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#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(@"\n");
for (int i=0; i<[arr count]; i++) {
NSLog(@"%@",arr[i]);
}
NSLog(@"\n");
//for in 遍历性高
for (NSString *str in arr) {
NSLog(@"%@",str);
}
NSLog(@"\n");
//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;
}
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原文地址:http://www.cnblogs.com/shaowenlong/p/5121733.html