Daily C language small exercises-1.0

1. Given the values ​​of two integer variables, swap the contents of the two values.

int i = 1,
    j = 2,
    temp = 0;
temp = i;
i = j;
j = temp;
printf("i:%d j:%d", i, j);

2. It is not allowed to create temporary variables and exchange the contents of two numbers

int i = 1,
    j = 2;
i = i + j;
j = i - j;
i = i - j;
printf("i:%d j:%d", i, j);

3. Print the maximum value of 10 integers

int num[10] = {6,10,2,4,6,1,8,9,3,5};
	int j,
		max = num[0],
		len = sizeof(num) / sizeof(num[0]);
	for (j = 1; j < len; j++) {
		if (num[j] > max)
			max = num[j];
	}
	printf("The maximum number of these ten integers is: %d\n", max);

4. Output the three numbers in descending order.

int a, b, c, temp;
	printf("Enter three numbers:\n");
	scanf_s("%d %d %d", &a, &b, &c);
	if (a < b) {
		temp = a; a = b; b = temp;
	}
	if (b < c) {
		temp = b; b = c; c = temp;
	}
	if (a < b) {
		temp = a; a = b, b = temp;
	}
	printf("From big to small: %d %d %d\n", a, b, c);

5. Find the greatest common divisor of two numbers

int x, y, temp;
	printf("Please enter two numbers\n");
	scanf_s("%d,%d", &x, &y);

	if (x < y) {
		temp = x;
		x = y;
		y = temp;
	}
	for (temp = y; x % temp || y % temp; temp --);

	printf("The greatest common divisor is: %d\n", temp);