数组

1.

初始化一个整形数组并遍历打印

    #include <stdio.h>

    int main(int argc, char *argv[])
    {
            int count[4] = {4, 3, 2, 1}, i;

            for (i = 0; i < 4; i++)
                    printf("count[%d] = %d\n", i, count[i]);

            return 0;
    }

2.

计算整形数组中奇数偶数的个数分别是多少

    /*
     * filename: even_odd.c
     *
     * function: get the number of even and the number of odd
     *
     * author: YourName
     *
     * version: 0.1
     *
     * date: 2011-10-26
     *
     * */

    #include <stdio.h>

    #define N 10

    int main(int argc, const char *argv[])
    {
            int num[N] = {1,2,3,4,5,6,7,8,9,11};
            int num_even = 0, num_odd = 0;
            int i;

            for (i = 0; i < N; i++)
            {
                    if ((num[i] % 2) == 0)
                            num_even++;
                    if ((num[i] % 2) == 1)
                            num_odd++;
            }

            printf("num of even is: %d\n", num_even);
            printf("num of odd is: %d\n", num_odd);

            return 0;
    }

3.

初始化一个字符数组并打印输出然后从键盘输入一个字符串并打印

    #include <stdio.h>
    #include <string.h>

    #define N 1024

    int main(int argc, const char *argv[])
    {
            char arr[N] = "hello akaedu!";

            printf("old = %s\n", arr);
            printf("sizeof(arr) = %d\n", sizeof(arr));
            printf("strlen(arr) = %d\n\n", strlen(arr));

            printf("Please input a string:");
            scanf("%s", arr);
            printf("new = %s\n", arr);

            return 0;
    }

4.

统计一下某字符串中指定字符出现的次数

    /*
     * filename: ch_in_str.c
     *
     * function: find hwo many the character in string
     *
     * author: YourName
     *
     * version: 0.1
     *
     * date: 2011-10-27
     *
     *
     */


    #include <stdio.h>

    #define LEN 20

    int main(int argc, char *argv[])
    {
            char str[LEN], c;
            int i, count = 0;

            scanf("%s %c", str, &c);

            for(i = 0; str[i]; i++)
                    if(str[i] == c)
                            count++;

            printf("find %d %c in %s\n", count, c, str);

            return 0;
    }

5.

删除字符串中出现的特定字符

    #include <stdio.h>

    #define N 1024

    void del_ch(char s[], char ch)
    {
            int i, j;

            for (i = j = 0; s[i]; i++)
            {
                    if (s[i] != ch)
                            s[j++] = s[i];
            }

            s[j] = '\0';

    }

    int main(int argc, const char *argv[])
    {
            char str[] = "hello akaedu!";
            char s[N];
            char ch;
                    
            del_ch(str, 'a');
            printf("After delete 'a', str = %s\n", str);

            printf("Please input string and character:");
            scanf("%s %c", s, &ch);
            printf("you have inputed s = %s, ch = %c\n", s, ch);
            del_ch(s, ch);
            printf("After delete '%c', s = %s\n", ch, s);

            return 0;
    }

6.

初始化一个二维数组并打印

    /*
     * filename: two_dimension.c
     *
     * function: initialize a two-dimension array and traverse it
     *
     * author: YourName
     *
     * version: 0.1
     *
     * date: 2011-10-27
     *
     */


    #include <stdio.h>

    #define N 5

    int main(int argc, const char *argv[])
    {
            int i, j;
            int arr[N][N] = 
                            {{1 ,2 ,3 ,4 ,5},
                             {6 ,7 ,8 ,9 ,10},
                             {11,12,13,14,15},
                             {16,17,18,19,20},
                             {21,22,23,24,25},};

            for (i = 0; i < N; i++)
            {
                    for (j = 0; j < N; j++)
                    {
                            printf("%3d", arr[i][j]);
                    }
                    printf("\n");
            }

            return 0;
    }