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wangzhengqiang/study-cpp

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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[] ) 

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