About the flashback, descending order of the array, whether the directory contains files, Chinese sort, etc.

int main (int argc, const char * argv[]) {

@autoreleasepool {

/* 1th Please store the following data in a dictionary and output the dictionary content as a string output: "xxx, age xxx, subject xxx, score xxx" (replace XXX with the corresponding data).

*/

NSString *name = @ "Zhang San";

Nsinteger age = 22;

NSNumber *[email protected];

NSString *subject = @ "Mathematics";

NSLog (@ "The first question");

NSString *name = @ "Zhang San";

Nsinteger age = 22;

NSNumber *[email protected];

NSString *subject = @ "Mathematics";

Nsdictionary *[email protected]{@ "name": Name,

@ ' age ': @ (age),

@ "Score": Score,

@ "subject": Subject};

NSString *str=[nsstring stringwithformat:@ "%@, age%@ years, subjects%@, score%@", dic[@ "name"],dic[@ "ages"],dic[@ "subject"],dic[@ " Score "];

NSLog (@ "%@", str);

}

NSNumber *[email protected];

NSNumber *[email protected];

NSNumber *[email protected];

NSNumber *[email protected];

NSNumber *[email protected];

Nsarray *brr=[nsarray arraywithobjects:a,b,c,d,e, nil];

NSLog (@ "second question");

2nd question: 12,9,34,56,11 deposit Nsarray Array, output: 1) Reverse output 2) descending output

NSLog (@ "Reverse output method one");

Nsarray *[email protected][@12,@9,@34,@56,@11];

For (Nsinteger i=[arr1 count]-1;i>=0;i--) {

NSLog (@ "%@", Arr1[i]);

}

NSLog (@ "Reverse output Method II");

nsarray* REVERSEDARRAY=[[BRR reverseobjectenumerator]allobjects];

For (ID str2 in Reversedarray)

{

NSLog (@ "%@", str2);

}

NSLog (@ "descending sort");

Nscomparator comp=^ (ID obj1,id obj2) {

Nscomparisonresult Result=[obj2 Compare:obj1];

return result;

};

Nsarray *sortedarr=[arr1 Sortedarrayusingcomparator:comp];

For (ID i in Sortedarr) {

NSLog (@ "%@", I);

}

NSLog (@ "3rd" to determine whether the intermediate directory exists ");

/* Question 3rd to determine if the intermediate directory exists

such as passing strings @ "/home/qianfeng/oc.txt" and @ "Qianfeng"

return: YES

Incoming string @ "/usr/qianfeng/oc.txt and @" Fengqian "

return: NO

*/

NSString *[email protected] "/home/qianfeng/oc.txt";

Nsrange rang1=[str rangeofstring:@ "Qianfeng"];

if (rang1.location==nsnotfound) {

NSLog (@ "not found");

}

else{

NSLog (@ "found at Loacation:%ld", rang1.location);

}

Nsrange rang2=[str rangeofstring:@ "Fengqian"];

if (rang2.location==nsnotfound) {

NSLog (@ "not found");

}

else{

NSLog (@ "found at Loacation:%ld", rang2.location);

}

NSLog (@ "4th" array of elements in Chinese sort);

/* The elements in the array 4th sorted by Chinese

*/

Nsarray *[email protected][@ "Light Rain", @ "Ann", @ "small wind", @ "Rongrong", @ "Zhang Tao" @ "Li Wenrong"];

Nsarray *sortedarr2=[arr sortedarrayusingselector: @selector (localizedcompare:)];

For (NSString *str in sortedArr2) {

NSLog (@ "%@", str);

}

return 0;

}

About the flashback, descending order of the array, whether the directory contains files, Chinese sort, etc.