C Programming - Control Instructions - Discussion

@All.

According to me, it is;

#include<stdio.h>
int main()
{
int x = 10, y = 100%90, i;
/* (i) Intialize x with the value of 10
(ii) Intialize y with the value of 10 [ 100%90 = 10 (% returns remainder)]
(iii) declare i
for(i=1; i<10; i++)
/* There is no relation between for loop and if condition */
if(x != y);
/* (i) [ 10 !=10 ] , the condition is false but
(ii) ";" (semicolon) has terminated the statement and moves to next statement.. */
printf("x = %d y = %d\n", x, y);
/* (i) x, y is assigned the value 10 which has been initialized earlier */
return 0;
}

1. The statement 1 is wrong bcz printf is not inside for loop so printf is called 1 times.

2. Since x = 10 anad y = 10. the value is printed.which is true.

3. We can terminate conditional statement with semicolon, hence if(x!=y); is allowed in c.

4. Since the program is producing o/p, the 4th statement is wrong.

Thank you, for explaining this program.

When this statement executes why = 100% 90 the why value become 10, the loop continue 9 times and the value of if either true or false it's no matter because there is a semicolon after that that means the if end there then it comes to the printf statement and print the x value as 10 and why value as 10; so option B is the correct answer. I agree but how print output 2, 3 please explain someone.

Good explanation @Kavya.

@Sujan.

In above program we have one for loop is [for(i=1; i<10; i++)], In this for loop 'i' value conditioned as 'i<10'.

If, that 'i' value is using in 'printf' then only we have choice to print that 'i' value. Only 'x' and 'y' values written in printf statement, so we are simply printing x and y values as 10 and 10 respectively.

if(x != y);

printf("x = %d y = %d\n", x, y);

In above two statements if statement is closed with ';' means it will create one anonymous block (shown below) and that if statement is not related to printf statement. We have to treat that Printf statement as independent.

if(x != y); turboc compiler understand this if statement as,

if(x != y)
{

};

So the if statement doesn't have any body part simply it is empty block.

Program successfully compile and execute.

It produce output: x = 10; y = 10 for 9 times.

@Kavya.

Your explanation is clear and useful. Thank you.

Explain it, please.

Thank you, @Prasanth.