#import <Foundation/Foundation.h>
//数组遍历（枚举）对集合中的元素依此不重复的进行遍历
int main(int argc, const char * argv[]) {
@autoreleasepool {
NSArray *arr=@[@"MON",@"TUE",@"WED",@"THU",@"FRI",@"SAT",@"SUN"];
//下标遍历
for (int i=0; i<[arr count]; i++) {
NSString *element=[arr objectAtIndex:i];
NSLog(@"%@",element);
}
NSLog(@" ");
for (int i=0; i<[arr count]; i++) {
NSLog(@"%@",arr[i]);
}
NSLog(@" ");
//for in 遍历性高
for (NSString *str in arr) {
NSLog(@"%@",str);
}
NSLog(@" ");
//id当 不确定数组元素的类型时，选择使用de
//id NSObject instancetype
for (id str in arr) {
NSLog(@"%@",str);
}
}
return 0;
}