c学习第7天

约瑟夫环

 int people[ALL_NUM];
    int pos, people_num = ALL_NUM, step = 0;
    for (pos = 0; pos < ALL_NUM ;  pos++) {
        people[pos] = pos + 1;
    }
    pos = 0;
    while (people_num > 0)
    {
        if (people[pos]) {
            step++;
            
        }
        if (people[pos] && step == OUT_NUM) {
            printf("%d out 
", people[pos]);
            people[pos] = 0;
            people_num--;
        }
        pos++;
        if (pos == ALL_NUM) {
            pos = 0;
            
        }
        if (step == OUT_NUM) {
            step = 0;
        }
    }
    

有一段文本，将文本中的所有单词，存放到一个字符串数组中

 

int main ()
{
    char (*str1)[50] = malloc(50*10);
    int last_index = 0;
    int current_index = 0;
    
    int count = 10;
    int word_num = 0;
    char *str =" main Hello World by on Copyright (c) 2013年 All rights reserved.";
    while (*(str+current_index++) ==' ') {
        
    }
    printf("current = %d
", current_index);
    last_index = current_index-1;
    do {
        if (*(str+current_index) == ' '||*(str+current_index) == '') {
            memcpy(str1[word_num], str+last_index, current_index-last_index);
            last_index = current_index;
            word_num++;
            if (word_num == count) {
                count+=10;
                str1 = realloc(str1, 50*count);
            }
        }
    }while (*(str+current_index++));
    
    for (int i = 0; i < word_num; i++) {
        printf("%s ", str1[i]);
    }

    return 0;
}