求助，一到嵌套就不行了

#include<stdio.h>
int n;
void f(int* num){
    int ns[100],i,pows[100],j=0,z=0;
    for(i = 0;num>0;num/=2,i++) ns[i] = num%2;
    for(;i>=0;i--){
        if(ns[i] == 1) {pows[j] = i;j++;}
    }
    for(;z<j;z++){
        if(pows[z]>2){
            printf("2(");
            f(pows[z]);
            printf(')');
        }
        else printf("2(%d)",pows[z]);
        if(z!=j-1) printf("+");
    }
    return;
    
}
int main(){
    scanf("%d",&n);
    f(n);
    return 0;
}