Consider the given code:

#include <stdio.h>

int main()
{
	int a = 10;
	if(a==10);
	{
		printf("True\n");
	}
	else
	{
		printf("False\n");
	}

	return 0;
}

Output

prog.c: In function 'main':
prog.c:8:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
     if(a==10);
     ^~
prog.c:9:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
     {
     ^
prog.c:12:5: error: 'else' without a previous 'if'
     else
     ^~~~

How to fix?

See the statement, if(a==10);

Here, if statement is terminated by semicolon (;). Thus, Error: 'else' without a previous 'if' in C is occurred.

To fix the error remove the semicolon (;) after the if statement.

Correct code:

#include <stdio.h>

int main()
{
	int a = 10;
	if(a==10)
	{
		printf("True\n");
	}
	else
	{
		printf("False\n");
	}

	return 0;
}

Output

True