问题描述
将结构传递给新函数时遇到麻烦.我当前的代码打开一个文本文件，将相关信息保存到结构中并打印保存的信息.现在，我正在尝试编写一个函数，该函数将要求用户输入名称，并要求代码检查结构中的所有名称字段并在找到结果后返回inforamtion.在我尝试将结构传递给"searchDroneName"函数之前，代码工作正常.主要显示我已经正确保存了相关信息，并且对"searchDroneName"函数做了完全相同的操作.但是，当我在"searchDroneName"函数中打印出结构的已保存信息时，它将打印出一堆随机数和奇怪的字符.
I'm having trouble passing my struct to a new function. My current code opens a text file, saves the relevant information to the structure and prints the saved information. Now I'm trying to write a function that will ask the user to input a name and for the code to check all name fields in the struct and return inforamtion once found a result. The code works fine until I try pass the struct to the "searchDroneName" function. The main shows that I have saved the relevant information properly and I did the exact same for the "searchDroneName" function. But when I print out the saved information of the struct in the "searchDroneName" function it prints out a bunch of random numbers and weird characters.
我敢肯定，这只是我对功能以及如何传递信息缺乏了解，但是感谢您的帮助.
I'm sure it's just my lack of understanding of functions and how to pass information but and help is appreciated, thanks.
这是代码:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define DRONE_COUNT 10
typedef struct{
int drone_number;
char drone_name[20];
int year_manufactured;
double mass;
double top_speed;
double max_distance;
double load_capacity;
} drone_info;
int searchDroneName(int no_of_drones){
drone_info droneinfo[10];
int i, found, numdrones;
char namechoice[20];
numdrones = no_of_drones;
// Test Data
printf("Data:\n\n");
for (i=0; i < numdrones; i++){
printf("ID: %d Name: %s Year: %d Mass: %.2f Top Speed: %.2f Max Distance: %.2f Load Capacity: %.2f\n",
droneinfo[i].drone_number, droneinfo[i].drone_name, droneinfo[i].year_manufactured, droneinfo[i].mass, droneinfo[i].top_speed, droneinfo[i].max_distance, droneinfo[i].load_capacity);
}
printf("Input Drone Name: ");
scanf("%19s", namechoice);
found = 0;
for (i=0; i < numdrones; ++i){
printf("Drone Name: %s\n", droneinfo[i].drone_name);
if (!strcmp(namechoice, droneinfo[i].drone_name)){
printf("FOUND A MATCH");
found = 1;
}
}
if(found == 0){
printf("No Matches Were Found!\n");
}
return 0;
}
int main(void) {
drone_info droneinfo[10];
int choice, droneID, yrman, i, no_of_drones;
float dronemass, dronemaxdist, dronetopspd, droneload;
char dronename[20];
i = 0;
FILE* inputfile = fopen("drone.txt", "r");
if(inputfile == NULL)
{
perror("ERROR! ");
exit(-1);
}
//GAY CODE BELLOW
while(fscanf(inputfile, "%d %19s %d %f %f %f %f", &droneID, dronename, &yrman, &dronemass, &dronetopspd, &dronemaxdist, &droneload)==7){
if(ferror(inputfile)){
perror("An error occurred: ");
}
droneinfo[i].drone_number = droneID;
strcpy(droneinfo[i].drone_name, dronename);
droneinfo[i].year_manufactured = yrman;
droneinfo[i].mass = dronemass;
droneinfo[i].top_speed = dronetopspd;
droneinfo[i].max_distance = dronemaxdist;
droneinfo[i].load_capacity = droneload;
i++;
}
no_of_drones = i;
fclose(inputfile);
printf("Data:\n\n");
for (i=0; i < no_of_drones; i++){
printf("ID: %d Name: %s Year: %d Mass: %.2f Top Speed: %.2f Max Distance: %.2f Load Capacity: %.2f\n",
droneinfo[i].drone_number, droneinfo[i].drone_name, droneinfo[i].year_manufactured, droneinfo[i].mass, droneinfo[i].top_speed, droneinfo[i].max_distance, droneinfo[i].load_capacity);
}
//GAY CODE ABOVE
do{
printf("Please select an option:\n\n");
printf("1. Input/update drone information\n");
printf("2. Search a drone\n");
printf("3. Simulate a drone delivery scenario\n");
printf("4. Display simulation results\n");
printf("5. Save drone information\n");
printf("6. Save all results\n");
printf("7. Exit\n\n");
scanf("%d", &choice);
switch(choice)
{
case 1:
//Input Drone Function
break;
case 2:
//Search Drone function
searchDroneName(no_of_drones);
break;
case 3:
//Simulate Drone function
break;
case 4:
//Display simulation results function
break;
case 5:
//Save drone information function
break;
case 6:
//Save all results function
break;
case 7:
// Exit, Breaks loop
break;
default:
printf("\nInvalid choice! Please enter a number inbetween 1 and 7!\n\n" );
break;
}
} while (choice != 7);
return 0;
}
推荐答案
更改
int searchDroneName(int no_of_drones){drone_info droneinfo [10];
到
int searchDroneName(drone_info * droneinfo，int no_of_drones){
和
case 2:
//Search Drone function
searchDroneName(no_of_drones);
到
case 2:
//Search Drone function
searchDroneName(droneinfo, no_of_drones);
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