Question

In the first program below there is no error.But for the second program there is an error.
Why is that so?

First program:

#include<stdio.h>
void main()
{
int k=8;
int m=7;
k<m?k=k+1:m+1;
printf("%d",k);
}

Second program:

#include<stdio.h>
void main()
{
int k=8;
int m=7;
k<m?k=k+1:m=m+1;
printf("%d",k);
}

Answer 1

The conditional operator has higher precedence than the assignment operator. You need extra parentheses to have the desired precedence.

k < m? k = k + 1 : m = m + 1;

is evaluated as

((k < m) ? (k = k + 1) : m) = m + 1;

Add parentheses to have the correct precedence:

(k < m) ? (k = k + 1) : (m = m + 1);