Extraction and substitution of strings in OC-four different methods of implementation

/* 1. The variable string @ "When I am young, I loved a girl in neighbor class." , extracted from Young to girl. Replace with @ "a teacher, I rather to teach student". */#import <foundation/foundation.h>int main (int argc, const char * argv[]) {@autoreleasepool {/* square        Law One *///nsmutablestring * str = @ "When I am young, I loved a girl in neighbor class."; /* nsmutablestring * str1 = [[nsmutablestring alloc]initwithstring:@] When I am young, I loved a girl in neighbor C        Lass. "];        [Str1 Replacecharactersinrange:nsmakerange (one, up) withstring:@ "a teacher, I rather to teach student"];        NSLog (@ "%@", str1); *//** Method Two first remove and insert */* nsmutablestring * str1 = [[nsmutablestring alloc]initwithstring:@] Whe        n I was young, I loved a girl in neighbor class. "];        [Str1 Deletecharactersinrange:nsmakerange (11,22)];        NSLog (@ "%@", str1);        [Str1 insertstring:@ "a teacher, I rather to teach student" atindex:11];        NSLog (@ "%@", str1); */* Method Three */* nsmutablestring * str1 = [[nsmutablestring alloc]initwithstring:@] when I am you        Ng, I loved a girl in neighbor class. "]; NSString * str2 = [str1 stringbyreplacingoccurrencesofstring:@ ' Young, I loved a girl ' withstring:@ ' a teacher, I rather to        Teach student "];        NSLog (@ "%@", str2); */* Method Four */nsmutablestring * str1 = [[nsmutablestring alloc]initwithstring:@] When I am young, I lov         Ed a girl in neighbor class. "];        nsmutablestring * str2=[str1 stringbyreplacingoccurrencesofstring:@ "Young, I loved a Girl" withstring:@ ""];        [str2 insertstring:@ "a teacher, I rather to teach student" atindex:11];            NSLog (@ "%@", str2); } return 0;}

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Extraction and substitution of strings in OC-four different methods of implementation