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- Question
If I use the following printf() to print a long int why I am not warned about the type mismatch? printf ("%d",num );
- Correct Answer
- When a function accepts a variable number of arguments , its prototype cannot provide any information about the number of arguments and type of those variable arguments Hence the compiler cannot warn about the mismatches The programmer must make sure that arguments match or must manually insert explicit typecast
- 1. What is the difference between malloc() and calloc() functions? Discuss
- 2. Can I increase the size of a dynamically allocated array? < Yes / No> if yes, how? Discuss
- 3. 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
- 4. How would you dynamically allocate a 2-D array of integers? Discuss
- 5. 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
- 6. How would you use qsort() function to sort an array of structures? Discuss
- 7. What will be output of following c code? #include
int main() { int i; for(i=10;i<=15;i++){ while(i){ do{ printf("%d ",1); if(i>1) continue; }while(0); break; } } return 0; }
Discuss
- 8. What will be output of following c code? void main() { struct bitfield { unsigned a:5; unsigned c:5; unsigned b:6; }bit; char *p; struct bitfield *ptr,bit1={1,3,3}; p=&bit1; p++; clrscr(); printf("%d",*p); getch(); } Discuss
- 9. What will be output when you will execute following c code? #include
enum actor { SeanPenn=5, AlPacino=-2, GaryOldman, EdNorton }; void main() { enum actor a=0; switch(a) { case SeanPenn: printf("Kevin Spacey"); break; case AlPacino: printf("Paul Giamatti"); break; case GaryOldman:printf("Donald Shuterland"); break; case EdNorton: printf("Johnny Depp"); } }
Options- A. Kevin Spacey
- B. Paul Giamatti
- C. Donald Shuterland
- D. Johnny Depp Discuss
- 10. Write a c program to create dos command type. Discuss
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Correct Answer: As against malloc(), calloc() needs two arguments, the number of elements to be allocated and the size of each element For example, p = (int *) calloc (10, sizeof (int)); would allocate space for a 10- integer array Additionally, calloc() would also set each of this element with a value 0 Thus the above call to calloc() is equivalent to: p = (int *) malloc (10 * sizeof (int)); memset (p, 0, 10 * sizeof( int ));
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 */ } } }
Correct Answer: for ( i=0; i < MAXROW ; i++) free (p[i]); free (p);
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: 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 "stringh" #include "stdlibh" struct stud { int rollno; int marks; char name[30]; }; int sort_m (struct stud *, struct stud *); int sort_name (struct stud *, struct stud *); int sort_marks (struct stud *, struct stud *); main() { static struct stud ss[] = { { 15, 96, "Akshay" }, { 2, 97, "Madhuri" }, { 8, 85, "Aishvarya" }, { 10, 80, "Sushmita" } }; int x,w; clrscr(); w = sizeof (struct stud); printf ('\nIn order of roll numbers:"); qsort (ss, 4, w, sort_rn); for(x=0; x<4;x++) printf ("\n%d%s%d", ss[x]rollno, ss[x]name,ss[x]marks); printf("\n\nIn order of names:"); qsort(ss, 4, sort_name); for (x=0; x<4;x++) printf("\n%d%s%d",ss[x]rollno, ss[x]name,ss[x]marks); printf("\n\nIn order of marks:"); qsort(ss,4,w,sort_marks); for (x=0;x<4;x++) printf ("\n%d%s%d",ss[x]rollno,ss[x]name,ss[x]marks); } int sort_rn (struct stud *t1, struct stud *t2) { return (t1->rollno-t2->rollno); } int sort_name (struct stud *t1, struct stud *t2) { return (strcmp(t1->name,t2->name)); } int sort_marks (struct stud *t1, struct stud *t2) { return (t2->marks-t1->marks); }
Correct Answer: Output: 1 1 1 1 1 1 For loop will execute six times Note: continue keyword in do-while loop bring the program its while condition (while(0)) which is always false
Correct Answer: Output: 12 Explanation: Binary value of a=1 is 00001 (in 5 bit) Binary value of b=3 is 00011 (in 5 bit) Binary value of c=3 is 000011 (in 6 bit) In memory it is represented as: Let address of bit1 is 500 which initialize to char pointer p Since can is one byte data type so p++ will be 501 *p means content of memory location 501 which is (00001100) and its binary equivalent is 12 Hence output is 12
Correct Answer: Johnny Depp
Explanation:
Default value of enum constant
GaryOldman = -2 +1 = -1
And default value of enum constant
EdNorton = -1 + 1 = 0
Note: Case expression can be enum constant.
Correct Answer: #include int main( int count,char * argv[] ) { int i; FILE *ptr; char *str; char ch; if( count == 1) { printf( "The syntax of the command is incorrect\n" ); } for( i=1;i
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