考试题

第一题

include<stdio.h>

int main() {
int sum1 = 0, sum2 = 0;
for (int i = 1; i <= 50; i++) {
for (int j = 1; j <= i; j++) {
sum1 += j;
}
sum2 += sum1;
}
printf("%d", sum2);
return 0;
}

第二题

include<stdio.h>

int main() {
int i, j, k;
char ch;
ch = 'A';
for (j = 1; j <= 4; j++) {

	for (k = 1; k <= 4 - j; k++)
	{
		printf(" ");
	}

	printf("%c", ch + j - 1);
	if (j != 1)
	{
		for (i = 1; i <= 2 * (j - 1)-1; i++)
			printf(" ");
		printf("%c", ch + j - 1);

	}
	printf("\n");

}
ch = 'D';
for (j=1; j <4; j++) {

	for (k = 3; k >= 4 - j; k--)
	{
		printf(" ");
	}

	printf("%c", ch -j);
	if (j != 3)
	{
		for (i = 1; i <= (-2)*j+5; i++)
			printf(" ");
		printf("%c", ch -j);

	}
	printf("\n");

}

}

第三题

include<stdio.h>

int main()
{
int a, b, c, d, i = 0;
for (a = 0; a <= 9; a++)
for (b = 0; b <= 9; b++)
for (c = 0; c <= 9; c++)
for (d = 0; d <= 9; d++)
if ((a10 + b)(c10 + d)) == ((b10 + a)(d10 + c))
{
printf("%d%d%d%d=%d%d%d%d ", a, b, c, d, b, a, d, c);
i++;
if (i % 5 == 0)
printf("\n");
}
return 0;
}

第四题

include<stdio.h>

include<stdlib.h>

include<time.h>

int main()
{
int a, i, b;
srand(time(0));
a = rand();
for (i = 1; i <= 99; i++) {
b = rand();
if (a > b)
a = b;
}
printf("%d", a);
return 0;
}