无法从“const char [19]”转换为“char *”问题

在VS2017中遇到将字符串常量赋值给字符指针导致的编译错误。解决方法是在报错语句前添加`const`,但随后会遇到`reinterpret_cast`转换问题。需要使用`const_cast`去除只读属性,然后进行类型转换。

VS2017中无法将字符串常量赋值给字符指针的问题

编写C++程序
如 char *p1 = "hello wangbaoming "; 会报错!

关于类型转换的例程:

#include <iostream>
using namespace std;

int main()
{
   
   
	double dPi = 3.1415926;

	//1静态的类型转换:  在编译的时 进行基本类型的转换 能替代c风格的类型转换 可以进行一部分检查
	int num1 = static_cast<int> (dPi); //c++的新式的类型转换运算符  
	int num2 = (int)dPi;				//c语言的 旧式类型转换 
	int num3 = dPi;						//隐士类型转换
	cout << "num1:" << num1 << 
/*-------------------------------------------------------------------------- STRING.H String functions for C251 Version 4. Copyright (c) 1995-2007 Keil Elektronik GmbH and Keil Software, Inc. All rights reserved. --------------------------------------------------------------------------*/ #pragma SAVE #pragma PARM251 #ifndef _SIZE_T #define _SIZE_T typedef unsigned int size_t; #endif #ifndef NULL #define NULL ((void *) 0L) #endif #if (__C251__ >= 200) extern char *strcat (char *s1, const char *s2) reentrant; extern char *strncat (char *s1, const char *s2, size_t n) reentrant; extern char strcmp (const char *s1, const char *s2) reentrant; extern char strncmp (const char *s1, const char *s2, size_t n) reentrant; extern char *strcpy (char *s1, const char *s2) reentrant; extern char *strncpy (char *s1, const char *s2, size_t n) reentrant; extern size_t strlen (const char *) reentrant; extern char *strchr (const char *s, char c) reentrant; extern int strpos (const char *s, char c) reentrant; extern char *strrchr (const char *s, char c) reentrant; extern int strrpos (const char *s, char c) reentrant; extern size_t strspn (const char *s, const char *set) reentrant; extern size_t strcspn (const char *s, const char *set) reentrant; extern char *strpbrk (const char *s, const char *set) reentrant; extern char *strrpbrk (const char *s, const char *set) reentrant; extern char memcmp (const void *s1, const void *s2, size_t n) reentrant; extern void *memcpy (void *s1, const void *s2, size_t n) reentrant; extern void *memchr (const void *s, char val, size_t n) reentrant; extern void *memccpy (void *s1, const void *s2, char val, size_t n) reentrant; extern void *memmove (void *s1, const void *s2, size_t n) reentrant; extern void *memset (void *s, char val, size_t n) reentrant; extern void far *fmemset (void far *s, char val, unsigned int n) reentrant; extern void xdata *xmemset (void xdata *s, char val, unsigned int n) reentrant; extern void far *fmemcpy (void far *s1, void far *s2, unsigned int n) reentrant; extern void xdata *xmemcpy (void xdata *s1, void xdata *s2, unsigned int n) reentrant; extern unsigned long hstrlen (const char huge *s) reentrant; extern char hstrcmp (const char huge *s1, const char huge *s2) reentrant; extern char huge *hstrcpy (char huge *s1, const char huge *s2) reentrant; #pragma PARM4 // allow a maximum of 4 long as register parameters extern char huge *hstrncpy (char huge *s1, const char huge *s2, unsigned long n) reentrant; extern char hmemcmp (const void huge *s1, const void huge *s2, unsigned long len) reentrant; extern void huge *hmemcpy (void huge *s1, const void huge *s2, unsigned long len) reentrant; extern void huge *hmemchr (const void huge *ptr, char val, unsigned long len) reentrant; extern char huge *hmemccpy (char huge *dest, const char huge *src, char val, unsigned long len) reentrant; extern void huge *hmemmove (void huge *s1, const void huge *s2, unsigned long len) reentrant; extern void huge *hmemset (void huge *ptr, char val, unsigned long len) reentrant; #else extern char *strcat (char *s1, char *s2); extern char *strncat (char *s1, char *s2, int n); extern char strcmp (char *s1, char *s2); extern char strncmp (char *s1, char *s2, int n); extern char *strcpy (char *s1, char *s2); extern char *strncpy (char *s1, char *s2, int n); extern int strlen (char *); extern char *strchr (const char *s, char c); extern int strpos (const char *s, char c); extern char *strrchr (const char *s, char c); extern int strrpos (const char *s, char c); extern int strspn (char *s, char *set); extern int strcspn (char *s, char *set); extern char *strpbrk (char *s, char *set); extern char *strrpbrk (char *s, char *set); extern char memcmp (void *s1, void *s2, int n); extern void *memcpy (void *s1, void *s2, int n); extern void *memchr (void *s, char val, int n); extern void *memccpy (void *s1, void *s2, char val, int n); extern void *memmove (void *s1, void *s2, int n); extern void *memset (void *s, char val, int n); #endif #pragma RESTORE C:\Keil_v5\C251\Inc\string.h(22): error C25: syntax error near '"string"' 编译错误
最新发布
08-27
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