#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=i;j<i+2;j++)
{
sum += arr[i][j];
}
}
printf("对角线元素之和是:%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=i;j<i+2;j++)
{
sum += arr[i][j];
}
}
printf("对角线元素之和是:%d\n",sum);
return 0;
}
2015-03-26
#include <stdio.h>
int main()
{
double num = 2.5; //定义浮点型变量num并赋值为2.5
printf("num的整数部分是%d\n", (int)num);
return 0;
}
int main()
{
double num = 2.5; //定义浮点型变量num并赋值为2.5
printf("num的整数部分是%d\n", (int)num);
return 0;
}
2015-03-26
//do-while循环
do{sum=sum+flag*i;
i++;
flag=-flag;
}while(i<=100);
i = 1; //重新初始化变量i
do{sum=sum+flag*i;
i++;
flag=-flag;
}while(i<=100);
i = 1; //重新初始化变量i
2015-03-25