我正在尝试构建一个简单的函数,它将接收一个数据文件,并将数据文件中的各种值分配给一个全局结构数组。但是,我无法让它正常工作。我已经编写了我认为大部分需要的代码,但我的测试行 printf("time is %d\n", BP[i].time);
只是读出“Time is 0。” 10 次,让我相信这些值并没有像我想象的那样分配给结构数组。
我该如何继续?
示例数据文件 (.txt):
0001 553 200
0002 552 100
.... ... ...
当前代码:
#include <stdio.h>
#include <stdlib.h>
// Function Prototype
void readFileBP(char fileName[1000]);
// Definition of BP Structure
struct bloodPressure
{
int *time;
int *sys;
int *dia;
}BP[50]; // end struct BP
int main()
{
char fileName[1000] = "C:\\Users\\User\\Desktop\\DataFiles\\BP_1.txt";
readFileBP(fileName);
int i = 0;
for (i; i<10; i++)
{
printf("Time is %d\n", BP[i].time);
}
} // end int main()
void readFileBP(char fileName[1000])
{
FILE *filePtr; // declare file pointer
int time;
int sys;
int dia;
int position = 0;
if (filePtr = fopen(fileName, "r") == NULL) // error check opening file
{
printf("Opening file failed. Please reenter filename.");
exit(1);
} // end if
while (fscanf(filePtr, "%d, %d, %d", &time, &sys, &dia) != EOF) // read in BP values
{
BP[position].time = time;
BP[position].sys = sys;
BP[position].dia = dia;
position++;
} // end while
fclose(filePtr);
} // end void readFile()
最佳答案
编译时启用警告。你应该得到这样的东西:
gsamaras@gsamaras-A15:~$ gcc -Wall -o px px.c
px.c: In function ‘main’:
px.c:22:5: warning: statement with no effect [-Wunused-value]
for (i; i<10; i++)
^
px.c:24:9: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘int *’ [-Wformat=]
printf("Time is %d\n", BP[i].time);
^
px.c: In function ‘readFileBP’:
px.c:37:17: warning: assignment makes pointer from integer without a cast [enabled by default]
if (filePtr = fopen(fileName, "r") == NULL) // error check opening file
^
px.c:37:5: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
if (filePtr = fopen(fileName, "r") == NULL) // error check opening file
^
px.c:45:27: warning: assignment makes pointer from integer without a cast [enabled by default]
BP[position].time = time;
^
px.c:46:26: warning: assignment makes pointer from integer without a cast [enabled by default]
BP[position].sys = sys;
^
px.c:47:26: warning: assignment makes pointer from integer without a cast [enabled by default]
BP[position].dia = dia;
^
px.c: In function ‘main’:
px.c:26:1: warning: control reaches end of non-void function [-Wreturn-type]
} // end int main()
^
这还不足以让您入门吗?这是给我的! :)
关于c - 从文件中读取数据到结构体数组 (C),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/36694259/