用于快速枚举的打印输出
Printout for fast enumeration
哪些代码行可以让我们通过快速枚举打印迭代而不重复前置语句?我的代码如下:
#import <Foundation/Foundation.h>
int main(int argc, const char * argv[]) {
@autoreleasepool {
// Create an empty mutable array
NSMutableArray *listGroceries = [NSMutableArray array];
// Add two dates to the array
[listGroceries addObject:@"Container of milk"];
[listGroceries addObject:@"Stick of butter"];
// Add yesterday at the beginning of the list
[listGroceries insertObject:@"Loaf of bread" atIndex:0];
// How many dates are in the array?
NSLog(@"There are %lu Groceries", [listGroceries count]);
for (NSDate *d in listGroceries) {
NSLog(@"My grocery list is: %@", d);
}
}
return 0;
}
代码的结果如下:
2015-03-26 14:05:42.553 Groceries[3131:129994] My grocery list is: Loaf of bread
2015-03-26 14:05:42.553 Groceries[3131:129994] My grocery list is: Container of milk
2015-03-26 14:05:42.553 Groceries[3131:129994] My grocery list is: Stick of butter
如何让程序生成以下内容而不在之后每一行都重复 My grocery list is
:
My grocery list is:
Loaf of bread
Container of milk
Stick of butter
这是你的答案:
int main(int argc, char * argv[]) {
@autoreleasepool {
// Create an empty mutable array
NSMutableArray *listGroceries = [NSMutableArray array];
// Add two dates to the array
[listGroceries addObject:@"Container of milk"];
[listGroceries addObject:@"Stick of butter"];
// Add yesterday at the beginning of the list
[listGroceries insertObject:@"Loaf of bread" atIndex:0];
// How many dates are in the array?
NSLog(@"There are %lu Groceries", [listGroceries count]);
printf("My grocery list is: \n");
for (NSString *d in listGroceries) {
printf("%s \n", d.UTF8String);
}
return 0;
}
}
哪些代码行可以让我们通过快速枚举打印迭代而不重复前置语句?我的代码如下:
#import <Foundation/Foundation.h>
int main(int argc, const char * argv[]) {
@autoreleasepool {
// Create an empty mutable array
NSMutableArray *listGroceries = [NSMutableArray array];
// Add two dates to the array
[listGroceries addObject:@"Container of milk"];
[listGroceries addObject:@"Stick of butter"];
// Add yesterday at the beginning of the list
[listGroceries insertObject:@"Loaf of bread" atIndex:0];
// How many dates are in the array?
NSLog(@"There are %lu Groceries", [listGroceries count]);
for (NSDate *d in listGroceries) {
NSLog(@"My grocery list is: %@", d);
}
}
return 0;
}
代码的结果如下:
2015-03-26 14:05:42.553 Groceries[3131:129994] My grocery list is: Loaf of bread
2015-03-26 14:05:42.553 Groceries[3131:129994] My grocery list is: Container of milk
2015-03-26 14:05:42.553 Groceries[3131:129994] My grocery list is: Stick of butter
如何让程序生成以下内容而不在之后每一行都重复 My grocery list is
:
My grocery list is:
Loaf of bread
Container of milk
Stick of butter
这是你的答案:
int main(int argc, char * argv[]) {
@autoreleasepool {
// Create an empty mutable array
NSMutableArray *listGroceries = [NSMutableArray array];
// Add two dates to the array
[listGroceries addObject:@"Container of milk"];
[listGroceries addObject:@"Stick of butter"];
// Add yesterday at the beginning of the list
[listGroceries insertObject:@"Loaf of bread" atIndex:0];
// How many dates are in the array?
NSLog(@"There are %lu Groceries", [listGroceries count]);
printf("My grocery list is: \n");
for (NSString *d in listGroceries) {
printf("%s \n", d.UTF8String);
}
return 0;
}
}