//只需要列出表达式就可以                int F = 27;       //设置F为华氏温度，赋值 27        float C ;           //设置C为摄氏温度，类型为浮点类型                C = (F-32)/1.8;        NSLog(@"%.1f",C);     // %.1f 保留一位小数就可以     //输出结果       2014-09-17 14:58:48.259 prog1[6058:303] -2.8       Program ended with exit code: 0

        float x = 2.55 ,  result ;                result = 3 * (x * x * x) - 5 * (x * x) + 6 ;                NSLog(@"result is %f",result);       //结果如下      2014-09-17 15:11:11.064 prog1[6196:303] result is 23.231621

        //不知道这道题考的是什么 列出表达式过了得了        double result;                result = (3.31e-8 + 2.01e-7) / (7.16e-6 + 2.01e-8);                NSLog(@"result is %e",result);                //输出结果        2014-09-17 15:29:31.547 prog1[6274:303] result is 3.260400e-02        Program ended with exit code: 0

//-------------interface部分-----------@interface Complex : NSObject- (void) setReal: (double) a;            //设置实数- (void) setImaginary: (double) b;    //设置虚数- (void) print;                                 //打印结果- (double) real;- (double) imaginary;@end//--------------implementation部分----------------@implementation Complex{    double real;    double imaginary;}- (void) setReal: (double) a{    real = a;}- (void) setImaginary: (double) b{    imaginary = b;}- (void) print{    NSLog(@"The complex is %.f + %.fi", real, imaginary);}- (double) real{    return real;}- (double) imaginary{    return imaginary;}@end//----------------program部分-------------int main(int argc, const char * argv[]){    @autoreleasepool {        Complex * newComplex = [[Complex alloc]init];                [newComplex setReal:11];        [newComplex setImaginary:22];
//下面两个方法都可以 ，分别测试 print方法和 real,imaginary方法；（应题目要求）                [newComplex print];

  //      NSLog(@"The complex is %.f + %.fi",[newComplex real],[newComplex imaginary]);

           }    return 0;}//结果如下   2014-09-17 17:27:59.830 prog1[6678:303] The complex is 11 + 22i   Program ended with exit code: 0