[推荐] 筒子们来测试下C语言的基础水平

大灰狼

1，The output for this program is： (a) 3 (b) 5 (c) 0
C/C++ code

1. #include<setjmp.h>
   
2. 
   
3. static jmp_buf buf;
   
4. 
   
5. int main() {
   
6.     volatile int b;
   
7.     b =3;
   
8. 
   
9.     if(setjmp(buf)!=0) {
   
10.         printf("%d ", b);
    
11.         exit(0);
    
12.     }
    
13.     b=5;
    
14. 
    
15.     longjmp(buf , 1);
    
16. 
    
17.     return 0;
    
18. }
    
19. 2，The output for this program is： (a) 3 (b) 5 (c) 6 (d) 7
    
20. C/C++ code
    
21. struct node { int a; int b; int c; };
    
22. int main() {
    
23.     struct node s= { 3, 5,6 };
    
24.     struct node *pt = &s;
    
25.     printf("%d" , *(int*)pt);
    
26. 
    
27.     return 0;
    
28. }
    
29. 3，What function of x and n is compute by this code segment?
    
30. (a) x^n (b) x*n (c) n^x (d) None of the above
    
31. int foo ( int x , int n) {
    
32.     int val;
    
33.     val =1;
    
34.     if (n>0) {
    
35.         if (n%2 == 1) val = val *x;
    
36.         val = val * foo(x*x , n/2);
    
37.     }
    
38.     return val;
    
39. }
    
40. 
    
41. 4，The output for this program is： (a) 2 2 (b) 2 1 (c) 2 5 (d) None of the above
    
42. C/C++ code
    
43. 
    
44. int main() {
    
45.     int a[5] = {1,2,3,4,5};
    
46.     int *ptr = (int*)(&a+1);
    
47.     printf("%d %d" , *(a+1), *(ptr-1) );
    
48.     return 0;
    
49. }
    
50. 
    
51. 5，The output for this program is： (a) 8 (b) 9 (c) 7 (d) None of the above
    
52. C/C++ codevoid foo(int [][3] );
    
53. int main(){
    
54.     int a [3][3]= { { 1,2,3} , { 4,5,6},{7,8,9}};
    
55.     foo(a);
    
56.     printf("%d" , a[2][1]);
    
57.     return 0;
    
58. }
    
59. 
    
60. void foo( int b[][3]) {
    
61.     ++ b;
    
62.     b[1][1] =9;
    
63. }
    
64. 
    
65. 6，The output for this program is： (a) c=3 d=3 (b) c=5 d=3 (c) c=3 d=5 (d) c=5 d=5
    
66. C/C++ codeint main() {
    
67.     int a, b,c, d;
    
68.     a=3;
    
69.     b=5;
    
70.     c=a,b;
    
71.     d=(a,b);
    
72.     printf("c=%d" ,c);
    
73.     printf("d=%d" ,d);
    
74.     return 0;
    
75. }
    
76. 
    
77. 7，The output for this program is：(a) 2 3 5 6 (b) 2 3 4 5 (c) 4 5 0 0 (d) None of the above
    
78. C/C++ codeint main() {
    
79.     int a[][3] = { 1,2,3 ,4,5,6};
    
80.     int (*ptr)[3] =a;
    
81.     printf("%d %d " ,(*ptr)[1], (*ptr)[2] );
    
82.     ++ptr;
    
83.     printf("%d %d" ,(*ptr)[1], (*ptr)[2] );
    
84.     return 0;
    
85. }
    
86. 
    
87. 8，Which of the above three functions are likely to cause problem with pointers
    
88. (a) Only f3 (b) Only f1 and f3 (c) Only f1 and f2 (d) f1 , f2 ,f3
    
89. C/C++ codeint *f1(void) {
    
90.     int x =10;
    
91.     return(&x);
    
92. }
    
93. int *f2(void) {
    
94.     int*ptr;
    
95.     *ptr =10;
    
96.     return ptr;
    
97. }
    
98. int *f3(void) {
    
99.     int *ptr;
    
100.     ptr=(int*) malloc(sizeof(int));
     
101.     return ptr;
     
102. }
     
103. 
     
104. 9，The output for this program is： (a) i=4 j=2 (b) i=3 j=2 (c) i=3 j=4 (d) i=3 j=6
     
105. C/C++ code
     
106. int main() {     int i=3;     int j;     j = sizeof(++i+ ++i);     printf("i=%d j=%d", i ,j);     return 0;}
     
107. 10，The output for this program is： (a) 5 5 5 5 (b) 3 5 3 5 (c) 5 3 5 3 (d) 3 3 3 3
     
108. C/C++ code
     
109. void f1(int *, int);
     
110. void f2(int *, int);
     
111. void(*p[2]) ( int *, int);
     
112. 
     
113. int main() {
     
114.     int a;
     
115.     int b;
     
116.     p[0] = f1;
     
117.     p[1] = f2;
     
118.     a=3;
     
119.     b=5;
     
120.     p[0](&a , b);
     
121.     printf("%d\t %d\t" , a ,b);
     
122.     p[1](&a , b);
     
123.     printf("%d\t %d\t" , a ,b);
     
124.     return 0;
     
125. }
     
126. 
     
127. void f1( int* p , int q) {
     
128.     int tmp;
     
129.     tmp =*p;
     
130.     *p = q;
     
131.     q= tmp;
     
132. }
     
133. void f2( int* p , int q) {
     
134.     int tmp;
     
135.     tmp =*p;
     
136.     *p = q;
     
137.     q= tmp;
     
138. }
     
139. 
     
140. 11，The output for this program is： (a) 0 1 2 0 (b) 0 1 2 1 (c) 1 2 0 1 (d) 0 2 1 1
     
141. C/C++ codevoid e(int );
     
142. int main() {
     
143.     int a;
     
144.     a=3;
     
145.     e(a);
     
146.     return 0;
     
147. }
     
148. 
     
149. void e(int n) {
     
150.     if(n>0) {
     
151.         e(--n);
     
152.         printf("%d" , n);
     
153.         e(--n);
     
154.     }
     
155. }
     
156. 
     
157. 12，type of tmp is (a) Pointer to function of having two arguments that is pointer to float
     
158. (b) int
     
159. (c) Pointer to function having two argument that is pointer to float and return int
     
160. (d) None of the above
     
161. C/C++ code
     
162. typedef int (*test) ( float * , float*)
     
163. test tmp;
     
164. 
     
165. 
     
166. 13，The output for this program is： (a) 5 (b) 6 (c) 9 (d) None of the above
     
167. C/C++ code
     
168. int main() {
     
169.     char *p;
     
170.     char buf[10] ={ 1,2,3,4,5,6,9,8};
     
171.     p = &((buf+1)[5]);
     
172.     printf("%d" , *p);
     
173.     return 0;
     
174. }
     
175. 
     
176. 
     
177. 14，The output for this program is： (a) ab (b) cd (c) ef (d) gh
     
178. C/C++ code
     
179. Void f(char**);
     
180. int main() {
     
181.     char * argv[] = { "ab" ,"cd" , "ef" ,"gh", "ij" ,"kl" };
     
182.     f( argv );
     
183. 
     
184.     return 0;
     
185. }
     
186. void f( char **p ) {
     
187.     char* t;
     
188.     t= (p+= sizeof(int))[-1];
     
189.     printf( "%s" , t);     
     
190. }
     
191. 
     
192. 
     
193. 15，The output for this program is： (a) 7 (b) 6 (c) 5 (d) 3
     
194. C/C++ code
     
195. #include<stdarg.h>
     
196. int ripple ( int , ...);
     
197. int main(){
     
198.     int num;
     
199.     num = ripple ( 3, 5,7);
     
200.     printf( " %d" , num);
     
201.     return 0;
     
202. }
     
203. 
     
204. int ripple (int n, ...) {
     
205.     int i , j;
     
206.     int k;
     
207.     va_list p;
     
208.     k= 0;
     
209.     j = 1;
     
210.     va_start( p , n);
     
211.     for (; j<n; ++j) {
     
212.         i = va_arg( p , int);
     
213.         for (; i; i &=i-1 )
     
214.             ++k;
     
215.     }
     
216.     return k;
     
217. }
     
218. 
     
219. 
     
220. 16， The value of j at the end of the execution of the this program is:
     
221. (a) 10 (b) 15 (c) 6 (d) 7
     
222. C/C++ code
     
223. int counter (int i) {
     
224.     static int count =0;
     
225.     count = count +i;
     
226.     return (count );
     
227. }
     
228. int main() {
     
229.     int i , j;
     
230.     for (i=0; i <=5; i++)
     
231.     j = counter(i);
     
232.     return 0;
     
233. }
     
234. 
     
235. 
     

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