从C转换到Python

从Hello World开始

C : Hello World！

#include <stdio.h>

int main()
{
    // say hello
    printf("Hello World!\n");
}

1- Compile 编译到机器码
2- Link 与各种库链接
3- Execute 执行目标程序

Python : Hello World!

def main():
	# say hello
	print("Hello World")

main()

1- Run! 跑代码

# say hello
print("Hello World!")

main都是太啰嗦，一行OK

帮高斯的同学回家

C : 帮高斯的同学回家

#include <stdio.h>

int main()
{
	int s, i;
	s = 0;
	// adding numbers 1 to 100
	for (i = 0; i < 100; i++)
	{
		s += (i + 1);
	}
	printf("Sum= %d",s);
}

Python : 也帮高斯的同学回家

s = 0
# adding numbers 1 to 100
for i in range(100):
	s += (i + 1)
print("Sum=", s)

检验素数

C : 检验素数

#include <stdio.h>
#include <math.h>

int main()
{
	int n, i, flag = 0;
	printf("Please input number:");
	scanf("%d", &n);
	for (i = 2; i < sqrt(n); i++)
		if(n % i == 0)
		{
			flag = 1;
			break;
		}
	if (flag == 1)
		printf("%d is NOT a prime number.", n);
	else
		printf("%d is a prime number.", n);

Python : 检验素数

from math import sqrt
n = int(input("Please input number:"))
for i in range(2, int(sqrt(n)));
	if n % i == 0:
		print(f"{n} is Not a prime number.")
		break
else:
	print(f"{n} is a prime number.")

打印一个朴素的三角形

C : 打印一个朴素的三角形

#include <stdio.h>

int main()
{
	int n, i, j;
	printf("Please input number:");
	scanf("%d", &n);
	for (i = 0; i < n; i++)
	{
		for (j = 0; j < i; j++)
			printf("*");
		printf("\n");
	}
}

Python : 打印一个朴素的三角形

n = int(input("Please input number:"))
for i in range(n):
	print("*" * i)