C_TA_Website/source/_posts/homework1.md

title	date	tags
第一次作业（题目）	2020-10-30 09:47:21

第一题

写出下列程序运行的结果：

#include <stdio.h>

int main()
{
    int a, b;
    char c1, c2;
    float d, e;
    double f, g;
    long m, n;
    unsigned int p, q;
    a = 61; b = 62;
    c1 = 'a'; c2 = 'b';
    d = 3.56; e = -6.78;
    f = 3157.890121; g = 0.123456789;
    m = 50000; n = -60000;
    p = 32768; q = 4000;
    printf("sizeof: %d, a = %d, b = %d\n", sizeof(int), a, b);
    printf("sizeof: %d, c1 = %c, c2 = %c\n", sizeof(char), c1, c2);
    printf("sizeof: %d, d = %-6.2f, e = %-6.2f\n", sizeof(float), d, e);
    printf("sizeof: %d, f = %-15.6f, g = %-15.12f\n", sizeof(double), f, g);
    printf("sizeof: %d, m = %ld, n = %ld\n", sizeof(long), m, n);
    printf("sizeof: %d, p = %u, q = %u\n", sizeof(unsigned), p, q);
    return 0;
}

第二题

写出下列程序的运行结果：

#include <stdio.h>

int main()
{
    int i, j, m, n;
    i = 8; j = 10;
    m = ++i; n = j++;
    printf("%d, %d, %d, %d\n", i, j, m, n);
    return 0;
}

第三题

求下面算术表达式的值：

#	表达式	变量的值
1	3.5 + 1 / 2 + 56 % 10
2	(a++ * 1 / 3)	设a = 2
3	x + a % 3 * (int)(x + y) % 2 / 4	设x = 2.5, a = 7, y = 4.7
4	(float)(a + b) / 2 + (int)x % (int)y	设a = 2, b = 3, x = 3.5, y = 2.5
5	x = (x = ++y, x + 5, x / 5)	设x = 3, y = 4

第五题

写出下面表达式运算后a的值，设原来a = 12。

1. a += a
2. a *= 2 + 3
3. a /= a + a
4. a += a -= a *= a