c aptitude question with answer volume 3
70. find equivalent *(*(s+x)+y) ==> s[x][y]
Answer : content of s[x][y]
71.
int num[5];
num[5]=;
The 5 in the first and the second statements denotes ?
The 5 in the first and the second statements denotes ?
CONDITIONAL AND LOOPING STATEMENTS
72. main()
{
float me = 1.1;
double you = 1.1;
if(me==you)
printf("I love SWEETS");
else
printf("I hate MEDICINES");
}
Answer:
I hate MEDICINES
Explanation:
For floating point numbers (float, double, long double) the values cannot be predicted exactly. Depending on the number of bytes, the precession with of the value represented varies. Float takes 4 bytes and long double takes 10 bytes. So float stores 0.9 with less precision than long double.
Rule of Thumb:
Never compare or at-least be cautious when using floating point numbers with relational operators (== , >, <, <=, >=,!= ) .
73. main()
{
int i=0;
for(;i++;printf("%d",i)) ;
printf("%d",i);
}
Answer:
1
Explanation:
before entering into the for loop the checking condition is "evaluated". Here it evaluates to 0 (false) and comes out of the loop, and i is incremented (note the semicolon after the for loop).
74. main()
{
int i = 3;
for (;i++=0;) printf(“%d”,i);
}
Answer:
Compiler Error: Lvalue required.
Explanation:
As we know that increment operators return rvalues and hence it cannot appear on the left hand side of an assignment operation.
75. 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
Explanation: An ordinary program to check if leap year or not.
76. main()
{
int a= 0;int b = 20;char x =1;char y =10;
if(a,b,x,y)
printf("hello");
}
Answer:
hello
Explanation:
The comma operator has associativity from left to right. Only the rightmost value is returned and the other values are evaluated and ignored. Thus the value of last variable y is returned to check in if. Since it is a non zero value if becomes true so, "hello" will be printed.
77. void main()
{
while(1){
if(printf("%d",printf("%d")))
break;
else
continue;
}
}
Answer:
Garbage values
Explanation:
The inner printf executes first to print some garbage value. The printf returns no of characters printed and this value also cannot be predicted. Still the outer printf prints something and so returns a non-zero value. So it encounters the break statement and comes out of the while statement.
78. #include<conio.h>
main()
{
int x,y=2,z,a;
if(x=y%2) z=2;
a=2;
printf("%d %d ",z,x);
}
Answer:
Garbage-value 0
Explanation:
The value of y%2 is 0. This value is assigned to x. The condition reduces to if (x) or in other words if(0) and so z goes uninitialized.
Thumb Rule: Check all control paths to write bug free code.
79. main()
{
int i=10,j=20;
j = i, j?(i,j)?i:j:j;
printf("%d %d",i,j);
}
Answer:
10 10
Explanation:
The Ternary operator ( ? : ) is equivalent for if-then-else statement. So the question can be written as:
if(i,j)
{
if(i,j)
j = i;
else
j = j;
}
else
j = j;
80. main()
{
int i = 3;
for (;i++=0;) printf(“%d”,i);
}
Answer:
Compiler Error: Lvalue required.
Explanation:
As we know that increment operators return rvalues and hence it cannot appear on the left hand side of an assignment operation.
81. Find the output for the following C program
main()
{
i=20,k=0;
for(j=1;j<i;j=1+4*(i/j))
{
i=20,k=0;
for(j=1;j<i;j=1+4*(i/j))
{
k+=j<10?4:3;
}
printf("%d", k);
}
printf("%d", k);
}
Answer . k=4
Answer . k=4
82. Find the output for the following C program
int i =10
int i =10
main()
{
{
int i =20,n;
for(n=0;n<=i; )
{
for(n=0;n<=i; )
{
int i=10;
i++;
}
printf("%d", i);
i++;
}
printf("%d", i);
}
Answer :. i=20
Answer :. i=20
83.Find the output for the following C program
main()
{
int Y=10;
if( Y++>9 && Y++!=10 && Y++>10)
int Y=10;
if( Y++>9 && Y++!=10 && Y++>10)
printf("%d", Y);
else
printf("%d", Y);
else
printf("%d", Y);
}
Answer : 13
Answer : 13
84. Input a,b
s=0;
c=a;
d=b;
while(d<>0)
{
s=s+c;
d=d-1;
}
Print s
for given values of a,b find the output
5questions for different values of a,b
85.if((2a+b)<100)...... 5 ques were given with different values of a and b.
86. print '*' like this
*
***
*****
*******
n times
87. Find the output
main()
{
int r;
if(r==5!==4)
printf("inside");
else
printf("outside");
printf("%d",r);
}
Answer :
88. Find the output
for(i==0,j==0;i<10,j<10;i++,j+);
printf("%d",j);
(compilation error,run time error,0)
Answer :
89. What will be the result of the following program?
main()
{
char p[]="String";
int x=0;
if(p=="String")
{
printf("Pass 1");
if(p[sizeof(p)-2]=='g')
printf("Pass 2");
else
printf("Fail 2");
}
else
{
printf("Fail 1");
if(p[sizeof(p)-2]=='g')
else
printf("Fail 2");
}
}
a) Pass 1, Pass 2
b) Fail 1, Fail 2
c) Pass 1, Fail 2
d) Fail 1, Pass 2
e) syntax error during compilation
Answer :
90. What is the ouptut in the following program
main()
{
char c=-64;
int i=-32
unsigned int u =-16;
if(c>i)
{
printf("pass1,");
if(c<u)
printf("pass2");
else
printf("Fail2");
}
else
printf("Fail1);
if(i<u)
printf("pass2");
else
printf("Fail2")
}
a) Pass1,Pass2
b) Pass1,Fail2
c) Fail1,Pass2
e) None of these
Answer : (c)
91. main()
{
int l, b, con;
l=b=2;
con= (b==l) ? 1 : 0;
printf("%d",con);
}
what will be the value of con?
Answer :
92. main program:
i=foo(2) foo(int s)
{
if(!s)
return s;
else
{ int i=5; return i}
}
Answer : 5
93. Find the output
main()
{
int k=0 i=0j=1;
if(i0)&&(k=2) printf(k);
if(i0|| k=0)
printf(k);
}
Answer : 2 2
94.Find the output:
main()
{
char ch;
int count=0;
while((ch = getch() != '\n')
{
while (ch == ' ')
ch = getch();
while((ch!=' ') && (ch!='.'))
{
count++;
ch=getch();
}
}
Answer : 11
95. What is the final value of i and how many times loop is
Executed ?
#include<stdio.h>
main()
{
int i,j,k,l,lc=0;
/* the input is given as 1234 567 */
printf("Enter the number string:<1234 567 >\n");
scanf("%2d%d%1d",&i,&j,&k);
for(;k;k--,i++)
for(l=0;l> printf("%d %d\n",i,l);)
printf("LOOPS= %d\n", lc-1);
}
Answer : ( i = 17, and loop is executed for 169 times)
96. Find the output
#include<stdio.h>
main()
{
int i;
for (i=1;i<100; i++)
printf("%d %0x\n",i,i);
}
Answer: i is from 1 to 99 for the first format,
for the second format 1to9, ato f, 10 to 19,1ato1f, 20 to 29, etc
97. C program code
int zap(int n)
{
if(n<=1)then zap=1;
else zap=zap(n-3)+zap(n-1);
}
then the call zap(6) gives the values of zap
[a] 8 [b] 9 [c] 6 [d] 12 [e] 15
Answer : b
OPERATORS:
98. main()
{
int i=10;
i=!i>14;
printf ("i=%d",i);
}
Answer:
i=0
Explanation:
In the expression !i>14 , NOT (!) operator has more precedence than ‘ >’ symbol. ! is a unary logical operator. !i (!10) is 0 (not of true is false). 0>14 is false (zero).
99. main()
{
int i=-1;
+i;
printf("i = %d, +i = %d \n",i,+i);
}
Answer:
i = -1, +i = -1
Explanation:
Unary + is the only dummy operator in C. Where-ever it comes you can just ignore it just because it has no effect in the expressions (hence the name dummy operator).
100. main()
{
int i=-1;
-i;
printf("i = %d, -i = %d \n",i,-i);
}
Answer:
i = -1, -i = 1
Explanation:
-i is executed and this execution doesn't affect the value of i. In printf first you just print the value of i. After that the value of the expression -i = -(-1) is printed.
101. main()
{
int i=0;
while(+(+i--)!=0)
i- =i++;
printf("%d",i);
}
Answer: -1
Explanation:
Unary + is the only dummy operator in C. So it has no effect on the expression and now the while loop is, while(i--!=0) which is false and so breaks out of while loop. The value –1 is printed due to the post-decrement operator.
102. Comment:
int a ,b=7
a=b<4?b<<1:b>4?7>>1:a
Answer.3
103. What is the value assigned to the variable a if b is 7
a=b>8?b<<2:b>4?b>>1:b;
Answer : 3
104. the value of the following expr (2^3)+(a^a) is
a) 1 b)2 c) 3 d) insufficient data
Answer :
a) do the same function
b) differ : > overwrites, while >> appends
c) differ : > is used for input while >> is used for output
d) differ : > write to any file while >> write only to standard output
e) None of these
Answer : b
106. In C, x-=y+1 how will u represent it..
a. x=x+y+1 b. -x-y-1 c. -x+y+1
Answer :
107.Comment
(7^2)^3 and 7^2^3. What is the relation between the 2 . ie >,<,=
Answer : (7^2)^3<7^2^3.
108.Find the output
main()
{
int x=5;
printf("%d %d %d\n",x,x<<2,x>>2);
}
{
int x=5;
printf("%d %d %d\n",x,x<<2,x>>2);
}
Answer :
109. What will be the output of the following code?
int i=7. ,
A)49 8)56 C)64
Answer :
110. The statement 17 + (21 -6) * 2 returns
A)47.0
8)64
C)47
Answer :
INT, CHAR & STRINGS (INCLUDING PRINTF)
111. What is th output of the following program?
int x= 0x65;
main()
{
char x;
printf("%d\n",x)
}
int x= 0x65;
main()
{
char x;
printf("%d\n",x)
}
a) compilation error b) 'A' c) 65 d) unidentified
Answer : d
112. What is the output of the following program
main()
{
int a=10;
int b=6;
if(a=3)
b++;
printf("%d %d\n",a,b++);
}
a) 10,6 b)10,7 c) 3,6 d) 3,7 e) none
Answer : d) 3,7
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