#include <stdio.h>
int main()
{
int arr[3][3] = {{1,2,3},{4,5,6},{7,8,9}};
int i,j;
int sum=0;
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
if((i+j+2)%2==0)
{
sum+=arr[i][j];
}
}
}
printf("對角線元素之和是:%d\n",sum);
return 0;
}
int main()
{
int arr[3][3] = {{1,2,3},{4,5,6},{7,8,9}};
int i,j;
int sum=0;
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
if((i+j+2)%2==0)
{
sum+=arr[i][j];
}
}
}
printf("對角線元素之和是:%d\n",sum);
return 0;
}
2021-10-14
#include<stdio.h>
int main()
{
int a,b,sum;
sum = 0;
for(a = 1,b = 2;a<100,b<=100;a+=2,b+=2)
{
sum = sum + a - b;
}
printf("sum=%d\n",sum);
return 0;
}
int main()
{
int a,b,sum;
sum = 0;
for(a = 1,b = 2;a<100,b<=100;a+=2,b+=2)
{
sum = sum + a - b;
}
printf("sum=%d\n",sum);
return 0;
}
2021-10-14
#include <stdio.h>
int getWordNumber(int n)
{
int a;
if(n == 1)
{
return 1;
}
else
{
a=getWordNumber(n-1)+n ;
printf("第%d天記了%d個單詞\n",n,a);
return a;
}
}
int main()
{
int n=10;
printf("小明第10天記了:%d個單詞。\n",getWordNumber(n) );
return 0;
int getWordNumber(int n)
{
int a;
if(n == 1)
{
return 1;
}
else
{
a=getWordNumber(n-1)+n ;
printf("第%d天記了%d個單詞\n",n,a);
return a;
}
}
int main()
{
int n=10;
printf("小明第10天記了:%d個單詞。\n",getWordNumber(n) );
return 0;
2021-10-13
char s1[100]="";
char s2[]="我愛,";
char s3[]="學(xué)習(xí)";
strcat(s2,s3);
printf("%s\n",s2,s3);
return 0;
char s2[]="我愛,";
char s3[]="學(xué)習(xí)";
strcat(s2,s3);
printf("%s\n",s2,s3);
return 0;
2021-10-11
(arr[i]==value)
{
return i;
}
}
return index;
}
int main()
{
int arr[5]={3,12,9,8,6};
int value = 8;
int index =getIndex(arr,value);
if(index!=-1)
{
printf("%d在數(shù)組中存在,下標(biāo)為 %d\n",value,index);
}
else
{
printf("%d在數(shù)組中不存在.\n",value);
}
return 0;
}
{
return i;
}
}
return index;
}
int main()
{
int arr[5]={3,12,9,8,6};
int value = 8;
int index =getIndex(arr,value);
if(index!=-1)
{
printf("%d在數(shù)組中存在,下標(biāo)為 %d\n",value,index);
}
else
{
printf("%d在數(shù)組中不存在.\n",value);
}
return 0;
}
2021-10-09
for(j=0;j>=0;j++)
{
if(arr[j]>arr[j+1]) //當(dāng)前面數(shù)比后面的數(shù)大時
{
double temp; //定義臨時變量temp
temp = arr[j]; //講前面的數(shù)賦值給temp
arr[j] = arr[j+1]; //前后之?dāng)?shù)顛倒位置
arr[j+1] =t
{
if(arr[j]>arr[j+1]) //當(dāng)前面數(shù)比后面的數(shù)大時
{
double temp; //定義臨時變量temp
temp = arr[j]; //講前面的數(shù)賦值給temp
arr[j] = arr[j+1]; //前后之?dāng)?shù)顛倒位置
arr[j+1] =t
2021-10-08