#include <stdio.h>
int main()
{
int arr[3][3] = {{1,2,3},{4,5,6},{7,8,9}};
int i,j=2;
int sum=0;
for(i=0;i<3;i++)
{
if(i==j)
sum-=arr[i][j];
sum+=arr[i][i]+arr[i][j];
j--;
}
printf("對(duì)角線元素之和是:%d\n",sum);
return 0;
}
int main()
{
int arr[3][3] = {{1,2,3},{4,5,6},{7,8,9}};
int i,j=2;
int sum=0;
for(i=0;i<3;i++)
{
if(i==j)
sum-=arr[i][j];
sum+=arr[i][i]+arr[i][j];
j--;
}
printf("對(duì)角線元素之和是:%d\n",sum);
return 0;
}
2019-12-31
#include <stdio.h>
int main()
{
int height = 185;
//補(bǔ)全所有代碼
if(height>=180)
{
printf("%s\n","可以");
}
return 0;
}
int main()
{
int height = 185;
//補(bǔ)全所有代碼
if(height>=180)
{
printf("%s\n","可以");
}
return 0;
}
2019-12-29
char 字符串名稱[長(zhǎng)度] = "字符串值";
2、char 字符串名稱[長(zhǎng)度] = {'字符1','字符2',...,'字符n','\0'};
2、char 字符串名稱[長(zhǎng)度] = {'字符1','字符2',...,'字符n','\0'};
2019-12-26
首先要知道平年閏年的區(qū)分:閏年判定:能被400整除?;蛘吣鼙?整除但不能被100整除。否則其余的年份都為平年。
所以判斷條件是(year%400==0||year%4==0&&year%100!=0)
所以判斷條件是(year%400==0||year%4==0&&year%100!=0)
2019-12-25
#include <stdio.h>
int main()
{
double num = 2.5;
printf("num的整數(shù)部分是%d\n", (int)num);
return 0;
}
int main()
{
double num = 2.5;
printf("num的整數(shù)部分是%d\n", (int)num);
return 0;
}
2019-12-24
i = 1; //重新初始化變量i
//do-while循環(huán)
do{
i++;
sum+=i*flag; //sum=sun+i*flag
flag*=-1; //每運(yùn)行一次 flag變化 1 or -1
}while(i<=100);
//do-while循環(huán)
do{
i++;
sum+=i*flag; //sum=sun+i*flag
flag*=-1; //每運(yùn)行一次 flag變化 1 or -1
}while(i<=100);
2019-12-22