Description

Before doing this assignment, you should already know the following things:
• Define and Call a Function
• Recursion
• Namespace
• Multi-file compilation
Review Questions
(You should write the answers to the following questions in the same file)
1. Write the following functions
• Replace one char with another in a string(array of char) and return the number of replacements. Below is the function prototype in header file.
// replace all a in str with b, len is the length of the string int replace(char str[], int len, char a, char b);
• Convert Cartesian coordinates(x, y) to polar coordinates(ρ,θ), use sqrt(x) to find square root of x and atan(y) to find the inverse trigonometric, which is arctangent of y. Below is the struct and function prototype in header file.
// struct of cartesian coordinates struct Cartesian {
float x; float y;
};
// struct of polar coordinates struct Polar { float x; float y;
};
// Convert Cartesian coordinates to polar coordinates Polar cartesian2Polar(Cartesian pos);
2. Briefly describe the benefits of putting the function prototype in the header file.
Programing Exercise
1. Write a function which input a string(char array) and two numbers (let say a and b). The function should reverse all the item between and including the index a and b. And it returns a bool indecates if the input is valid. (You can define helper functions if needed)
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For example, input is “robomaster2022”, a=0 b=5, the returned bool is true and the string will be “amoborster2022”. If the input is a=5 b=0 then it is not valid, return false and the string remain the same.
2. Write a program that can output the first n numbers of Fibonacci sequence. For example, n=10, the first 5 numbers of Fibonacci sequence: 0, 1, 1, 2,
3, 5, 8, 13, 21, 34
We have provided the skeleton code (exer3_1.cpp and exer3_2.cpp), you only need to complete the calculation part. For compiling and running the code, using the following commend lines:
# compile g++ -o exer_run3_1 exer3_1.cpp g++ -o exer_run3_2 exer3_2.cpp
# run
./exer_run3_1
./exer_run3_2
If you want to know more about compiling with g++, click here
DO NOT FORGET TO COMMIT AND PUSH YOU CODE 🙂
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