【计算机二级C语言】卷003

#include <stdio.h>
void main() 
{
    int a = 1, b = 1, c = 1; 
    if (a-- || b-- && --c) 
        printf("%d,%d,%d\n", a, b, c);
    else
        printf("%d,%d,%d\n", a, c, b);
}

程序执行后的输出结果是() 。

#include <stdio.h>
void main() 
{
    int a = 123456, b; 
    while (a) 
    {
        b = a % 10; 
        a /= 10; 
        switch (b) 
        {
            default: printf("%d", b++);
            case 1: break; 
            case 2: printf("%d", b++); break; 
            case 3: printf("%d", b++);
            case 4: printf("%d", b++);
            case 5: printf("%d", b++);
        }
    }
}

程序执行后的输出结果是() 。

#include <stdio.h>
void main() 
{
    int a = 1, b = -2; 
    for (; a-- && b++;) 
        printf("%d,%d,", a, b);
    printf("%d,%d", a, b);
}

程序执行后的输出结果是() 。

#include <stdio.h>
void main() 
{
    int a = 7, i; 
    for (i = 1; i <= 3; i++) 
    {
        if (a > 14) break; 
        if (a % 2) { a += 3; continue; }
        a = a + 4; 
        printf("%d,%d,", i, a);
    }
    printf("%d,%d", i, a);
}

程序执行后的输出结果是() 。

#include <stdio.h>
void main() 
{
    char b[] = "happychristmas", k; 
    for (k = 0; b[k]; k++) 
    {
        if (b[k] < 'm') 
            b[k] = b[k] - 'a' + 'A'; 
        printf("%c", b[k]);
    }
}

程序执行后的输出结果是() 。

#include <stdio.h>
int *f(int *s) 
{
    s += 1; 
    s[1] += 6; 
    *s-- += 7; 
    return s; 
}
void main() 
{
    int a[5] = { 1, 2, 3, 4, 5 }, *p; 
    p = f(a);
    printf("%d,%d,%d,%d", a[1], a[2], *p, p[1]);
}

程序执行后的输出结果是() 。

#include <stdio.h>
void swap(int *a, int *b) 
{
    int *tp, t; 
    t = *a; *a = *b; *b = t; 
    tp = a; a = b; b = tp; 
    printf("%d,%d,", *a, *b);
}
void main() 
{
    int i = 3, j = 7, *p = &i, *q = &j; 
    swap(&i, &j);
    printf("%d,%d", *p, *q);
}

程序执行后的输出结果是() 。

#include <stdio.h>
#define N 4
int fun(int a[][N]) 
{
    int i, y = 0; 
    for (i = 0; i < N; i++) 
    y += a[i][0] + a[i][N - 1]; 
    for (i = 1; i < N - 1; i++) 
    y += a[0][i] + a[N - 1][i]; 
    return y; 
}
void main() 
{
    int y, x[N][N] = {
        {1, 2, 3, 4 }, 
        {2, 1, 4, 3 }, 
        {3, 4, 1, 2 }, 
        {4, 3, 2, 1 }}; 
        y = fun(x);
        printf("%d", y);
    }

程序执行后的输出结果是() 。

#include <stdio.h>
void fun(int a[ ], int n, int flag) 
{
    int i = 0, j, t; 
    for (i = 0; i < n - 1; i++) 
    for (j = i + 1; j < n; j++) 
    if (flag ? (a[i] < a[j]) :(a[i] > a[j]))
    { t = a[i]; a[i] = a[j]; a[j] = t; }
}
void main() 
{
    int c[10] = { 7, 9, 10, 8, 3, 5, 1, 6, 2, 4 }, i; 
    fun(c, 5, 1);
    fun(c + 5, 5, 0);
    for (i = 0; i < 10; i++) 
    printf("%d,", c[i]);
}

程序执行后的输出结果是() 。

#include <stdio.h>
void main() 
{
    int i, j = 0; 
    char a[] = "ab1b23c4d56ef7gh89i9j64k", b[100]; 
    for (i = 0; a[i]; i++) 
    if (a[i] < 'a' || a[i] > 'z') 
    b[j++] = a[i]; 
    for (i = 0; a[i]; i++) 
    if (a[i] < '0' || a[i] > '9') 
    b[j++] = a[i]; 
    b[j] = '\0'; 
    printf("%s", b);
}

程序执行后的输出结果是() 。

#include <stdio.h>
void main() 
{
    char v[4][10] = { "efg","abcd","mnopq","hijkl" }, *p[4], t; 
    int i, j; 
    for (i = 0; i < 4; i++) 
    p[i] = v[i]; 
    for (i = 0; i < 3; i++) 
    for (j = i + 1; j < 4; j++) 
    if (*p[i] > *p[j]) 
    { t = *p[i]; *p[i] = *p[j]; *p[j] = t; }
    for (i = 0; i < 4; i++) 
    printf("%s " , v[i]);
}

程序执行后的输出结果是() 。

#include <stdio.h>
void main() 
{
    char v[5][10] = { "efg","abcd","snopq","hijkl","xyz" }; 
    printf("%s,%c,%s,%c,%s" , *v, **(v + 3), v[4] + 2, *(v[2] + 4),v[1] + 1);
}

程序执行后的输出结果是() 。

#include <stdio.h>
#include <string.h>
void main() 
{
    char a[5][10] = { "efg","abcd","mnopq","hijkl","rstuvwxyz" }; 
    char *p[5]; 
    int i, len; 
    for (i = 0; i < 5; i++) 
    {
        p[i] = a[i]; 
        len = strlen(p[i]);
        printf("%c", p[i][0]);
        printf("%s", p[i] + len / 2);
    }
}

程序执行后的输出结果是() 。

#include <stdio.h>
int f(int x) 
{
    if (x < 2) 
    return 1; 
    return x*f(x - 1) + (x - 1) *f(x - 2);
}
void main() 
{
    int y; 
    y = f(4);
    printf("%d\n", y);
}

程序执行后的输出结果是() 。

#include <stdio.h>
int a = 5; 
int func(int d) 
{
    int b = 5; 
    static int c = 5; 
    a--; b--; --c; --d; 
    return a + b + c + d; 
}
void main() 
{
    int k, a = 4; 
    for (k = 0; k < 3; k++) 
    printf("%d,", func(a--)); 
}

程序执行后的输出结果是() 。

#include <stdio.h>
#define S1(x, y) x*y
#define S2(x, y) (x) *(y) 
void main() 
{
    int a = 2, b = 5; 
    printf("%d,%d,%d,%d", S1(a + b, a + b), S1(a + b, b + a), S2(a + b, a + b), S2(a + b, b + a)); 
}

程序执行后的输出结果是() 。

#include <stdio.h>
#include <string.h>
typedef struct stu {
    char name[9]; 
    char gender; 
    int score; 
} STU; 
STU a = { "Zhao", 'm', 85 }; 
STU f() 
{
    STU c = { "Sun", 'f', 90 }; 
    strcpy(a.name, c.name);
    a.gender = c.gender; 
    a.score = c.score; 
    return a; 
}
void main() 
{
    STU b = { "Qian", 'f', 95 }; 
    b = f();
    printf("%s,%c,%d,%s,%c,%d", a.name, a.gender, a.score, b.name, b.gender, b.score);
}

程序执行后的输出结果是() 。

#include <stdio.h>
typedef struct stu {
    char name[9]; 
    char gender; 
    int score; 
} STU; 
void f(STU *a) 
{
    STU c = { "Sun", 'f', 90 }, *d = &c; 
    *a = *d; 
    printf("%s,%c,%d,", a->name, a->gender, a->score);
}
void main() 
{
    STU b = { "Zhao", 'm', 85 }, *a = &b; 
    f(a);
    printf("%s,%c,%d", a->name, a->gender, a->score);
}

程序执行后的输出结果是() 。

#include <stdio.h>
void main() 
{
    int x = 4, y = 2, z1, z2; 
    z1 = x && y; z2 = x&y; 
    printf("%d,%d\n", z1, z2);
}

程序执行后的输出结果是() 。

#include <stdio.h>
void main() 
{
    FILE *fp; 
    int i, a[6] = { 1, 2, 3, 4, 5, 6 }; 
    fp = fopen("d.dat", "w+b");
    for (i = 5; i >= 0; i--) 
    fwrite(&a[i], sizeof(int), 1, fp);
    rewind(fp);
    fread(&a[3], sizeof(int), 3, fp);
    fclose(fp);
    for (i = 0; i < 6; i++) 
    printf("%d,", a[i]);
}

程序执行后的输出结果是() 。

首先需要理解，题意中二维数组的主对角线元素是指行下标和列下标相等的元素，次对角线元素是指行下标和列下标之和为N - 1的元素。接下来编写fun函数，程序定义两个变量i和k，k初值为0，通过两个for循环完成题意要求，第一个for循环遍历二维数组的主对角线元素a[i][i]，乘2后赋值给p[k]，再
对k自增1；第二个for循环遍历二维数组的次对角线元素a[i][N - i - 1]，乘3后赋值给p[k]，再对k自增1。

原文：https://www.cnblogs.com/mjios/p/12405599.html