# If Statement Quiz in C

If statement Quiz in C | The if-else statement in C is a selection statement. When dealing with selection statements, there are generally three versions: one-way, two-way, and multi-way.

One way decision statements do a particular thing or they do not. Two-way decision statements can do one thing or do another. Multi-way decision statements can do one of many different things depending on the value of an expression. Here you can find programs on if-else in C.

Note:- In C, 0 is false and non-zero value (both positive and negative) is true.

## If Statement Quiz

Now let us start solving the If statement Quiz in C programming language.

Q1) Find the output of the given C program.

``````#include<stdio.h>
int main()
{
if(0)
{
printf("x");
}
printf("y");
printf("z");
return 0;
}``````

a) xyz
b) Compile time error
c) yz
d) x

Ans:- c) yz

Q2) Find the output of the given C program.

``````#include<stdio.h>
int main()
{
int a;
a = 0, 1;
if(a)
{
printf("x");
printf("y");
}
printf("z");
return 0;
}``````

a) Compile time error
b) z
c) xy
d) xyz

Ans:- b) z

The comma operator evaluates to its rightmost operand. So, a=0 and condition become false.

Q3) Find the output of the given C program.

``````#include<stdio.h>
int main()
{
if("false")
{
printf("x");
printf("y");
}
printf("z");
return 0;
}``````

a) z
b) Compile time error
c) xy
d) xyz

Ans:- d) xyz

The “false” is a valid string so condition becomes true, and if block executed.

Q4) Find the output of the given C program.

``````#include<stdio.h>
int main()
{
if(5%5);
{
printf("x");
printf("y");
}
printf("z");
return 0;
}``````

a) z
b) xyz
c) xy
d) Compile time error

Ans:- b) xyz

Note that there is a semicolon after if(5%5), so if block completed. printf(“x”); and printf(“y”) is not the part of if block statement.

Q5) Find the output of the given C program.

``````#include<stdio.h>
int main()
{
if(0)
{
printf("x");
printf("y");
}
printf("z");
return 0;
}``````

a) z
b) xyz
c) Compile time error
d) xy

Ans:- a) z

Q6) Find the output of the given C program.

``````#include<stdio.h>
int main()
{
int a = 0, 1;
if(a)
{
printf("x");
printf("y");
}
printf("z");
return 0;
}``````

a) xy
b) Compile time error
c) xyz
d) z

Ans:- b) Compile time error

Compile-time error due to int a=0,1; Here invalid declaration of variable.

Q7) Find the output of the given C program.

``````#include<stdio.h>
int main()
{
if('a')
{
printf("x");
printf("y");
}
printf("z");
return 0;
}``````

a) xy
b) xyz
c) z
d) Compile time error

Ans:- b) xyz

ASCII value of ‘a’ is 97. So, the condition becomes true and display xy from the if block then from outside of if block z is displayed.

Q8) Find the output of the given C program.

``````#include<stdio.h>
int main()
{
if('a')
printf("x");
printf("y");
printf("z");
return 0;
}``````

a) xy
b) z
c) xyz
d) Compile time error

Ans:- c) xyz

Q9) Find the output of the given C program.

``````#include<stdio.h>
int main()
{
if()
{
printf("x");
printf("y");
}
printf("z");
return 0;
}``````

a) xyz
b) z
c) Compile time error
d) xy

Ans:- c) Compile time error

Compile-time error; In C language if is a conditional statement and without condition, it can’t be executed.

Q10) Find the output of the given C program.

``````#include<stdio.h>
int main()
{
int a;
a = (0, 1);
if(a)
{
printf("x");
printf("y");
}
printf("z");
return 0;
}``````

a) Compile time error
b) z
c) xy
d) xyz

Ans:- d) xyz

Here () is used in a = (0,1); so expressions evaluated from left to right, Hence a=1; The if condition becomes true and if block executed.

Q11) Find the output of the given C program.

``````#include<stdio.h>
int main()
{
if("")
{
printf("x");
printf("y");
}
printf("z");
return 0;
}``````

a) xy
b) z
c) xyz
d) Compile time error

Ans:- c) xyz

The empty string has a null character which value is other than zero so if statement becomes true.

Q12) Find the output of the given C program.

``````#include<stdio.h>
int main()
{
if(" ")
{
printf("x");
printf("y");
}
printf("z");
return 0;
}``````

a) xy
b) x
c) Compile time error
d) xyz

Ans:- d) xyz

The value of string blank space is not zero so the condition of if block becomes true and displayed xy from if block. After that z is displayed from outside from the if block.

Q13) Find the output of the given C program.

``````#include<stdio.h>
int main()
{
if(0)
printf("x");
printf("y");
printf("z");
return 0;
}``````

a) xyz
b) x
c) Compile time error
d) yz

Ans:- d) yz

Q14) Find the output of the given C program.

``````#include<stdio.h>
int main()
{
int a=0;
if(a++)
{
printf("x");
printf("y");
}
printf("z");
return 0;
}``````

a) z
b) Compile time error
c) xyz
d) xy

Ans:- a) z

Postfix increment operator so first value assigned and then increment. Hence condition becomes false.

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