const char * first_string = "Every morning I"; const char * second_string = "go to the library, eat breakfast, swim."; char final_string [200]; //Copies first string first strcpy(final_string, first_string); //Copies second string strncat(final_string, second_string[ text_positi...
string a = "hello";string b = "world";b = string.Copy(a);如果想使用CopyTo()这个方法的话是这样的 void CopyTo(int sourceIndex,//从源字符串第几个字符开始copy,第一个为0 char[] destination,//目标字符串的char数组 int destinationIndex,//从目标字符串char数组的第几个位置开始放 ...
strcpy()makes a copy, just like the name implies. it's perfectly legal to copy a string in to an array. When you make an initialization of an array such as: charmyarr[] ="hello"; * source );
情况一:NSString intmain(intargc,constchar*argv[]){@autoreleasepool{NSString*str1=[[NSString alloc]initWithFormat:@"123abcdefghijklmn"];NSString*str2=[str1 copy];NSMutableString*str3=[str1 mutableCopy];NSLog(@"%zd %zd %zd",str1.retainCount,str2.retainCount,str3.retainCount);NSLog(@"%p %p ...
DBMS_OUTPUT.PUT_LINE('学生记录条数: '||to_char(cnt)); --首先给联合数组赋值 for i IN 1..cnt loop vx_name(i):=to_char(i); end loop; --输出联合数组中的值 for i IN 1..cnt loop DBMS_OUTPUT.PUT_LINE(vx_name(i)); end loop; ...
@property(copy,nonatomic)NSMutableArray*data; 执行如下代码: #import<Foundation/Foundation.h>#import"MJPerson.h"intmain(intargc,constchar*argv[]){@autoreleasepool{MJPerson*p=[[MJPerson alloc]init];p.data=[NSMutableArray array];[p.data addObject:@"jack"];//报错[p.data addObject:@"rose"];...
2:可变 => 可变 (arrayM是可变的,用mutableCopy给aM 得出aM.class是NSArrayM ) 3:可变 => 不可变(aM是可变的,用copy给a 得出a.class是NSArrayI) 不可变数组的copy void copyDemo2() { NSArray *array = @[@(1), @(2)]; NSLog(@"%@ %p %@", array, array, array.class); ...
int sourceIndex,//为需要复制的字符起始位置char[] destination,//为目标字符数组int destinationIndex,//指定目标数组中的开始存放位置int count//指定要复制的字符个数。) stringstrSource ="changed";char[] destination = {'T','h','e','','i','n','i','t','i','a','l','','a','r',...
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printf("%s",x[19]); // Print last string from the string array (declared above under title "Declaring Variables"). printf("%c",x[19][99]); // Print last char from the last string in the string array. mystring[99] = 'z' // Change last character in mystring string to 'z' ...