IBokan_ios80_2

/*

:operation 运算(中文释义)
:count 计数	(中文释义)
:函数sqrt();求一个数的开平方.
:%g 可以打印输出double类型的数据,并且能去掉结果多余的0.

*/

#import <Foundation/Foundation.h>

int main()
{

int a1 = 1;
int a2 = 2;
int sum = 0;

sum = a1 + a2;

printf("sum = %d\n",sum);

sum = a1 - a2;

printf("sum = %d\n",sum);

sum = a1 % a2;

printf("sum = %d\n",sum);

sum = a2 * a2;

printf("sum = %d\n",sum);

sum = a1 / a2;

printf("sum = %d\n",sum);

sum = a1*a1 + a2*a2*a2;

printf("sum = %d\n",sum);

sum = (a1 + a2) * a2 / a1 % a1;

printf("sum = %d\n",sum);

//计算某个数得平方根用 sqrt()

double d1 = 16.0;

double d2 = sqrt(d1);

printf("打印结果是%lf\n",d2);

//去掉打印结果多余0的方法,apple SDK提供的 %g 来实现
//%g 可以打印double类型的数据,并且去掉多余的0.

printf("打印结果是%g\n",d2);

//计算练习题

double i = 80.0;
double j = 32.0;
double k = sqrt(i*i*i) - sqrt(j*j*j);
printf("k = %g\n",k);

//sizeof()  用来查看数据在内存中所占的字节数.

return 0;

}