列出歌曲信息的程序

Question

#define TAM_NAME 50    
#define TAM_VECTOR 50

struct song {

  char title[TAM_NAME];   
  char artist[TAM_NAME];
    };

void list_all_songs();

void print_song(struct song * m)
void le_input(char * temp);


struct song vec_songs[TAM_VECTOR];  
int num_songs=0;            
char song_file[] = "songs.txt";

int main() {
    char op;
    do {
        printf("Choose an option among the possibilities:\n");
        printf(" [1]List song\n");
        printf(" [2]Insert new song\n");
        printf(" [L]eave\n");
        fflush(stdin);
        scanf("%c", &op);
        switch (op) {
            case '1':
                printf("\nmenu 1\n");
                list_all_songs();
                break;
            case '2':
                printf("\nmenu 2\n");
                read_new_song(&vec_songs[num_songs]);
               num_songs++; 
                break;
            case 'l':
            case 'L':
                break;
            default:
                //system("cls"); 
                printf("Invalid Option!!!\n");
        }
        if (op!='l' && op!='L') {
            printf("\n\npress any key to return to the menu...\n");
            getchar();
        }
    }  while (op!='l' && op!='L');

    return 0;
}

直到这里还可以，但是接下来的几行我甚至是最简单的问题

void print_song(struct song * m) {
/*
    * TO DO - this function must print the song from the structure- title     + artist
    */
}

void le_input(char * time){
char input[TAM_NAME];
    /*
    * TO DO - this function must read a string written by the user and store it in time
    */
}    

void list_all_songs()
{
  /*
    * TO DO - this function must scroll through the song vector and print     its song information
    */

}

我相信从这里开始一切都很好，所以我将删除其余的代码。我只需要那3个帮助之一