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;}