Invalid Syntax in Control Statements

syntax

error: expected expression before ')' token

Description

Incorrect syntax in control statements like if, for, while, or switch.

Common Causes

• Missing or extra parentheses in conditions
• Using assignment (=) instead of comparison (==) in conditions
• Missing components in for loop declarations

Example of Error

Error Code

int main() {
    int i;
    for (i = 0; i < 10; ) {
        printf("%d\n", i);
    }
    return 0;
}

Solution

Correct the syntax of the control statement.

Corrected Code

int main() {
    int i;
    for (i = 0; i < 10; i++) {
        printf("%d\n", i);
    }
    return 0;
}

Additional Tips

• For loops require three components: initialization, condition, and increment
• While loops require a condition
• If statements require a condition in parentheses