求和为某数的全部组合

在给定数字范围内，求和为某数的全部组合

#include <stdio.h>

struct Zhan{
    int n;
    int content[100];
};

ruZhan(struct Zhan* zhan, int x){
    (*zhan).content[(*zhan).n] = x;
    (*zhan).n++;
}

czZhan(struct Zhan* zhan, int n){
    (*zhan).n = n;
}

printfZhan(struct Zhan* zhan){
    int i;
    for(i = 0; i < (*zhan).n; i++){
        printf("%d ", (*zhan).content[i]);
    }
    printf("\n");
}

int find(int e, int x, struct Zhan* zhan){
    int n;
    n = (*zhan).n;

    if(e <= 0) return 0;
    if(x - e > 0){
        ruZhan(zhan, e);
        find(e - 1, x - e, zhan);
    }
    else if(x - e < 0) ;
    else if(x - e == 0){
        ruZhan(zhan, e);
        printfZhan(zhan);
    }
    czZhan(zhan, n);

    find(e - 1, x, zhan);

}

main(){
    struct Zhan zhan;
    zhan.n = 0;
    find(100, 41, &zhan);
    printfZhan(&zhan);
}