C
Questions
Note : All the programs are
tested under Turbo C/C++ compilers.
It is assumed that,
Ø Programs run under DOS environment,
Ø The underlying machine is an x86 system,
Ø Program is compiled using Turbo C/C++ compiler.
The program output may depend on the information based on this
assumptions (for example sizeof(int) == 2 may be assumed).
Predict the
output or error(s) for the following:
51. 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);
}
52. main()
{
int i, n;
char *x = “girl”;
n = strlen(x);
*x = x[n];
for(i=0; i<n; ++i)
{
printf(“%s\n”,x);
x++;
}
}
53. int
i,j;
for(i=0;i<=10;i++)
{
j+=5;
assert(i<5);
}
54. main()
{
int i=-1;
+i;
printf("i = %d, +i = %d
\n",i,+i);
}
55. What
are the files which are automatically opened when a C file is executed?
56. what
will be the position of the file marker?
a: fseek(ptr,0,SEEK_SET);
b: fseek(ptr,0,SEEK_CUR);
57. main()
{
char name[10],s[12];
scanf("
\"%[^\"]\"",s);
}
How scanf will execute?
58. What
is the problem with the following code segment?
while ((fgets(receiving
array,50,file_ptr)) != EOF)
59. main()
{
main();
}
60. main()
{
char *cptr,c;
void *vptr,v;
c=10; v=0;
cptr=&c; vptr=&v;
printf("%c%v",c,v);
}
61. main()
{
char *str1="abcd";
char str2[]="abcd";
printf("%d %d
%d",sizeof(str1),sizeof(str2),sizeof("abcd"));
}
62. main()
{
char not;
not=!2;
printf("%d",not);
}
63. #define
FALSE -1
#define TRUE 1
#define NULL 0
main() {
if(NULL)
puts("NULL");
else if(FALSE)
puts("TRUE");
else
puts("FALSE");
}
64. main()
{
int k=1;
printf("%d==1 is
""%s",k,k==1?"TRUE":"FALSE");
}
65. 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");
}
66. #define
max 5
#define int arr1[max]
main()
{
typedef char arr2[max];
arr1 list={0,1,2,3,4};
arr2 name="name";
printf("%d %s",list[0],name);
}
67. int
i=10;
main()
{
extern int i;
{
int i=20;
{
const volatile unsigned i=30;
printf("%d",i);
}
printf("%d",i);
}
printf("%d",i);
}
68. main()
{
int *j;
{
int i=10;
j=&i;
}
printf("%d",*j);
}
69. main()
{
int i=-1;
-i;
printf("i = %d, -i = %d
\n",i,-i);
}
70. #include<stdio.h>
main()
{
const int i=4;
float j;
j = ++i;
printf("%d %f", i,++j);
}
71. #include<stdio.h>
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);
}
72. #include<stdio.h>
main()
{
register i=5;
char j[]= "hello";
printf("%s %d",j,i);
}
73. main()
{
int i=5,j=6,z;
printf("%d",i+++j);
}
74. struct
aaa{
struct aaa *prev;
int i;
struct aaa *next;
};
main()
{
struct aaa abc,def,ghi,jkl;
int x=100;
abc.i=0;abc.prev=&jkl;
abc.next=&def;
def.i=1;def.prev=&abc;def.next=&ghi;
ghi.i=2;ghi.prev=&def;
ghi.next=&jkl;
jkl.i=3;jkl.prev=&ghi;jkl.next=&abc;
x=abc.next->next->prev->next->i;
printf("%d",x);
}
75. struct
point
{
int x;
int y;
};
struct
point origin,*pp;
main()
{
pp=&origin;
printf("origin
is(%d%d)\n",(*pp).x,(*pp).y);
printf("origin
is (%d%d)\n",pp->x,pp->y);
}
76. main()
{
int i=_l_abc(10);
printf("%d\n",--i);
}
int
_l_abc(int i)
{
return(i++);
}
77. main()
{
char *p;
int *q;
long *r;
p=q=r=0;
p++;
q++;
r++;
printf("%p...%p...%p",p,q,r);
}
78. main()
{
char c=' ',x,convert(z);
getc(c);
if((c>='a') && (c<='z'))
x=convert(c);
printf("%c",x);
}
convert(z)
{
return z-32;
}
79. main(int
argc, char **argv)
{
printf("enter the character");
getchar();
sum(argv[1],argv[2]);
}
sum(num1,num2)
int
num1,num2;
{
return num1+num2;
}
80. #
include <stdio.h>
int
one_d[]={1,2,3};
main()
{
int *ptr;
ptr=one_d;
ptr+=3;
printf("%d",*ptr);
}
81. #
include<stdio.h>
aaa()
{
printf("hi");
}
bbb(){
printf("hello");
}
ccc(){
printf("bye");
}
main()
{
int (*ptr[3])();
ptr[0]=aaa;
ptr[1]=bbb;
ptr[2]=ccc;
ptr[2]();
}
82. #include<stdio.h>
main()
{
FILE
*ptr;
char
i;
ptr=fopen("zzz.c","r");
while((i=fgetch(ptr))!=EOF)
printf("%c",i);
}
83. main()
{
int i =0;j=0;
if(i && j++)
printf("%d..%d",i++,j);
printf("%d..%d,i,j);
}
84. main()
{
int i;
i = abc();
printf("%d",i);
}
abc()
{
_AX = 1000;
}
85. 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
86. main()
{
int a= 0;int b = 20;char x =1;char y =10;
if(a,b,x,y)
printf("hello");
}
87. main()
{
unsigned int i;
for(i=1;i>-2;i--)
printf("c
aptitude");
}
88. In
the following pgm add a stmt in the
function fun such that the address of
'a'
gets stored in 'j'.
main(){
int * j;
void fun(int **);
fun(&j);
}
void fun(int **k) {
int a =0;
/* add a stmt here*/
}
89. 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*/
}
90. main()
{
char
*p;
p="%d\n";
p++;
p++;
printf(p-2,300);
}
91. main(){
char a[100];
a[0]='a';a[1]]='b';a[2]='c';a[4]='d';
abc(a);
}
abc(char
a[]){
a++;
printf("%c",*a);
a++;
printf("%c",*a);
}
92. func(a,b)
int
a,b;
{
return( a= (a==b) );
}
main()
{
int
process(),func();
printf("The
value of process is %d !\n ",process(func,3,6));
}
process(pf,val1,val2)
int
(*pf) ();
int
val1,val2;
{
return((*pf)
(val1,val2));
}
93. void main()
{
static int i=5;
if(--i){
main();
printf("%d
",i);
}
}
94. void main()
{
int
k=ret(sizeof(float));
printf("\n
here value is %d",++k);
}
int ret(int ret)
{
ret += 2.5;
return(ret);
}
95. void main()
{
char
a[]="12345\0";
int i=strlen(a);
printf("here
in 3 %d\n",++i);
}
96. void main()
{
unsigned giveit=-1;
int gotit;
printf("%u
",++giveit);
printf("%u
\n",gotit=--giveit);
}
97. void main()
{
int i;
char
a[]="\0";
if(printf("%s\n",a))
printf("Ok
here \n");
else
printf("Forget
it\n");
}
98. void main()
{
void *v;
int integer=2;
int
*i=&integer;
v=i;
printf("%d",(int*)*v);
}
99. void main()
{
int
i=i++,j=j++,k=k++;
printf(“%d%d%d”,i,j,k);
}
100.
void main()
{
static int i=i++,
j=j++, k=k++;
printf(“i = %d j = %d k = %d”, i, j, k);
}
Answers for the above are listed in: C Aptitude - II( Answers and Explanations)
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