Objective-C学习——布尔类型

Objective-C学习——布尔类型

参照书中关于布尔类型实例，敲出下面代码

#import<Foundation/Foundation.h>

//比较两个整数是否相等

BOOL areIntsDifferent(int num1,int num2){

if (num1==num2) {

return (NO);

}else {

return (YES);

}

//将BOOL值转为相应的NSString类型

NSString *boolString(BOOL noYes){

if (noYes==NO) {

return (@"NO");

}else {

return (@"YES");

}

}

//在main函数中调用上面方法

int main (int argc,constchar * argv[]) {

    BOOL areTheyDifferenr;

areTheyDifferenr=areIntsDifferent(5,5);

NSLog(@"are %d and %d different? %@",5,5,boolString(areTheyDifferenr));

areTheyDifferenr=areIntsDifferent(23,42);

NSLog(@"are %d and %d different? %@",23,42,boolString(areTheyDifferenr)); 

    return0;

}

运行结果：

总结：Objective-C中的BOOL类型与C和JAVA很像，用法也比较简单，需要注意的是Objective-C的BOOL类型是YES值和NO值，而不是true和false。