Math Functions 常用函数
//指数运算
NSLog(@"%.f", pow(3,2) );//result 9
NSLog(@"%.f", pow(3,3) );//result 27
//开平方运算
NSLog(@"%.f", sqrt(16) );//result 4
NSLog(@"%.f", sqrt(81) );//result 9
//上舍入
NSLog(@"res: %.f", ceil(3.000000000001));//result 4
NSLog(@"res: %.f", ceil(3.00));//result 3
//下舍入
NSLog(@"res: %.f", floor(3.000000000001));//result 3
NSLog(@"res: %.f", floor(3.9999999));//result 3
floor函数：返回小于或者等于指定表达式的最大整数
//四舍五入
NSLog(@"res: %.f", round(3.5));//result 4
NSLog(@"res: %.f", round(3.46));//result 3
NSLog(@"res: %.f", round(-3.5));//NB: this one returns -4
//最小值
NSLog(@"res: %.f", fmin(5,10));//result 5
//最大值
NSLog(@"res: %.f", fmax(5,10));//result 10
//绝对值
NSLog(@"res: %.f", fabs(10));//result 10
NSLog(@"res: %.f", fabs(-10));//result 10
补充：移动开发 , IOS ,
