C语言程序设计复习-创新互联

1.进制转换

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2.数据类型字节长度（P18）

3.赋值、逻辑表达式、与或非

#includeint main() {
    int a = 1;
    bool ans = (a == 1 and a == 0);
    printf("%d", ans);
}

4.除法、取模

#includeint main() {
	//除法：负负得正 
	printf("%d\t", 11 / -5);//-2
	printf("%d\t", -11 / 5);//-2
	printf("%d\n", -11 / -5);//2

	//取模：与被除数同号 
	printf("%d\t", 11 % -5);//1
	printf("%d\t", -11 % 5);//-1
	printf("%d\n", -11 % -5);//-1 
}

5.强制转换、浮点数

#includeint main() {
	float a = 10.0;
	int b = 1;
	printf("%f\t", a + b);
	printf("%f", a + (float)b);
}

6.运算符简写

#includeint main() {
	for (int i = 0; i< 5; i++) {
		printf("%d\t", i);
	}
	printf("\n");

	for (int i = 0; i< 5; ++i) {
		printf("%d\t", i);
	}
	printf("\n");

	int a = 0;
	while (a< 5) {
		a++;
		printf("%d\t", a);
	}
	printf("\n");

	int b = 0;
	while (b< 5) {
		b++;
		printf("%d\t", b);
	}
	printf("\n");

	int j = 0;
	while (j++< 5) {
		printf("%d\t", j);
	}
	printf("\n");

	int k = 0;
	while (++k< 5) {
		printf("%d\t", k);
	}
}

7.宏、常量

#include#define PI 3.14
const float e = 2.71;
int main() {
	printf("%f\n", PI * 3);
	printf("%f", e);

}

8.转义字符

#includeint main() {
	printf("'");
	printf("\n");
	printf("\'");
	printf("\n");
	printf("I say 'hi!'");
	printf("\n");
	printf("I say \'hi!\'");
}

9.ASCII码

#includeint main() {
	char c = 'a';
	printf("%d\n", (int)c);
	char e = 'A';
	printf("%d\n", (int)e);
	char x = '0';
	printf("%d\n", (int)x);
	printf("%d\n", 'a' - NULL);
}

10.输入输出

float a = 3.1;
printf("%7.2f", a);

11.条件、条件表达式

int a = 5;
int b = 3;
int x = ( a >b ) ? a : b;

12.switch

#includeint main() {
	int a;
	scanf("%d", &a);
	switch (a) {
	case 1:
		printf("Mon");
		break;
	case 2:
		printf("Tue");
		break;
	default:
		break;
	}

#includeint main()
{
    int a = 3;
    int b = 5;
    char op;
    scanf("%c", &op);
    switch (op) {
    case '*':
    case 'x':
    case 'X':
        printf("%d", a * b);
        break;
    default:
        break;
    }
}

13.continue、break

最小公倍数

#includeint main() {
	int a = 1;
	while (a % 5 != 0 || a % 3 != 0) {
		a++;
	}
	printf("%d\n", a);

	

int a=1;
while (a) {
		if (a % 5 != 0 || a % 3 != 0) {
			a++;
			continue;
		}
		else break;
		printf("hw");
	}
	printf("%d", a);

14.函数

【1】阶乘

#includeint main() {
	int a;
	int re = 1;
	scanf("%d", &a);
	while (a) {
		re *= a;
		a--;
	}
	printf("%d", re);
}

【2】斐波那契数列

#include#include//0 1 2 3 4 5 6 
//0 1 1 2 3 5 8 
int fib(int x);
int fib2(int x);
int main() {
	int begintime, endtime;
	int a;
	scanf("%d", &a);
	begintime = clock();
	printf("%d\n", fib2(a));

	endtime = clock();
	printf("Time:%dms\n", endtime - begintime);
}
int fib(int x) {
	if (x == 0)return 0;
	else if (x == 1) return 1;
	else if (x >1) return fib(x - 1) + fib(x - 2);
	else return -1;
}
int fib2(int x) {
	if (x< 0) return -1;
	if (x == 0)return 0;
	if (x == 1)return 1;

	int i = 0;
	int j = 1;
	for (int k = 2; k<= x; k++) {
		j = i + j;
		i = j - i;
	}
	return j;
}

【3】swap

#includeint swap1(int x, int y);
int swap2(int& x, int& y);
int swap3(int* x, int* y);
int main() {
	int a = 3, b = 5;
	printf("%d %d\n", a, b);
	swap1(a, b);
	printf("%d %d\n", a, b);
	swap2(a, b);
	printf("%d %d\n", a, b);
	swap3(&a, &b);
	printf("%d %d\n", a, b);
}
int swap1(int x, int y) {
	int tmp;
	tmp = x;
	x = y;
	y = tmp;
}
int swap2(int& x, int& y) {
	int tmp;
	tmp = x;
	x = y;
	y = tmp;
}
int swap3(int* x, int* y) {
	int tmp;
	tmp = *x;
	*x = *y;
	*y = tmp;
}

15.数组

【1】一维数组

#includeint main() {
	int a[] = { 1,2,3,4,5,6 };

	int arr[10] = { 0 };
	int sz = sizeof(arr) / sizeof(arr[0]);
	for (int i = 0; i< sz; i++) {
		printf("%d\t", arr[i]);
	}
}

【2】二维数组

#includeint main()
{
	int arr[3][4] = { 0 };
	int i = 0;
	for (i = 0; i< 3; i++)
	{
		int j = 0;
		for (j = 0; j< 4; j++)
		{
			arr[i][j] = i * 4 + j;
		}
	}

	for (i = 0; i< 3; i++)
	{
		int j = 0;
		for (j = 0; j< 4; j++)
		{
			printf("%d\t", arr[i][j]);
		}
		printf("\n");
	}
	return 0;
}

。。。

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