *c)

{

    char p[], *loc;

    loc = c;

    int i = ;

    while (*c != '\0')

    {

        if (*loc >=  && *loc <= )

        {

            printf("%c", *loc);

        }

        else if (*loc >= 'a'&&*loc <= 'z' || *loc >= 'A'&&*loc <= 'Z')

        {

            p[i++] = *loc;

        }

        else printf("字符串格式不对\n");

        loc++;

        c++;

    }

    p[i] = '\0';

    i = ;

    while (p[i] != '\0')

    {

        printf("%c", p[i++]);

    }

}

int main()

{

    char c[] = "h1ell2o3";

    fun(c);

    system("pause");

    return ;

}

#include<stdio.h>

#include<stdlib.h>

void fun(char *c)

{

    char *loc = (char*)malloc(strlen(c));

    strcpy(loc, c);

    int i = ;

    while (*loc != '\0')

    {

        if (*loc == ' ')

        {

            c[i++] = '%';

            c[i++] = '';

            c[i++] = '';

            c[i++] = '';

        }

        else

        {

            c[i++] = *loc;

        }

        loc++;

    }

    c[i] = '\0';

    printf("%s\n", c);

}

int main()

{

    char c[] = "hello   world   how    ";

    fun(c);

    system("pause");

    return ;

}

#include<stdio.h>

#include<stdlib.h>

#include<string.h>

void fun(char c[])

{

    char *s=(char*)malloc(strlen(c));

    strcpy(s,c);

    int i = ;

    while (*s != '\0')

    {

        if (*s != 'a') {

            c[i++] = *s;

        }

        s++;

    }

    c[i] = '\0';

    printf("%s", c);

}

int main()

{

    char c[] = "abcdaefaghiagkl";

    fun(c);

    system("pause");

    return ;

}

#include<stdio.h>

#include<stdlib.h>

#define N 100

int delete_elem(int arr[], int new_arr[])

{

    int i = , new_arr_len = ;

    int flag[N] = {  };//对每个元素做一个初始标记

    for (i = ; i < ; i++)

    {

        if (flag[arr[i]] == )

        {

            new_arr[new_arr_len++] = arr[i];

            flag[arr[i]] = ;//出现过则标记属性设为1

        }

    }

    return new_arr_len;

}

void main()

{

    int i, arr[N] = {,,,,,,,,,,,,,,};

    int new_arr[N];

    int arr_len = ;//输入number的个数

    int new_arr_len;

    new_arr_len = delete_elem(arr, new_arr);

    printf("\n");

    printf("new array is :\n");

    for (i = ; i < new_arr_len; i++)

    {

        printf("%d ", new_arr[i]);

    }

    printf("\n");

    system("pause");

}

#include<stdio.h>

#include<stdlib.h>

#include<string.h>

void fun(char c[])

{

    int cnt = ;

    char *s = (char*)malloc(strlen(c));

    strcpy(s, c);

    int i = ;

    while (*s != '\0')

    {

        if (*s != ' ') {

            c[i++] = *s;

            cnt = ;

        }else {

            cnt++;

            if(cnt==)c[i++]=' ';

        }

        s++;

    }

    c[i] = '\0';

    printf("%s", c);

}

int main()

{

    char a[] = { "   hello    world   how are you  " };

    fun(a);

    system("pause");

    return ;

}

#include<stdio.h>

#include<string.h>

#define MAX 100

int main()

{

    int num1[], num2[];

    memset(num1, , sizeof(num1));

    memset(num2, , sizeof(num2));//将这些数组清零

    char *str1 = "";//用于保存键盘输入的两个待加大整数

    char *str2 = "";

    int len1, len2, i, j;

    len1 = strlen(str1);

    len2 = strlen(str2);

    j = ;

    int max = len1 > len2 ? len1 : len2;

    for (i = len1 - ; i >= ; i--)

        num1[j++] = str1[i] - '';        /*字符串反转并且转换为数字保存到数组里面*/

    j = ;

    for (i = len2 - ; i >= ; i--)

        num2[j++] = str2[i] - '';

    for (i = ; i < max; i++)

    {

        num2[i] += num1[i];//相加

        if (num2[i] >= )

        {

            num2[i] -= ;

            num2[i + ] += ;//产生进位

        }

    }

    if (num2[max]) printf("%d", num2[max]);//如果最高位产生进位

    for (i = max - ; i >= ; i--)

        printf("%d", num2[i]);

    printf("\n");

    system("pause");

    return ;

}

#include<stdio.h>

#include<stdlib.h>

#include<string.h>

void big(char *arr[], int size, char** big1, char** big2)

{

    int i = , j = ;

    char* max, *min, (*tmp)[] = arr;

    *big1 = tmp[];

    printf("%s\n", *big1);

    for (i = ; i < size; i++)

    {

        printf("%s ", tmp[i]);

    }

    printf("\n");

    for (j = ; j < size; j++)

    {

        //printf("\n%s %s\t", arr[i], arr[i + 1]);

        if (strcmp(*big1, tmp[j]) < ) {

            strcpy(*big2, *big1);

            strcpy(*big1, tmp[j]);

        }

    }

    printf("\n---------------------------------\n");

    printf("the biggest string is %s\n", *big1);

    printf("the bigger string is %s\n", *big2);

}

int main()

{

    char arr[][] = { "hdua","dade","heoc","das3" ,"heod" };

    char *big1 = (char*)malloc(), *big2 = (char*)malloc(), (*a)[] = (char*)malloc();

    a = arr;

    big(arr, , &big1, &big2);

    system("pause");

    return ;

}