iOS開發-Day12-C的複習

原創

2020-02-20 22:07

今天並沒有怎麼複習，但是對部分知識點做了一下回顧，還是發現了不少漏洞

1、定義數組時

static int arr[10];//數組中所有值爲0
int arr[10];//數組中值隨機
int arr[10]={0};//數組中所有值爲0
int arr[10]={1};//數組中初第一個元素都爲0

2、switch的參數可以爲int、 short、 char 或者 byte，還有enum

3、關於const和宏定義的區別並沒有掌握，詳細見day9

今天改進了萬年曆，更好看了一點，嘿嘿嘿

void wannianli(int year,int month,int day){
    int runyear=0,daycount=0;
    int allmonth[2][13]={{0,31,28,31,30,31,30,31,31,30,31,30,31},{0,31,29,31,30,31,30,31,31,30,31,30,31}};

    if ((year%4==0&&year%100!=0)||year%400==0) {
        runyear=1;
    }
    for (int i=1; i<=month; i++) {
        daycount+=allmonth[runyear][i-1];
    }
     //daycount+=day;//一年中第幾天
     //printf("%d \n",daycount);
     //printf("%d",year-1 + (year-1)/4 - (year-1)/100 + (year-1)/400);
    int monthweek[allmonth[runyear][month]];
    for (int i=0; i<allmonth[runyear][month]; i++) {
        monthweek[i]=(year-1 + (year-1)/4 - (year-1)/100 + (year-1)/400 + daycount+i+1)%7;
    }
    printf("% d.%d\n",year,month);
    printf("日\t一\t二\t三\t四\t五\t六\t\n");
    if (monthweek[0]!=0) {
        for (int i=0; i<monthweek[0]; i++) {
            printf("\t");
        }
    }
    for (int i=0; i<allmonth[runyear][month]; i++) {
        if (monthweek[i]==0) {
            monthweek[i]+=7;
        }

        printf("%d\t",i+1);

        if ((monthweek[i])%6==0) {
            printf("\n");
        }
    }
    printf("\n\n");
}

nt main(int argc, const char * argv[]) {
    @autoreleasepool {
        wannianli(2015,7,24);
        wannianli(2015,8,24);
        wannianli(2015,9,24);
    }
    return 0;
}