C language programs

1. main()
{
int i=-1,j=-1,k=0,l=2,m;
m=i++&&j++&&k++||l++;
printf("%d %d %d %d %d",i,j,k,l,m);
}
Answer:
0 0 1 3 1
2. main()
{
int i=3;
switch(i)
{
default:printf("zero");
case 1: printf("one");
break;
case 2:printf("two");
break;
case 3: printf("three");
break;
}
}
Answer :
three
3. main()
{
printf("%x",-1<<4 br="">}
Answer:
fff0
4. main()
{
int c=- -2;
printf("c=%d",c);
}
Answer:
c=2;
5. main()
{
int i=10;
i=!i>14;
Printf ("i=%d",i);
}
Answer: i=0
1
6. main()
{
printf("\nab");
printf("\bsi");
printf("\rha");
}
Answer:
hai
7. main()
{
int i=5;
printf("%d%d%d%d%d%d",i++,i--,++i,--i,i);
}
Answer:
45545
8. main()
{
printf("%p",main);
}
Answer:
Some address will be printed
9. main()
{
int i=400,j=300;
printf("%d..%d");
}
Answer:
400..300
10. void main()
{
int i=5;
printf("%d",i++ + ++i);
}
Answer:
Output Cannot be predicted exactly.
11. void main()
{
int i=5;
printf("%d",i+++++i);
}
Answer:
Compiler Error
2
12. #include
main()
{
int i=1,j=2;
switch(i)
{
case 1: printf("GOOD");
break;
case j: printf("BAD");
break;
}
}
Answer:
Compiler Error: Constant expression required in function main.
13. main()
{
int i;
printf("%d",scanf("%d",&i)); // value 10 is given as input here
}
Answer:
1
14. main()
{
int i=0;
for(;i++;printf("%d",i)) ;
printf("%d",i);
}
Answer:
1
15. main()
{
printf("%d", out);
}
int out=100;
Answer:
Compiler error: undefined symbol out in function main.
16. main()
{
int i=-1;
+i;
printf("i = %d, +i = %d \n",i,+i);
}
Answer:
i = -1, +i = -1
3
17. main()
{
char not;
not=!2;
printf("%d",not);
}
Answer:
0
18. main()
{
int k=1;
printf("%d==1 is ""%s",k,k==1?"TRUE":"FALSE");
}
Answer:
1==1 is TRUE
19. main()
{
int y;
scanf("%d",&y); // input given is 2000
if( (y%4==0 && y%100 != 0) || y%100 == 0 )
printf("%d is a leap year");
else
printf("%d is not a leap year");
}
Answer:
2000 is a leap year
20. main()
{
int i=-1;
-i;
printf("i = %d, -i = %d \n",i,-i);
}
Answer:
i = -1, -i = 1
21. #include
main()
{
const int i=4;
float j;
j = ++i;
printf("%d %f", i,++j);
}
Answer:
Compiler error
4
22. main()
{
int i=5,j=6,z;
printf("%d",i+++j);
}
Answer:
11
23. main()
{
int i =0;j=0;
if(i && j++)
printf("%d..%d",i++,j);
printf("%d..%d,i,j);
}
Answer:
0..0
24. int i;
main(){
int t;
for ( t=4;scanf("%d",&i)-t;printf("%d\n",i))
printf("%d--",t--);
}
// If the inputs are 0,1,2,3 find the o/p
Answer:
4--0
3--1
2--2
25. main(){
int a= 0;int b = 20;char x =1;char y =10;
if(a,b,x,y)
printf("hello");
}
Answer:
hello
26. void main()
{
unsigned giveit=-1;
int gotit;
printf("%u ",++giveit);
printf("%u \n",gotit=--giveit);
}
Answer:
0 65535
5
27. main()
{
float me = 1.1;
double you = 1.1;
if(me==you)
printf("I love U");
else
printf("I hate U");
}
Answer:
I hate U
28.a<<1 2="" a="" above="" adding="" b="" br="" by="" c="" d="" dividing="" equivalent="" is="" multiplying="" none="" of="" the="" to="">29. The operation of a stair case switch best explains the a) or operation b) and operation c)exclusive nor operation d)exclusive or operation
30. Which of the following is/are syntactically correct? a) for(); b) for(;); c) for(,); d) for(;;);
31. The expression 4+6/3*2-2+7%3 evaluates to a) 3 b) 4 c) 6 d) 7
32.Any C program a) must contain at least one function b) need not contain ant function c) needs input data d) none of the above
33. Using goto inside for loop is equivalent to using a) continue b) break c) return d)none of the above
34.The program fragment inta=5,b=2; printf(“%d”,a+++++b); a) prints 7 b)prints 8 c) prints 9 d)none of the above
35. printf(“ab” , “cd”,”ef”); prints a) ab abcdef c) abcdef, followed by garbage value d) none of the above
36. Consider the following program segment. i=6720; j=4;
while((i%j)==0)
{
i=i/j;
j=j+1;
}
On termination j will have the value
a) 4 b) 8 c) 9 d) 6720
UNIT-II
Predict the output or error(s) for the following:
6
37. main()
{
char s[ ]="man";
int i;
for(i=0;s[ i ];i++)
printf("\n%c%c%c%c",s[ i ],*(s+i),*(i+s),i[s]);
}
Answer:
mmmm
aaaa
nnnn
38. main()
{
extern int i;
i=20;
printf("%d",i);
}
Answer:
Linker Error : Undefined symbol '_i'
39. #define int char
main()
{
int i=65;
printf("sizeof(i)=%d",sizeof(i));
}
Answer:
sizeof(i)=1
40. #define square(x) x*x
main()
{
int i;
i = 64/square(4);
printf("%d",i);
}
Answer:
64
41. #include
#define a 10
main()
{
#define a 50
printf("%d",a);
7
}
Answer:
50
42. #define clrscr() 100
main()
{
clrscr();
printf("%d\n",clrscr());
}
Answer:
100
43. main()
{
clrscr();
}
clrscr();
Answer:
No output/error
44. main()
{
int i=1;
while (i<=5)
{
printf("%d",i);
if (i>2)
goto here;
i++;
}
}
fun()
{
here:
printf("PP");
}
Answer:
Compiler error: Undefined label 'here' in function main
45. #define f(g,g2) g##g2
main()
{
int var12=100;
printf("%d",f(var,12));
}
Answer:
100
8
46. main()
{
extern out;
printf("%d", out);
}
int out=100;
Answer:
100
47. main()
{
show();
}
void show()
{
printf("I'm the greatest");
}
Answer:
Compier error: Type mismatch in redeclaration of show.
48. int i,j;
for(i=0;i<=10;i++)
{
j+=5;
assert(i<5 br="">}
Answer:
Runtime error: Abnormal program termination.
assert failed (i<5 file="" name="">,
49. #define FALSE -1
#define TRUE 1
#define NULL 0
main() {
if(NULL)
puts("NULL");
else if(FALSE)
puts("TRUE");
else
puts("FALSE");
}
Answer:
TRUE
50. #define max 5
#define int arr1[max]
main()
{
typedef char arr2[max];
arr1 list={0,1,2,3,4};
9
arr2 name="name";
printf("%d %s",list[0],name);
}
Answer:
Compiler error (in the line arr1 list = {0,1,2,3,4})
51. int i=10;
main()
{
extern int i;
{
int i=20;
{
const volatile unsigned i=30;
printf("%d",i);
}
printf("%d",i);
}
printf("%d",i);
}
Answer:
30,20,10
52. #include
main()
{
int a[2][2][2] = { {10,2,3,4}, {5,6,7,8} };
int *p,*q;
p=&a[2][2][2];
*q=***a;
printf("%d..%d",*p,*q);
}
Answer:
garbagevalue..1
53. #include
main()
{
register i=5;
char j[]= "hello";
printf("%s %d",j,i);
}
Answer:
hello 5
54. main()
{
int i=_l_abc(10);
10
printf("%d\n",--i);
}
int _l_abc(int i)
{
return(i++);
}
Answer:
9
55. main()
{
char c=' ',x,convert(z);
getc(c);
if((c>='a') && (c<='z'))
x=convert(c);
printf("%c",x);
}
convert(z)
{
return z-32;
}
Answer:
Compiler error
56. main()
{
int i;
i = abc();
printf("%d",i);
}
abc()
{
_AX = 1000;
}
Answer:
1000
57. What are the following notations of defining functions known as?
i. int abc(int a,float b)
{
/* some code */
}
ii. int abc(a,b)
int a; float b;
{
/* some code*/
}
Answer:
11
i. ANSI C notation
ii. Kernighan & Ritche notation
58. void main()
{
static int i=5;
if(--i){
main();
printf("%d ",i);
}
}
Answer:
0 0 0 0
59. void main()
{
int k=ret(sizeof(float));
printf("\n here value is %d",++k);
}
int ret(int ret)
{
ret += 2.5;
return(ret);
}
Answer:
Here value is 7
60. void main()
{
char a[]="12345\0";
int i=strlen(a);
printf("here in 3 %d\n",++i);
}
Answer:
here in 3 6
61. void main()
{
int i;
char a[]="\0";
if(printf("%s\n",a))
printf("Ok here \n");
else
printf("Forget it\n");
}
Answer:
Ok here
12
62. main()
{
clrscr();
}
clrscr();
Answer:
No output/error
63. main()
{
static int var = 5;
printf("%d ",var--);
if(var)
main();
}
Answer:
5 4 3 2 1
64.Cpreprocessor a) tales care of conditional compilation b) tales care of macros c) tales care of include files d) acts before compilations
65.A preprocessor command a) need not start on a new line b) need not start on the first column c) has # as the first character d) comes before the first executable statement
66. The following program
main()
{
int a=4;
change(a);
printf(“%d”,a);
}
change(int a)
{ printf(“%d”,++a); } outputs a)5 5 b)4 5 c) 5 4 d)4 4
67. The output of the following program is
main()
{
static int x[]={1, 2, 3, 4, 5, 6, 7, 8};
int i;
for(i=2;i<6 br="" i="">x[x[i]]=x[i];
for(i=0; i<8 br="" i="">printf(“%d”,x[i]);
}
a) 1 2 3 3 5 5 7 8 b)1 2 3 4 5 6 7 8 c) 8 7 6 5 4 3 2 1 d)1 2 3 5 4 6 7 8
13
68. The order in which actual parameters are evaluated in a function call a) is from the left b)is from the right c) is compiler dependent d)none of the above
69. The default parameter passing mechanism is a) call by value b) call by reference c) call by value result d) none
70. C does no automatic array bound checking. This is a) true b) false c) C’s asset d) C’s shortcoming
71. If a two dimensional array is used as a formal parameter, then a) both the subscripts may be left empty b) the first( row) subscript may be left empty
c)the first subscript must be left empty d) both the subscripts must be left empty
72. If storage class is missing in the array definition, by default it will be taken to be
a) automatic b) external c) static
d) either automatic or external depending on the place of occurrence
73. Consider the declaration static char hello[]=”hello”; The output of printf(“%s\n”,hello); will be the same as that of a) puts( “hello”); b) puts(hello); c) printf(“%s\n”,”hello”); d) puts(“hello\n”);
74. The array name can be pointer to a) another array b) another variable c) to that array only d) none
75. Array of pointers to table of strings saves a) time b) memory c) CPU utilization d)none of the above
76. The following program
main()
{
inc(); inc(); inc();
}
inc()
{
static int x;
printf(“%d”,++x);
} prints
a)0 1 2 b) 1 2 3 c) 3 consecutive, but unpredictable numbers d) 1 1 1
UNIT-III
Predict the output or error(s) for the following:
77. main()
{
int c[ ]={2.8,3.4,4,6.7,5};
int j,*p=c,*q=c;
for(j=0;j<5 br="" j="">printf(" %d ",*c);
14
++q; }
for(j=0;j<5 br="" j="">printf(" %d ",*p);
++p; }
}
Answer:
2 2 2 2 2 2 3 4 6 5
78. main()
{
char *p="hai friends",*p1;
p1=p;
while(*p!='\0') ++*p++;
printf("%s %s",p,p1);
}
Answer:
ibj!gsjfoet
79. void main()
{
char far *farther,*farthest;
printf("%d..%d",sizeof(farther),sizeof(farthest));
}
Answer:
4..2
80. main()
{
char *p;
p="Hello";
printf("%c\n",*&*p);
}
Answer:
H
81. main()
{
static char names[5][20]={"pascal","ada","cobol","fortran","perl"};
int i;
char *t;
t=names[3];
names[3]=names[4];
names[4]=t;
for (i=0;i<=4;i++)
printf("%s",names[i]);
}
15
Answer:
Compiler error: Lvalue required in function main
82. #include
main()
{
char s[]={'a','b','c','\n','c','\0'};
char *p,*str,*str1;
p=&s[3];
str=p;
str1=s;
printf("%d",++*p + ++*str1-32);
}
Answer:
M
83. main( )
{
int a[2][3][2] = {{{2,4},{7,8},{3,4}},{{2,2},{2,3},{3,4}}};
printf(“%u %u %u %d \n”,a,*a,**a,***a);
printf(“%u %u %u %d \n”,a+1,*a+1,**a+1,***a+1);
}
Answer:
100, 100, 100, 2
114, 104, 102, 3
84. main( )
{
int a[ ] = {10,20,30,40,50},j,*p;
for(j=0; j<5 br="" j="">{
printf(“%d” ,*a);
a++;
}
p = a;
for(j=0; j<5 br="" j="">{
printf(“%d ” ,*p);
p++;
}
}
Answer:
Compiler error: lvalue required.
.
85. main( )
{
16
static int a[ ] = {0,1,2,3,4};
int *p[ ] = {a,a+1,a+2,a+3,a+4};
int **ptr = p;
ptr++;
printf(“\n %d %d %d”, ptr-p, *ptr-a, **ptr);
*ptr++;
printf(“\n %d %d %d”, ptr-p, *ptr-a, **ptr);
*++ptr;
printf(“\n %d %d %d”, ptr-p, *ptr-a, **ptr);
++*ptr;
printf(“\n %d %d %d”, ptr-p, *ptr-a, **ptr);
}
Answer:
111
222
333
344
86. pointers are of a) integer data type b) character data type c) unsigned integer data type d) none of these
87. main( )
{
void *vp;
char ch = ‘g’, *cp = “goofy”;
int j = 20;
vp = &ch;
printf(“%c”, *(char *)vp);
vp = &j;
printf(“%d”,*(int *)vp);
vp = cp;
printf(“%s”,(char *)vp + 3);
}
Answer:
g20fy
88. main ( )
{
static char *s[ ] = {“black”, “white”, “yellow”, “violet”};
char **ptr[ ] = {s+3, s+2, s+1, s}, ***p;
p = ptr;
**++p;
printf(“%s”,*--*++p + 3);
}
Answer:
17
ck