筆記：long、longlong、int、float、NSString相互轉換

NSString *string = @"123";

// 1.字元串轉int
int intString = [string intValue];

// 2.int轉字元串
NSString *stringInt = [NSString stringWithFormat:@"%d",intString];

// 3.字元串轉float
float floatString = [string floatValue];

// 4.float轉字元串
NSString *stringFloat = [NSString stringWithFormat:@"%f",floatString];


  long longValue = 104024;    
// 5.long 型轉換字元串
 NSNumber *longNumber = [NSNumber numberWithLong:longValue];
NSString *longStr = [longNumber stringValue];
        
 // 6.long long 型轉換字元串
NSNumber *longlongNumber = [NSNumber numberWithLongLong:longValue];
NSString *longlongStr = [longlongNumber stringValue];

//7.字元串轉long
[str longLongValue];