数组求和、最大值、最小值、平均值

数组内容

NSArray*value =@[

@"35.19",@"30.97",@"33.24",@"40.41",@"48.21",

@"55.15",@"85.81",@"93.49",@"99.75",@"91.76",

@"147.72",@"140.19",@"169.67",@"183.78",@"192.18",

@"183.58",@"189.89"];

1.第一种

NSNumber*sum = [valuevalueForKeyPath:@"@sum.floatValue"];

NSNumber*avg = [valuevalueForKeyPath:@"@avg.floatValue"];

NSNumber* max =[valuevalueForKeyPath:@"@max.floatValue"];

NSNumber* min =[valuevalueForKeyPath:@"@min.floatValue"];

NSLog(@"sum = %.2f,\navg = %.2f,\nmax = %.2f,\nmin = %.2f",[sum floatValue],[avg floatValue],[max floatValue],[min floatValue]);

结果

sum = 1820.99,

avg = 107.12,

max = 192.18,

min = 30.97

2.第二种

NSArray*aa = [valuesortedArrayUsingComparator:^NSComparisonResult(id_Nonnullobj1,id_Nonnullobj2) {

if([obj1integerValue] > [obj2integerValue]) {

return(NSComparisonResult)NSOrderedDescending;

}

if([obj1integerValue] < [obj2integerValue]) {

return(NSComparisonResult)NSOrderedAscending;

}

return(NSComparisonResult)NSOrderedSame;

}];

3.第三种

NSArray*a = [valuesortedArrayWithOptions:NSSortStableusingComparator:^NSComparisonResult(id_Nonnullobj1,id_Nonnullobj2) {

if([obj1integerValue] > [obj2integerValue]) {

return(NSComparisonResult)NSOrderedDescending;

}

if([obj1integerValue] < [obj2integerValue]) {

return(NSComparisonResult)NSOrderedAscending;

}

return(NSComparisonResult)NSOrderedSame;

}];

4.第四种

NSArray*a = [valuesortedArrayWithOptions:NSSortStableusingComparator:^NSComparisonResult(id_Nonnullobj1,id_Nonnullobj2) {

return[[NSNumbernumberWithFloat:[obj1floatValue]]compare:[NSNumbernumberWithFloat:[obj2floatValue]]];

}];

5.第五种

NSArray*a = [valuesortedArrayWithOptions:NSSortStableusingComparator:^NSComparisonResult(id_Nonnullobj1,id_Nonnullobj2) {

return[obj1compare:obj2options:NSNumericSearch];

}];