Control Flow in C - Placement questions

Control Flow in C - Placement questions

1. Which is the correct statement?

a) Printf(“Maximum = %d\n”, (x.y) ? x : y);
b) Printf( “%s\n”, (mark >= 60) ? “First class” : “Not first class” );
c) Printf(“%s\n”, PASS);
d) All of the above

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2. do-while loop terminates when conditional expression returns?

a) Zero
b) One
c) Non-zero
d) -1

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3. In the following loop construct, which one is executed only once always.

for ( exp1; exp2; exp3) {. . . }

a) exp1
b) exp3
c) exp1 and exp3
d) exp1, exp2 and exp3

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4. if default statement is omitted and there is no match with the case table

a) No statement within switch case will be executed
b) Syntax error is produced
c) Executes all the statements in the switch case construct
d) Executes the last case statement only

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5.

main()
{
int a = 2, b = 4, c = 8, x = 4;
if ( x == b) x = a; else x = b;
if( x != b) c = c + b; else c = c + a;
printf(“c = %d\n”,c);
}

What will be printed when the above code is executed?

a) C = 4
b) C = 8
c) C = 10
d) C = 12

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6.

main()
{
unsigned int x = -10; int y = 10;
If ( y <= x) printf( “He is good\n”);
If ( y == ( x = -10)) printf( “She is better\n”);
If (( int) x == y) printf(“it is the best\n”);
}
What will be the output of above sample code?
a) She is better
b) He is good it is the best
c) It is the best
d) He is good

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7.

main()
{
int x;
if ( x > 4) printf( “Brinda”);
else if ( x > 10) printf( “Karthik”);
else if ( x > 21 ) printf(“ Pradeep”);
else printf( “Sandeep”);
}

What will be the value of x so that “Karthik” will be printed?

a) From 10 to 21
b) From 11 to 21
c) Grater then 10
d) None

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8.

main()
{
int x = 0;
for (; ;)
{
if ( x++ == 4) break;
continue;
}
printf(“x = %d\n”, x);
}

What will be printed when the above code is executed?

a) X = 0
b) X = 1
c) X = 4
d) X = 5

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9. What is the output of the following code?

main()
{
int I = 0;
switch ( I )
{
case 0 : i++;
case 1 : i+++2
case2 : ++I;
}
printf(“%d”, i++);
}

a) 1
b) 3
c) 4
d) 5

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10.

main()
{
int ones, twos, threes, others;
int c;
Ones = twos = threes = others = 0;
while( ( c = getchar() != ‘\n’) )
{
switch( c )
{
case ‘1’ : ++ones;
case ‘2’ : ++twos;
case ‘3’ : ++threes;
break;
default: ++others;
break;
}
}
printf( “%d%d ”, ones, others);
}

If the input is “1a1b1c” what is the output?

a) 13
b) 34
c) 33
d) 31

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11. What will be the output of the following code?

main()
{
ch = ‘A’;
while (ch <= ‘F’)
{
switch(ch)
{
case’A’: case’B’:case’C’: case’D’: ch++;continue;
case ‘E’: case ‘F’: ch++;
}
putchar( ch );
}
}

a) ABCDEF
b) EFG
c) FG
d) Error

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12. What is the output of the following code?

main()
{
int I = 3;
while( I --)
{
int I = 100;
i- -;
printf(“%d. .”, i);
}
}

a) Infinite loop
b) Error
c) 99..99..99..
d) 3..2..1..

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13.

unsigned char c;
for( c = 0; c != 256; c+2 )
printf(“%d”, c);

Who many times the loop executes?

a) 127
b) 128
c) 256
d) Infinitely

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14.

What is the value of int variable result if x = 50, y = 75 and z = 100?
result = ( x + 50 ? y >=75 ? z > 100 ? 1 : 2 : 3 : 4);
a) 1
b) 2
c) 3
d) 4

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15.

main()
{
int a = -4, r, num = 1;
r = a % -3;
r = ( r ? 0 : num * num);
printf( “%d”, r);
}

What will be the output of the program?

a) 0
b) 1
c) –ve is not allowed in the mod operands
d) None

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16.

main()
{
unsigned int I = 10;
while( i- - >= 0);
}

How many times the loop will be executed?

a) 10
b) Zero times
c) One time
d) None

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17.

switch ( s )
{
case 1 : printf(“Balan”);
case 2:
case 3: printf( “Elango”);
case 4: printf( “Thiruvalluvan”);
default : printf(“Kamban”);
}

To print only Kamban, what will be the value of s?

a) 2
b) 1 or 3 or 4
c) Any int value other then 1,2,3 and 4
d) 4

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18. How many x are printed?

for( I = 0, j = 10; I < j; I ++, j --)
printf(“x”);

a) 10
b) 5
c) 4
d) None

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19. Identify the wrong statement where - - - - represent C code

a) lable : { - - - } - - - - goto lable;
b) goto end; - - -
end : { - - - }
c) goto 50; - - -
50: { - - -}
d) begin: { - - -}
If ( a < 10 ) goto begin;

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20. What will be the final values of I and j when the following code terminates?

main()
{
static int I , j = 5;
for ( I = 0; I < 3; I ++)
{
printf(“%d%d\n”, I, j);
if( j > 1){ j - -; main ();}
}
}

a) 02
b) 11
c) 21
d) Error, because main cannot be called recursively

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