Error: expected ';' before '{' token [on hold]

When I try to compile it gives me this and I really don't know how to solve this problem.

#include <stdio.h>

int main()
{
    float num;
    printf("Insert a number: \n");
    scanf("%f", &num);

    if (num>0){
    printf("%f is positive", num);
    }

    else (num<0){                    //The error is here
    printf("%f is negative", num);
    }
 }