一.int转string 1.c++11标准增加了全局函数std::to_string: string to_string (int val); string to_string (long val); string to_string (long long val); string to_string (unsigned val); string to_string (unsigned long val); string to_string (unsigned long long val);int...
or NULL if strCharSet does not appear in string. If strCharSet points to a string of zero length, the function returns string 1.这其实就是个字符串查找函数,如果在string中存在strcharset,则返回string中首次出现strcharset的首地址, 如果strCharSet没有出现在string中则返回NULL。
#include<stdio.h>struct{char a;short b;int c;}HU;struct{char a;short b;int c;}HU2;intmain(){printf("%ld\n",sizeof(HU));typeof(HU)HU3;printf("%ld\n",sizeof(HU3));printf("%ld\n",sizeof(HU2));typeof(HU)*ptr1=&HU;typeof(HU)*ptr2=&HU3;ptr2->b=444;printf("%d\n...
注意:循环中使用了std::string::size_type ix = 0;请使用string内置类型size_type来操作。由于int型可能不够string的长度,所以内置类型size_type(实际能够觉得是unsigned)被创建,保证各机器的兼容性,避免溢出(和下标溢出可不是一回事)。 不论什么存储 string 的 size 操作结果的变量必须为 string::size_type 类型。
bytes 类型字符串在屏幕显示时,除了ascii字符外,其它字符无法以可读方式显示。 bytes 转字符串: byte_data.decode(encoding="utf-8") int 转 bytes 用int对象的to_bytes()方法 # int variable num = 7 # int to bytes num_bytes = num.to_bytes(2, byteorder='big') ...
long是long int 的简写。 取值范围:-2147483648 ~ +2147483647 (4 Bytes) 定义: int a = 0; //定义最好进行初始化 long a = 0; //上述两种定义相同。 (3)长整型long long (8字节) PS:1.C语言标准是这样规定的:int最少16位(2字节),long不能比int短,short不能比int长,具体位长由编译器开发商根据...
/* longstrg.c --打印较长的字符串*/ #include <stdio.h> int main(void) { printf("Here's one way to print a "); printf("long string.\n"); printf("Here's another way to print a long string.\n"); printf("Here's the newest way to print a " "long string.\n"); //ANSIC...
Byte value=bytes[i]; Byte high= (value &0xf0) >>4; Byte low= value &0xf; [hexString appendFormat:@"%x%x", high, low]; }//forreturnhexString; }4.NSString转int类型inta =[aStrinng intValue];5.uint8转NSData(占两位)+ (NSData *)byteFromUInt8:(uint8_t)val ...
NSString *str = @"AA21f0c1762a3abc299c013abe7dbcc50001DD";NSData* bytes = [str dataUsingEncoding:NSUTF8StringEncoding];Byte * myByte = (Byte *)[bytes bytes];NSLog(@"myByte = %s",myByte);
C/C++ : converting std::string to const char* I get the error : left of '.c_str' must have class/struct/union type is 'char *' C# to C++ dll - how to pass strings as In/Out parameters to unmanaged functions that expect a string (LPSTR) as a function parameter. C++ int to str...