# 2.6 Exercise

1. (Multiple correct answers) Which of the following statements will cause compile error "invalid lvalue in assignment"?
1. `i + j = 100;`
2. `i = i + j; `
3. `i + j + (i++) = 100;`
4. `j = i = j + i`

ANS : 1, 3

2. What is the output of the following code?

#include<stdio.h>

int main() {
    int i = 0, j = 0;
    j = i = 1;
    printf("%d", i++);
    printf("%d", i);
    printf("%d", j = ++i);
    return 0;
}

1. 123
2. 234
3. 012
4. 122

ANS : 1

3. (Multiple correct answers) Which of the following statements have side effect?

1. `j += 100;`
2. `i + j; `
3. `++i + 100;`
4. `i + j++;`

ANS: 1, 3, 4