c - 在 C 中将结构传递给单独的函数时遇到问题
问题描述
我在将结构传递给新函数时遇到问题。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让代码检查结构中的所有名称字段并在找到结果后返回信息。代码工作正常，直到我尝试将结构传递给“searchDroneName”函数。主要显示我已经正确保存了相关信息，并且我对“searchDroneName”功能做了完全相同的事情。但是当我在“searchDroneName”函数中打印出结构的保存信息时，它会打印出一堆随机数和奇怪的字符。
我确定这只是我对功能以及如何传递信息缺乏了解，但感谢您的帮助，谢谢。
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;
}
解决方案
改变
int searchDroneName(int no_of_drones){
drone_info droneinfo[10];
至
int searchDroneName(drone_info *droneinfo, int no_of_drones){
和
case 2:
//Search Drone function
searchDroneName(no_of_drones);
至
case 2:
//Search Drone function
searchDroneName(droneinfo, no_of_drones);