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- Question
Answer the following Program #define CHARSIZE 8 #define MASK(y) (1 << y % CHARSIZE) #define BITSLOT (y) (y / CHARSIZE) #define SET(x,y) ( x[BITSLOT(y)] = MASK(y) ) #define TEST(x,y) ( x[BITSLOT(y)] & MASK(y) ) #define NUMSLOTS(n) ((n + CHARSIZE - 1) / CHARSIZE) Give the above macros how would you 1. declare an array arr of 50 bits 2. put the 20th bit on 3. test whether the 40th bit is on or off
- Correct Answer
- 1 char arr[NUMSLOTS(50)]; 2 SET (arr, 20); 3 if (TEST (arr, 40))
- 1. What would be the output of the following program ? main() { unsigned int a = oxffff; ~a; printf ("%x", a); }
Options- A. ffff
- B. 0000
- C. 00ff
- D. None of the above Discuss
- 2. If the following program (myprog) is run from the command line as myprog 1 2 3 what would be the output? main(int argc, char *argv[]) { int i, j = 0; for (i = 0; i < argc ; i++) j = j + atoi ( argv[i]); printf ("%d", j); }
Options- A. 123
- B. 6
- C. Error
- D. "123" Discuss
- 3. What would be the output of the following program? /* sample.c */ main ( int argc, char **argv ) { argc = argc - (argc -1); printf ("%s", argv[argc - 1]); } Discuss
- 4. Point out the error, if any, in the following program. # include "stdio.h" main() { FILE *fp; char str[80]; fp = fopen ("trail", "r"); while (!feof (fp)) { fgets (str, 80, fp); puts (str); } fclose (fp); } Discuss
- 5. How would you check whether the contents of two structure variables are same or not? Discuss
- 6. In the following code can we declare a new typedef name emp even though struct employee has not been completely defined while using typedef? < Yes / No> typedef struct employee *ptr; struct employee { char name[20]; int age; ptr next; }; Discuss
- 7. Improve the following code using typedef. struct node { int data1; float data2; struct node *left; struct node *right; }; struct node *ptr; ptr = (struct node *) malloc (sizeof (struct node) ); Discuss
- 8. How would you dynamically allocate a 2-D array of integers? Discuss
- 9. How would you free the memory allocated by the following program? #include "alloc.h" #define MAXROW 3 #define MAXCOL 4 main() { int **p, i; p = (int **) malloc (MAXROW * sizeof (int *)); for ( i = 0; i < MAXROW ; i++) p[i] = (int *) malloc (MAXCOL * sizeof (int )); } Discuss
- 10. Can I increase the size of a dynamically allocated array? < Yes / No> if yes, how? Discuss
Programming problems
Search Results
Correct Answer: ffff
Correct Answer: 6
Explanation:
When atoi() tries to convert argv[0] to a number it cannot do so (argv[0] being a file name) and hence returns a zero.
Correct Answer: C: \SAMPLEEXE
Correct Answer: The last line from the file "trial" would be read twice To avoid this, ues: While ( fgets (str, 80, fp) ! = NULL) puts (str);
Correct Answer: struct emp { char n[20]; int age; }; main() { struct emp e1 = {"Dravid", 23}; struct emp e2; scanf ("%s %d",e2n, & e2age); if( structcmp (e1,e2) ==0) printf ("The structures are equal"); else printf ("The structures are unequal"); } structcmp ( struct emp x, struct emp y) { if (strcmp (xn,yn) ==0) if (xage == yage) return (0); return (1); } In short, if you nee to compare two structures, you'll have to write your own function to do so which carries out the comparison field by field
Correct Answer: Yes
Correct Answer: typedef struct node * treeptr typedef struct node { int data1; float data2; treeptr *left; treeptr *right; }treenode; treeptr ptr; ptr = ( treeptr ) malloc ( sizeof ( treenode ) );
Correct Answer: #include "alloch" #define MAXROW 3 #define MAXcol 4 main() { int *p, i, J; p = (int *) malloc (MAXROW * MAXCOL * sizeof (int)); for ( i=0; i < MaxROW ; i++) { for (j=0; j < MAXCOL ; j++) { p [ i * MAXCOL + j] = i; printf ( "%d", p [i * MAXCOL + j] ); } printf ("\n"); } }
Correct Answer: for ( i=0; i < MAXROW ; i++) free (p[i]); free (p);
Correct Answer: Yes, using the realloc() function as shown below: main() { int *p; p = ( int *) malloc (20) ; t = p; t = (int *) realloc ( p, 40); if ( t == NULL ) Printf (" Cannot reallocate, leaves previous allocated region unchanged "); else { if ( p ==t ) ; / * the array expanded at the same region */ else { free ( p ); / * deallocate the original array */ p = t; /* set p to newly allocated region */ } } }
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