O-C-11-利用类方法做一个简单的计算器

#import <Foundation/Foundation.h>

@interface calculator :
NSObject

//@property  double    number;

+(void)texe;

+(void)add:(float)num1 andnum2:(float)num;

+(void)subtract:(float)num1 andnum2:(float)num2;

+(void)multiply:(float)num1 andnum2:(float)num2;

+(void)divice:(float)num1 andnum2:(float)num2;

@end

@implementation calculator

+(void)texe

{

NSLog(@"这是一个测试方法");

}

//加法

+(void)add:(float)num1 andnum2:(float)num2

{

NSLog(@"%.2f+%.2f=%.2f",num1,num2,num1+num2);

}

//减法

+(void)subtract:(float)num1 andnum2:(float)num2{

NSLog(@"%.2f-%.2f=%.2f",num1,num2,num1-num2);

}

//乘法

+(void)multiply:(float)num1 andnum2:(float)num2{

NSLog(@"%.2f*%.2f=%.2f",num1,num2,num1*num2);

}

//除法

+(void)divice:(float)num1 andnum2:(float)num2{

NSLog(@"%.2f ÷ %.2f=%.2f",num1,num2,num1/num2);

}

@end

int main(int argc,const
char * argv[]) {

@autoreleasepool {

//加法

[calculatoradd:12.3andnum2:12.3];

//减法

[calculatorsubtract:25andnum2:10];

//乘法

[calculatormultiply:12andnum2:2.5];

//除法

[calculatordivice:30andnum2:2];

}

return0;

}

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