比较两个字符串大小

#import <Foundation/Foundation.h>

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

@autoreleasepool {

//比较两个字符串大小

NSString *str=[[NSString alloc]initWithString:@"a"];

NSString *str1=[[NSString alloc]initWithString:@"A"];

NSComparisonResult result= [str compare:str1];

// NSComparisonResult result= [str caseInsensitiveCompare:str1];

if (result==NSOrderedAscending) {

NSLog(@"str<str1");

}else if (result==NSOrderedDescending){

NSLog(@"str>str1");

}else{

NSLog(@"str=str1");

}

/*2.比较两个字符串内容是否相同

if (str==str1) {

NSLog(@"两个字符串内容相同");

}else{

NSLog(@"两个字符串内容不相同");

}

*/

/* //1.比较字符串对象是否相同

if ([str isEqualToString:str1]){

NSLog(@"两个字符串相同");

}else{

NSLog(@"两个字符串不相同");

}

*/

}

return 0;

}