study-cpp/readme.txt at main · wangzhengqiang/study-cpp · GitHub

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1. 编译如下：

g++ CHAPTER1-1.cpp -o CHAPTER1-1

g++ ./cpp_stl_guide_code/Chapter1/CHAPTER1-2.cpp -o ./build/CHAPTER1-2

./build/CHAPTER1-2 111 22344


g++ ./cpp_stl_guide_code/Chapter1/CHAPTER1-3.cpp -o ./build/CHAPTER1-3

./build/CHAPTER1-3


gcc ./cpp_stl_guide_code/Chapter2/CHAPTER2-1.c -o ./build/CHAPTER2-1

./build/CHAPTER2-1

gcc ./cpp_stl_guide_code/Chapter2/CHAPTER2-2.c -o ./build/CHAPTER2-2

./build/CHAPTER2-2

gcc ./cpp_stl_guide_code/Chapter2/CHAPTER2-4.c -o ./build/CHAPTER2-4

./build/CHAPTER2-4

gcc ./cpp_stl_guide_code/Chapter2/CHAPTER2-5.c -o ./build/CHAPTER2-5

./build/CHAPTER2-5

# Chapter5

gcc ./cpp_stl_guide_code/Chapter5/Chapter5-1.c -o ./build/Chapter5-1

gcc ./cpp_stl_guide_code/Chapter5/Chapter5-2.c -o ./build/Chapter5-2

gcc ./cpp_stl_guide_code/Chapter5/Chapter5-3.c -o ./build/Chapter5-3

gcc ./cpp_stl_guide_code/Chapter5/Chapter5-4.c -o ./build/Chapter5-4

gcc ./cpp_stl_guide_code/Chapter5/Chapter5-5.c -o ./build/Chapter5-5

#空指针应用
gcc ./cpp_stl_guide_code/Chapter5/Chapter5-6.c -o ./build/Chapter5-6
./build/Chapter5-6
str1=111saaac len=8

#空字符串

gcc ./cpp_stl_guide_code/Chapter5/Chapter5-7.c -o ./build/Chapter5-7
./cpp_stl_guide_code/Chapter5/Chapter5-7.c: In function ‘main’:
./cpp_stl_guide_code/Chapter5/Chapter5-7.c:6:39: warning: implicit declaration of function ‘strlen’ [-Wimplicit-function-declaration]
    6 |   printf("str=%s &len=%d ", str, (int)strlen(str));
      |                                       ^~~~~~
./cpp_stl_guide_code/Chapter5/Chapter5-7.c:2:1: note: include ‘<string.h>’ or provide a declaration of ‘strlen’
    1 | #include <stdio.h>
  +++ |+#include <string.h>
    2 | //#include <string.h>
./cpp_stl_guide_code/Chapter5/Chapter5-7.c:6:39: warning: incompatible implicit declaration of built-in function ‘strlen’ [-Wbuiltin-declaration-mismatch]
    6 |   printf("str=%s &len=%d ", str, (int)strlen(str));
      |                                       ^~~~~~
./cpp_stl_guide_code/Chapter5/Chapter5-7.c:6:39: note: include ‘<string.h>’ or provide a declaration of ‘strlen’

缺失string.h头文件；

./build/Chapter5-7
str= &len=0

#字符串反转

1. 例1：
gcc ./cpp_stl_guide_code/Chapter5/Chapter5-8.c -o ./build/Chapter5-8
./build/Chapter5-8
buf no inverse:abcdefg
buf:gfedcba
sh: 1: pause: not found

例如2：
gcc ./cpp_stl_guide_code/Chapter5/Chapter5-9.c -o ./build/Chapter5-9
./build/Chapter5-9
src no inverse1:abcdefg
Reversed  string:gfedcba
sh: 1: pause: not found

gcc ./cpp_stl_guide_code/Chapter5/Chapter5-10.c -o ./build/Chapter5-10
 ./build/Chapter5-10
Reversed string: olleh

例如3：改进：将逆序的结果存入一个全局变量，并进行打印

gcc ./cpp_stl_guide_code/Chapter5/Chapter5-8-1.c -o ./build/Chapter5-8-1
./build/Chapter5-8-1
buf no inverse:abcdefg
g_buf:gfedcba
sh: 1: pause: not found

改进：使用局部变量
gcc ./cpp_stl_guide_code/Chapter5/Chapter5-8-2.c -o ./build/Chapter5-8-2
./build/Chapter5-8-2
buf no inverse:abcdefg
g_buf:gfedcba
sh: 1: pause: not found


# Chapter6

g++ ./cpp_stl_guide_code/Chapter6/Chapter6-1.cpp -o ./build/Chapter6-1

#custom your exp
g++ ./cpp_stl_guide_code/Chapter6/Chapter6-3.cpp -o ./build/Chapter6-3
./build/Chapter6-3
My exception happened

g++ ./cpp_stl_guide_code/Chapter6/Chapter6-4.cpp -o ./build/Chapter6-4
./build/Chapter6-4
An exception occurred. Exception Nr. 20


g++ ./cpp_stl_guide_code/Chapter6/Chapter6-5.cpp -o ./build/Chapter6-5
./build/Chapter6-5
vector size = 0
extended vector size = 5
value of vec [0] = 0
value of vec [1] = 1
value of vec [2] = 2
value of vec [3] = 3
value of vec [4] = 4
value of v = 0
value of v = 1
value of v = 2
value of v = 3
value of v = 4

#函数模版()
g++ ./cpp_stl_guide_code/Chapter6/Chapter6-6.cpp -o ./build/Chapter6-6
./build/Chapter6-6
2
4
4

# 数组 指针 字符串应用
g++ ./cpp_stl_guide_code/Chapter6/Chapter6-7.cpp -o ./build/Chapter6-7
./cpp_stl_guide_code/Chapter6/Chapter6-7.cpp: In function ‘int main()’:
./cpp_stl_guide_code/Chapter6/Chapter6-7.cpp:9:16: warning: ISO C++ forbids converting a string constant to ‘char*’ [-Wwrite-strings]
    9 |   char *str1 = "abc";
      |                ^~~~~
./build/Chapter6-7
strcpy( str4, str1) : abc
strcpy( str4, str11) : dfj
strcpy( str4, str2) : 123
strcpy( str4, str4) : ccccc111

指针常量

int* const p1=new int(1);

常量指针

int const *p1=new int(1);
const int *p1=new int(1);

#指针操作
例1：
g++ ./cpp_stl_guide_code/Chapter6/Chapter6-8.cpp -o ./build/Chapter6-8
./build/Chapter6-8
var1 变量的地址： 0x7ffc29f1ab28
var2 变量的地址： 0x7ffc29f1ab2e

例2：

g++ ./cpp_stl_guide_code/Chapter6/Chapter6-9.cpp -o ./build/Chapter6-9
./build/Chapter6-9
Value of var variable:20
Address stored in ip variable:0x7ffddce80adc
Value of *ip variable:20


#C标准格式

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