C Language Code Abstraction Techniques

Dec 14, 2024#C语言 #抽象代码 #抽象技巧 #C45

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The content discusses various programming concepts, including: 1. A recursive function to implement addition using a full adder. 2. Modifying array operations in a one-dimensional array. 3. Converting an integer to a character using bitwise operations. The focus is on demonstrating abstract programming techniques to enhance problem-solving skills.

Make You More Indispensable (More Abstract)#

1. Full Adder Replaces Addition#

int add(int a, int b){
	if(!a) return b;
	return add((a & b) << 1, a ^ b);
}

2. Use More Approximation Symbols#

int i = 100;
do{
	//something
}while(i --> 0);

3. Change Array Operations (One-dimensional)#

int a[5] = {1, 2, 3, 4, 5};
for(int i = 0;i < 5;i++){
	printf("%d\n", i[a]);
	printf("%d\n", (i - 1)[a + 1]);
}

4. Odd or Even Judgment#

int num = 11;
printf("%d\n", num % 2 == 0);
printf("%d\n", num & 1);

5. Use Hexadecimal Values (Representation of -1)#

0xffffffff

6. x * N#

x <<= 1; //x *= 2
x >>= 1; //x /= 2
x = (x << 1) + (x << 3); //x *= 10

7. Swap Variables (a ≠ b)#

int a = 2,b = 3;
a ^= b;
b ^= a;
a ^= b;

//or

a^=b^=a^=b

8. Not Equal [This Method May Have Issues]#

a ≠ b <=> a ^ b

9. int to char#

int a, b;
char ch;
ch = a ^ 48;
b  = ch ^ 48;